Notebooks/Day15_Regular_Expressions_in_Python.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<a href=\"https://apssdc.in\"><img src=\"https://camo.githubusercontent.com/e7501c5948d48f88dad8ab2ab6bd448e1cfd6c79/68747470733a2f2f64726976652e676f6f676c652e636f6d2f75633f6578706f72743d646f776e6c6f61642669643d3135414b51365f2d42697857344b366d4c36525070684635454b58715946327a6a\" width=\"900\" align=\"center\"></a>\n",
    "\n",
    "<h1><center>Day 15 Regular Expressions in Python</center></h1>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Recap\n",
    "\n",
    "- Modules and Packages\n",
    "    - Builtin Packages/Modules\n",
    "        - math, random, calendar, os\n",
    "    - User Defined packages/ Modules\n",
    "    \n",
    "### Today Objectives\n",
    "\n",
    "- Regular Expressions (Regex)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "s = \"\"\"Python is an interpreted high-level general-purpose programming language. Python's design philosophy emphasizes code readability with its notable use of significant indentation. Wikipedia\n",
    "Developer: Python Software Foundation\n",
    "Stable release: 3.9.5 / 3 May 2021; 29 days ago\n",
    "Preview release: 3.10.0b1 / 3 May 2021; 29 days ago\n",
    "Typing discipline: Duck, dynamic, strong typing; gradual (since 3.5, but ignored in CPython)\n",
    "First appeared: February 1991; 30 years ago\n",
    "Paradigm: Multi-paradigm: object-oriented, procedural (imperative), functional, structured, reflective\"\"\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['P', 'y', 't', 'h', 'o', 'n', ' ', 'i', 's', ' ', 'a', 'n', ' ', 'i', 'n', 't', 'e', 'r', 'p', 'r', 'e', 't', 'e', 'd', ' ', 'h', 'i', 'g', 'h', '-', 'l', 'e', 'v', 'e', 'l', ' ', 'g', 'e', 'n', 'e', 'r', 'a', 'l', '-', 'p', 'u', 'r', 'p', 'o', 's', 'e', ' ', 'p', 'r', 'o', 'g', 'r', 'a', 'm', 'm', 'i', 'n', 'g', ' ', 'l', 'a', 'n', 'g', 'u', 'a', 'g', 'e', '.', ' ', 'P', 'y', 't', 'h', 'o', 'n', \"'\", 's', ' ', 'd', 'e', 's', 'i', 'g', 'n', ' ', 'p', 'h', 'i', 'l', 'o', 's', 'o', 'p', 'h', 'y', ' ', 'e', 'm', 'p', 'h', 'a', 's', 'i', 'z', 'e', 's', ' ', 'c', 'o', 'd', 'e', ' ', 'r', 'e', 'a', 'd', 'a', 'b', 'i', 'l', 'i', 't', 'y', ' ', 'w', 'i', 't', 'h', ' ', 'i', 't', 's', ' ', 'n', 'o', 't', 'a', 'b', 'l', 'e', ' ', 'u', 's', 'e', ' ', 'o', 'f', ' ', 's', 'i', 'g', 'n', 'i', 'f', 'i', 'c', 'a', 'n', 't', ' ', 'i', 'n', 'd', 'e', 'n', 't', 'a', 't', 'i', 'o', 'n', '.', ' ', 'W', 'i', 'k', 'i', 'p', 'e', 'd', 'i', 'a', '\\n', 'D', 'e', 'v', 'e', 'l', 'o', 'p', 'e', 'r', ':', ' ', 'P', 'y', 't', 'h', 'o', 'n', ' ', 'S', 'o', 'f', 't', 'w', 'a', 'r', 'e', ' ', 'F', 'o', 'u', 'n', 'd', 'a', 't', 'i', 'o', 'n', '\\n', 'S', 't', 'a', 'b', 'l', 'e', ' ', 'r', 'e', 'l', 'e', 'a', 's', 'e', ':', ' ', '3', '.', '9', '.', '5', ' ', '/', ' ', '3', ' ', 'M', 'a', 'y', ' ', '2', '0', '2', '1', ';', ' ', '2', '9', ' ', 'd', 'a', 'y', 's', ' ', 'a', 'g', 'o', '\\n', 'P', 'r', 'e', 'v', 'i', 'e', 'w', ' ', 'r', 'e', 'l', 'e', 'a', 's', 'e', ':', ' ', '3', '.', '1', '0', '.', '0', 'b', '1', ' ', '/', ' ', '3', ' ', 'M', 'a', 'y', ' ', '2', '0', '2', '1', ';', ' ', '2', '9', ' ', 'd', 'a', 'y', 's', ' ', 'a', 'g', 'o', '\\n', 'T', 'y', 'p', 'i', 'n', 'g', ' ', 'd', 'i', 's', 'c', 'i', 'p', 'l', 'i', 'n', 'e', ':', ' ', 'D', 'u', 'c', 'k', ',', ' ', 'd', 'y', 'n', 'a', 'm', 'i', 'c', ',', ' ', 's', 't', 'r', 'o', 'n', 'g', ' ', 't', 'y', 'p', 'i', 'n', 'g', ';', ' ', 'g', 'r', 'a', 'd', 'u', 'a', 'l', ' ', '(', 's', 'i', 'n', 'c', 'e', ' ', '3', '.', '5', ',', ' ', 'b', 'u', 't', ' ', 'i', 'g', 'n', 'o', 'r', 'e', 'd', ' ', 'i', 'n', ' ', 'C', 'P', 'y', 't', 'h', 'o', 'n', ')', '\\n', 'F', 'i', 'r', 's', 't', ' ', 'a', 'p', 'p', 'e', 'a', 'r', 'e', 'd', ':', ' ', 'F', 'e', 'b', 'r', 'u', 'a', 'r', 'y', ' ', '1', '9', '9', '1', ';', ' ', '3', '0', ' ', 'y', 'e', 'a', 'r', 's', ' ', 'a', 'g', 'o', '\\n', 'P', 'a', 'r', 'a', 'd', 'i', 'g', 'm', ':', ' ', 'M', 'u', 'l', 't', 'i', '-', 'p', 'a', 'r', 'a', 'd', 'i', 'g', 'm', ':', ' ', 'o', 'b', 'j', 'e', 'c', 't', '-', 'o', 'r', 'i', 'e', 'n', 't', 'e', 'd', ',', ' ', 'p', 'r', 'o', 'c', 'e', 'd', 'u', 'r', 'a', 'l', ' ', '(', 'i', 'm', 'p', 'e', 'r', 'a', 't', 'i', 'v', 'e', ')', ',', ' ', 'f', 'u', 'n', 'c', 't', 'i', 'o', 'n', 'a', 'l', ',', ' ', 's', 't', 'r', 'u', 'c', 't', 'u', 'r', 'e', 'd', ',', ' ', 'r', 'e', 'f', 'l', 'e', 'c', 't', 'i', 'v', 'e']\n"
     ]
    }
   ],
   "source": [
    "print(list(s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['P', 'P', 'W', 'D', 'P', 'S', 'F', 'S', 'M', 'P', 'M', 'T', 'D', 'C', 'P', 'F', 'F', 'P', 'M']\n"
     ]
    }
   ],
   "source": [
    "li = []\n",
    "\n",
    "for char in s:\n",
    "    if char.isupper():\n",
    "        li.append(char)\n",
    "print(li)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[' ', ' ', ' ', ' ', '-', ' ', '-', ' ', ' ', '.', ' ', \"'\", ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '.', ' ', '\\n', ':', ' ', ' ', ' ', '\\n', ' ', ':', ' ', '.', '.', ' ', '/', ' ', ' ', ' ', ';', ' ', ' ', ' ', '\\n', ' ', ':', ' ', '.', '.', ' ', '/', ' ', ' ', ' ', ';', ' ', ' ', ' ', '\\n', ' ', ':', ' ', ',', ' ', ',', ' ', ' ', ';', ' ', ' ', '(', ' ', '.', ',', ' ', ' ', ' ', ' ', ')', '\\n', ' ', ':', ' ', ' ', ';', ' ', ' ', ' ', '\\n', ':', ' ', '-', ':', ' ', '-', ',', ' ', ' ', '(', ')', ',', ' ', ',', ' ', ',', ' ']\n"
     ]
    }
   ],
   "source": [
    "li = []\n",
    "\n",
    "for char in s:\n",
    "    if not char.isalnum():\n",
    "        li.append(char)\n",
    "print(li)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "565\n"
     ]
    }
   ],
   "source": [
    "print(len(s))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "replace all special characters with `**`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Python is an interpreted high-level general-purpose programming language. Python's design philosophy emphasizes code readability with its notable use of significant indentation. Wikipedia\n",
      "Developer: Python Software Foundation\n",
      "Stable release: 3.9.5 / 3 May 2021; 29 days ago\n",
      "Preview release: 3.10.0b1 / 3 May 2021; 29 days ago\n",
      "Typing discipline: Duck, dynamic, strong typing; gradual (since 3.5, but ignored in CPython)\n",
      "First appeared: February 1991; 30 years ago\n",
      "Paradigm: Multi-paradigm: object-oriented, procedural (imperative), functional, structured, reflective\n"
     ]
    }
   ],
   "source": [
    "print(s)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Python**is**an**interpreted**high**level**general**purpose**programming**language****Python**s**design**philosophy**emphasizes**code**readability**with**its**notable**use**of**significant**indentation****Wikipedia**Developer****Python**Software**Foundation**Stable**release****3**9**5******3**May**2021****29**days**ago**Preview**release****3**10**0b1******3**May**2021****29**days**ago**Typing**discipline****Duck****dynamic****strong**typing****gradual****since**3**5****but**ignored**in**CPython****First**appeared****February**1991****30**years**ago**Paradigm****Multi**paradigm****object**oriented****procedural****imperative******functional****structured****reflective\n"
     ]
    }
   ],
   "source": [
    "s1 = \"\"\n",
    "\n",
    "for char in s:\n",
    "    if not char.isalnum():\n",
    "        s1 += '**'\n",
    "    else:\n",
    "        s1 += char\n",
    "\n",
    "        \n",
    "print(s1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Python is an interpreted high**level general**purpose programming language** Python**s design philosophy emphasizes code readability with its notable use of significant indentation** Wikipedia\n",
      "Developer** Python Software Foundation\n",
      "Stable release** 3**9**5 ** 3 May 2021** 29 days ago\n",
      "Preview release** 3**10**0b1 ** 3 May 2021** 29 days ago\n",
      "Typing discipline** Duck** dynamic** strong typing** gradual **since 3**5** but ignored in CPython**\n",
      "First appeared** February 1991** 30 years ago\n",
      "Paradigm** Multi**paradigm** object**oriented** procedural **imperative**** functional** structured** reflective\n"
     ]
    }
   ],
   "source": [
    "s1 = \"\"\n",
    "\n",
    "for char in s:\n",
    "    if not char.isalnum() and char != ' ' and not char.isspace():\n",
    "        s1 += '**'\n",
    "    else:\n",
    "        s1 += char\n",
    "\n",
    "        \n",
    "print(s1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['is', 'an', 'interpreted', 'high-level', 'general-purpose', 'programming', 'language.', 'design', 'philosophy', 'emphasizes', 'code', 'readability', 'with', 'its', 'notable', 'use', 'of', 'significant', 'indentation.', 'release:', 'days', 'ago', 'release:', 'days', 'ago', 'discipline:', 'dynamic,', 'strong', 'typing;', 'gradual', 'but', 'ignored', 'in', 'appeared:', 'years', 'ago', 'object-oriented,', 'procedural', 'functional,', 'structured,', 'reflective']\n"
     ]
    }
   ],
   "source": [
    "ss = s.split()\n",
    "li = []\n",
    "\n",
    "for char in ss:\n",
    "    if char[0].islower():\n",
    "        li.append(char)\n",
    "print(li)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Regular Expression\n",
    "\n",
    "a group of character/special characters for matching the pattern"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [],
   "source": [
    "import re"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Support for regular expressions (RE).\n",
      "\n",
      "This module provides regular expression matching operations similar to\n",
      "those found in Perl.  It supports both 8-bit and Unicode strings; both\n",
      "the pattern and the strings being processed can contain null bytes and\n",
      "characters outside the US ASCII range.\n",
      "\n",
      "Regular expressions can contain both special and ordinary characters.\n",
      "Most ordinary characters, like \"A\", \"a\", or \"0\", are the simplest\n",
      "regular expressions; they simply match themselves.  You can\n",
      "concatenate ordinary characters, so last matches the string 'last'.\n",
      "\n",
      "The special characters are:\n",
      "    \".\"      Matches any character except a newline.\n",
      "    \"^\"      Matches the start of the string.\n",
      "    \"$\"      Matches the end of the string or just before the newline at\n",
      "             the end of the string.\n",
      "    \"*\"      Matches 0 or more (greedy) repetitions of the preceding RE.\n",
      "             Greedy means that it will match as many repetitions as possible.\n",
      "    \"+\"      Matches 1 or more (greedy) repetitions of the preceding RE.\n",
      "    \"?\"      Matches 0 or 1 (greedy) of the preceding RE.\n",
      "    *?,+?,?? Non-greedy versions of the previous three special characters.\n",
      "    {m,n}    Matches from m to n repetitions of the preceding RE.\n",
      "    {m,n}?   Non-greedy version of the above.\n",
      "    \"\\\\\"     Either escapes special characters or signals a special sequence.\n",
      "    []       Indicates a set of characters.\n",
      "             A \"^\" as the first character indicates a complementing set.\n",
      "    \"|\"      A|B, creates an RE that will match either A or B.\n",
      "    (...)    Matches the RE inside the parentheses.\n",
      "             The contents can be retrieved or matched later in the string.\n",
      "    (?aiLmsux) The letters set the corresponding flags defined below.\n",
      "    (?:...)  Non-grouping version of regular parentheses.\n",
      "    (?P<name>...) The substring matched by the group is accessible by name.\n",
      "    (?P=name)     Matches the text matched earlier by the group named name.\n",
      "    (?#...)  A comment; ignored.\n",
      "    (?=...)  Matches if ... matches next, but doesn't consume the string.\n",
      "    (?!...)  Matches if ... doesn't match next.\n",
      "    (?<=...) Matches if preceded by ... (must be fixed length).\n",
      "    (?<!...) Matches if not preceded by ... (must be fixed length).\n",
      "    (?(id/name)yes|no) Matches yes pattern if the group with id/name matched,\n",
      "                       the (optional) no pattern otherwise.\n",
      "\n",
      "The special sequences consist of \"\\\\\" and a character from the list\n",
      "below.  If the ordinary character is not on the list, then the\n",
      "resulting RE will match the second character.\n",
      "    \\number  Matches the contents of the group of the same number.\n",
      "    \\A       Matches only at the start of the string.\n",
      "    \\Z       Matches only at the end of the string.\n",
      "    \\b       Matches the empty string, but only at the start or end of a word.\n",
      "    \\B       Matches the empty string, but not at the start or end of a word.\n",
      "    \\d       Matches any decimal digit; equivalent to the set [0-9] in\n",
      "             bytes patterns or string patterns with the ASCII flag.\n",
      "             In string patterns without the ASCII flag, it will match the whole\n",
      "             range of Unicode digits.\n",
      "    \\D       Matches any non-digit character; equivalent to [^\\d].\n",
      "    \\s       Matches any whitespace character; equivalent to [ \\t\\n\\r\\f\\v] in\n",
      "             bytes patterns or string patterns with the ASCII flag.\n",
      "             In string patterns without the ASCII flag, it will match the whole\n",
      "             range of Unicode whitespace characters.\n",
      "    \\S       Matches any non-whitespace character; equivalent to [^\\s].\n",
      "    \\w       Matches any alphanumeric character; equivalent to [a-zA-Z0-9_]\n",
      "             in bytes patterns or string patterns with the ASCII flag.\n",
      "             In string patterns without the ASCII flag, it will match the\n",
      "             range of Unicode alphanumeric characters (letters plus digits\n",
      "             plus underscore).\n",
      "             With LOCALE, it will match the set [0-9_] plus characters defined\n",
      "             as letters for the current locale.\n",
      "    \\W       Matches the complement of \\w.\n",
      "    \\\\       Matches a literal backslash.\n",
      "\n",
      "This module exports the following functions:\n",
      "    match     Match a regular expression pattern to the beginning of a string.\n",
      "    fullmatch Match a regular expression pattern to all of a string.\n",
      "    search    Search a string for the presence of a pattern.\n",
      "    sub       Substitute occurrences of a pattern found in a string.\n",
      "    subn      Same as sub, but also return the number of substitutions made.\n",
      "    split     Split a string by the occurrences of a pattern.\n",
      "    findall   Find all occurrences of a pattern in a string.\n",
      "    finditer  Return an iterator yielding a Match object for each match.\n",
      "    compile   Compile a pattern into a Pattern object.\n",
      "    purge     Clear the regular expression cache.\n",
      "    escape    Backslash all non-alphanumerics in a string.\n",
      "\n",
      "Each function other than purge and escape can take an optional 'flags' argument\n",
      "consisting of one or more of the following module constants, joined by \"|\".\n",
      "A, L, and U are mutually exclusive.\n",
      "    A  ASCII       For string patterns, make \\w, \\W, \\b, \\B, \\d, \\D\n",
      "                   match the corresponding ASCII character categories\n",
      "                   (rather than the whole Unicode categories, which is the\n",
      "                   default).\n",
      "                   For bytes patterns, this flag is the only available\n",
      "                   behaviour and needn't be specified.\n",
      "    I  IGNORECASE  Perform case-insensitive matching.\n",
      "    L  LOCALE      Make \\w, \\W, \\b, \\B, dependent on the current locale.\n",
      "    M  MULTILINE   \"^\" matches the beginning of lines (after a newline)\n",
      "                   as well as the string.\n",
      "                   \"$\" matches the end of lines (before a newline) as well\n",
      "                   as the end of the string.\n",
      "    S  DOTALL      \".\" matches any character at all, including the newline.\n",
      "    X  VERBOSE     Ignore whitespace and comments for nicer looking RE's.\n",
      "    U  UNICODE     For compatibility only. Ignored for string patterns (it\n",
      "                   is the default), and forbidden for bytes patterns.\n",
      "\n",
      "This module also defines an exception 'error'.\n",
      "\n",
      "\n"
     ]
    }
   ],
   "source": [
    "print(re.__doc__)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "| Character(s) | What it does                                                 |\n",
    "| :----------- | :----------------------------------------------------------- |\n",
    "| .            | A period. Matches any single character except the newline character. |\n",
    "| ^            | A caret. Matches a pattern at the start of the string.       |\n",
    "| \\A           | Uppercase A. Matches only at the start of the string.        |\n",
    "| $            | Dollar sign. Matches the end of the string.                  |\n",
    "| \\Z           | Uppercase Z. Matches only at the end of the string.          |\n",
    "| [ ]          | Matches the set of characters you specify within it.         |\n",
    "| \\            | ∙ If the character following the backslash is a recognized escape character, then the special meaning of the term is taken. ∙ Else the backslash () is treated like any other character and passed through. ∙ It can be used in front of all the metacharacters to remove their special meaning. |\n",
    "| \\w           | Lowercase w. Matches any single letter, digit, or underscore. |\n",
    "| \\W           | Uppercase W. Matches any character not part of `\\w` (lowercase w). |\n",
    "| \\s           | Lowercase s. Matches a single whitespace character like: space, newline, tab, return. |\n",
    "| \\S           | Uppercase S. Matches any character not part of `\\s` (lowercase s). |\n",
    "| \\d           | Lowercase d. Matches decimal digit 0-9.                      |\n",
    "| \\D           | Uppercase D. Matches any character that is not a decimal digit. |\n",
    "| \\t           | Lowercase t. Matches tab.                                    |\n",
    "| \\n           | Lowercase n. Matches newline.                                |\n",
    "| \\r           | Lowercase r. Matches return.                                 |\n",
    "| \\b           | Lowercase b. Matches only the beginning or end of the word.  |\n",
    "| +            | Checks if the preceding character appears one or more times. |\n",
    "| *            | Checks if the preceding character appears zero or more times. |\n",
    "| ?            | ∙ Checks if the preceding character appears exactly zero or one time. ∙ Specifies a non-greedy version of +, * |\n",
    "| { }          | Checks for an explicit number of times.                      |\n",
    "| ( )          | Creates a group when performing matches.                     |\n",
    "| < >          | Creates a named group when performing matches.               |\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### syntax\n",
    "\n",
    "\n",
    "- method(pattern, string)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['P', 'P', 'P', 'P', 'P', 'P']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('P', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['Pyt', 'Pyt', 'Pyt', 'Pre', 'Pyt', 'Par']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('P..', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['an ', 'al-', 'amm', 'ang', 'age', 'asi', 'ada', 'abl', 'ant', 'ati', 'are', 'ati', 'abl', 'ase', 'ay ', 'ays', 'ago', 'ase', 'ay ', 'ays', 'ago', 'ami', 'adu', 'al ', 'app', 'are', 'ary', 'ars', 'ago', 'ara', 'ara', 'al ', 'ati', 'al,']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('a..', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Python is an interpreted high-level general-purpose programming language. Python's design philosophy emphasizes code readability with its notable use of significant indentation. Wikipedia\n",
      "Developer: Python Software Foundation\n",
      "Stable release: 3.9.5 / 3 May 2021; 29 days ago\n",
      "Preview release: 3.10.0b1 / 3 May 2021; 29 days ago\n",
      "Typing discipline: Duck, dynamic, strong typing; gradual (since 3.5, but ignored in CPython)\n",
      "First appeared: February 1991; 30 years ago\n",
      "Paradigm: Multi-paradigm: object-oriented, procedural (imperative), functional, structured, reflective\n"
     ]
    }
   ],
   "source": [
    "print(s)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['Pyt']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('^P..', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['Py']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\A..', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['ive']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('..e$', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['ctive']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('....e$', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[]\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('....E$', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "\"Python is an interpreted high-level general-purpose programming language. Python's design philosophy emphasizes code readability with its notable use of significant indentation. Wikipedia\\nDeveloper: Python Software Foundation\\nStable release: 3.9.5 / 3 May 2021; 29 days ago\\nPreview release: 3.10.0b1 / 3 May 2021; 29 days ago\\nTyping discipline: Duck, dynamic, strong typing; gradual (since 3.5, but ignored in CPython)\\nFirst appeared: February 1991; 30 years ago\\nParadigm: Multi-paradigm: object-oriented, procedural (imperative), functional, structured, reflective\""
      ]
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['vkbZ']\n"
     ]
    }
   ],
   "source": [
    "st = 'kjbdvkjsdbvkjbvkbZ'\n",
    "\n",
    "\n",
    "print(re.findall('....\\Z', st))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['Pyt', 'hon', ' is', ' an', ' in', 'ter', 'pre', 'ted', ' hi', 'gh-', 'lev', 'el ', 'gen', 'era', 'l-p', 'urp', 'ose', ' pr', 'ogr', 'amm', 'ing', ' la', 'ngu', 'age', '. P', 'yth', \"on'\", 's d', 'esi', 'gn ', 'phi', 'los', 'oph', 'y e', 'mph', 'asi', 'zes', ' co', 'de ', 'rea', 'dab', 'ili', 'ty ', 'wit', 'h i', 'ts ', 'not', 'abl', 'e u', 'se ', 'of ', 'sig', 'nif', 'ica', 'nt ', 'ind', 'ent', 'ati', 'on.', ' Wi', 'kip', 'edi', 'Dev', 'elo', 'per', ': P', 'yth', 'on ', 'Sof', 'twa', 're ', 'Fou', 'nda', 'tio', 'Sta', 'ble', ' re', 'lea', 'se:', ' 3.', '9.5', ' / ', '3 M', 'ay ', '202', '1; ', '29 ', 'day', 's a', 'Pre', 'vie', 'w r', 'ele', 'ase', ': 3', '.10', '.0b', '1 /', ' 3 ', 'May', ' 20', '21;', ' 29', ' da', 'ys ', 'ago', 'Typ', 'ing', ' di', 'sci', 'pli', 'ne:', ' Du', 'ck,', ' dy', 'nam', 'ic,', ' st', 'ron', 'g t', 'ypi', 'ng;', ' gr', 'adu', 'al ', '(si', 'nce', ' 3.', '5, ', 'but', ' ig', 'nor', 'ed ', 'in ', 'CPy', 'tho', 'Fir', 'st ', 'app', 'ear', 'ed:', ' Fe', 'bru', 'ary', ' 19', '91;', ' 30', ' ye', 'ars', ' ag', 'Par', 'adi', 'gm:', ' Mu', 'lti', '-pa', 'rad', 'igm', ': o', 'bje', 'ct-', 'ori', 'ent', 'ed,', ' pr', 'oce', 'dur', 'al ', '(im', 'per', 'ati', 've)', ', f', 'unc', 'tio', 'nal', ', s', 'tru', 'ctu', 'red', ', r', 'efl', 'ect', 'ive']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('...', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['Pyt', 'hon', ' is', ' an', ' in', 'ter', 'pre', 'ted', ' hi', 'h-l', 'eve', 'l g', 'ene', 'ral', '-pu', 'rpo', 'e p', 'rog', 'ram', 'min', 'g l', 'ang', 'uag', ' Py', 'tho', \"n's\", ' de', 'sig', 'n p', 'hil', 'oso', 'phy', ' em', 'pha', 'siz', 's c', 'ode', ' re', 'ada', 'bil', 'ity', ' wi', 'h i', 's n', 'ota', 'ble', ' us', 'e o', 'f s', 'ign', 'ifi', 'can', 't i', 'nde', 'nta', 'tio', ' Wi', 'kip', 'edi', 'Dev', 'elo', 'per', ' Py', 'tho', ' So', 'ftw', 'are', ' Fo', 'und', 'ati', 'Sta', 'ble', ' re', 'lea', ' Ma', '9 d', 'ays', ' ag', 'Pre', 'vie', 'w r', 'ele', 'ase', '.0b', ' Ma', '9 d', 'ays', ' ag', 'Typ', 'ing', ' di', 'sci', 'pli', ' Du', ', d', 'yna', 'mic', ', s', 'tro', 'g t', 'ypi', '; g', 'rad', 'ual', ' (s', 'inc', ', b', 't i', 'gno', 'red', ' in', 'CPy', 'tho', 'Fir', 't a', 'ppe', 'are', ' Fe', 'bru', 'ary', '0 y', 'ear', 's a', 'Par', 'adi', ' Mu', 'lti', '-pa', 'rad', 'igm', ': o', 'bje', 't-o', 'rie', 'nte', ', p', 'roc', 'edu', 'ral', ' (i', 'mpe', 'rat', 'ive', ', f', 'unc', 'tio', 'nal', ', s', 'tru', 'ctu', 'red', ', r', 'efl', 'ect', 'ive']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('..[a-z]', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['yth', 'n i', 's a', 'n i', 'nte', 'rpr', 'ete', 'd h', 'igh', 'lev', 'l g', 'ene', 'ral', 'pur', 'pos', 'e p', 'rog', 'ram', 'min', 'g l', 'ang', 'uag', 'yth', \"n's\", 'des', 'ign', 'phi', 'los', 'oph', 'y e', 'mph', 'asi', 'zes', 'cod', 'e r', 'ead', 'abi', 'lit', 'y w', 'ith', 'its', 'not', 'abl', 'e u', 'e o', 'f s', 'ign', 'ifi', 'can', 't i', 'nde', 'nta', 'tio', 'iki', 'ped', 'eve', 'lop', 'yth', 'oft', 'war', 'oun', 'dat', 'ion', 'tab', 'e r', 'ele', 'ase', 'day', 's a', 'rev', 'iew', 'rel', 'eas', 'day', 's a', 'ypi', 'g d', 'isc', 'ipl', 'ine', 'uck', 'dyn', 'ami', 'str', 'ong', 'typ', 'ing', 'gra', 'dua', 'sin', 'but', 'ign', 'ore', 'd i', 'yth', 'irs', 't a', 'ppe', 'are', 'ebr', 'uar', 'yea', 's a', 'ara', 'dig', 'ult', 'i-p', 'ara', 'dig', 'obj', 'ect', 'ori', 'ent', 'pro', 'ced', 'ura', 'imp', 'era', 'tiv', 'fun', 'cti', 'ona', 'str', 'uct', 'ure', 'ref', 'lec', 'tiv']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z].[a-z]', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['Pyt', 'hon', 's a', 'n i', 'nte', 'rpr', 'ete', 'd h', 'igh', 'lev', 'l g', 'ene', 'ral', 'pur', 'pos', 'e p', 'rog', 'ram', 'min', 'g l', 'ang', 'uag', 'Pyt', 'hon', 's d', 'esi', 'n p', 'hil', 'oso', 'phy', 'emp', 'has', 'ize', 's c', 'ode', 'rea', 'dab', 'ili', 'y w', 'ith', 'its', 'not', 'abl', 'e u', 'e o', 'f s', 'ign', 'ifi', 'can', 't i', 'nde', 'nta', 'tio', 'Wik', 'ipe', 'dia', 'Dev', 'elo', 'per', 'Pyt', 'hon', 'Sof', 'twa', 'Fou', 'nda', 'tio', 'Sta', 'ble', 'rel', 'eas', 'May', 'day', 's a', 'Pre', 'vie', 'w r', 'ele', 'ase', 'May', 'day', 's a', 'Typ', 'ing', 'dis', 'cip', 'lin', 'Duc', 'dyn', 'ami', 'str', 'ong', 'typ', 'ing', 'gra', 'dua', 'sin', 'but', 'ign', 'ore', 'd i', 'CPy', 'tho', 'Fir', 't a', 'ppe', 'are', 'Feb', 'rua', 'yea', 's a', 'Par', 'adi', 'Mul', 'i-p', 'ara', 'dig', 'obj', 'ect', 'ori', 'ent', 'pro', 'ced', 'ura', 'imp', 'era', 'tiv', 'fun', 'cti', 'ona', 'str', 'uct', 'ure', 'ref', 'lec', 'tiv']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[A-Za-z].[a-z]', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['Pyt', 'hon', 'int', 'erp', 'ret', 'hig', 'lev', 'gen', 'era', 'pur', 'pos', 'pro', 'gra', 'mmi', 'lan', 'gua', 'Pyt', 'hon', 'des', 'ign', 'phi', 'los', 'oph', 'emp', 'has', 'ize', 'cod', 'rea', 'dab', 'ili', 'wit', 'its', 'not', 'abl', 'use', 'sig', 'nif', 'ica', 'ind', 'ent', 'ati', 'Wik', 'ipe', 'dia', 'Dev', 'elo', 'per', 'Pyt', 'hon', 'Sof', 'twa', 'Fou', 'nda', 'tio', 'Sta', 'ble', 'rel', 'eas', 'May', 'day', 'ago', 'Pre', 'vie', 'rel', 'eas', 'May', 'day', 'ago', 'Typ', 'ing', 'dis', 'cip', 'lin', 'Duc', 'dyn', 'ami', 'str', 'ong', 'typ', 'ing', 'gra', 'dua', 'sin', 'but', 'ign', 'ore', 'Pyt', 'hon', 'Fir', 'app', 'ear', 'Feb', 'rua', 'yea', 'ago', 'Par', 'adi', 'Mul', 'par', 'adi', 'obj', 'ect', 'ori', 'ent', 'pro', 'ced', 'ura', 'imp', 'era', 'tiv', 'fun', 'cti', 'ona', 'str', 'uct', 'ure', 'ref', 'lec', 'tiv']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[A-Za-z][a-z][a-z]', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['Pyt', 'Pyt', 'Wik', 'Dev', 'Pyt', 'Sof', 'Fou', 'Sta', 'May', 'Pre', 'May', 'Typ', 'Duc', 'Pyt', 'Fir', 'Feb', 'Par', 'Mul']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[A-Z][a-z][a-z]', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "metadata": {},
   "outputs": [],
   "source": [
    "d = 'Today I recieved 10$ from my boss'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['10$']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('..\\$', d))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 47,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['ss']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('..$', d))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 48,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[]\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('..e$', d))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 49,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['P', 'y', 't', 'h', 'o', 'n', ' ', 'i', 's', ' ', 'a', 'n', ' ', 'i', 'n', 't', 'e', 'r', 'p', 'r', 'e', 't', 'e', 'd', ' ', 'h', 'i', 'g', 'h', '-', 'l', 'e', 'v', 'e', 'l', ' ', 'g', 'e', 'n', 'e', 'r', 'a', 'l', '-', 'p', 'u', 'r', 'p', 'o', 's', 'e', ' ', 'p', 'r', 'o', 'g', 'r', 'a', 'm', 'm', 'i', 'n', 'g', ' ', 'l', 'a', 'n', 'g', 'u', 'a', 'g', 'e', '.', ' ', 'P', 'y', 't', 'h', 'o', 'n', \"'\", 's', ' ', 'd', 'e', 's', 'i', 'g', 'n', ' ', 'p', 'h', 'i', 'l', 'o', 's', 'o', 'p', 'h', 'y', ' ', 'e', 'm', 'p', 'h', 'a', 's', 'i', 'z', 'e', 's', ' ', 'c', 'o', 'd', 'e', ' ', 'r', 'e', 'a', 'd', 'a', 'b', 'i', 'l', 'i', 't', 'y', ' ', 'w', 'i', 't', 'h', ' ', 'i', 't', 's', ' ', 'n', 'o', 't', 'a', 'b', 'l', 'e', ' ', 'u', 's', 'e', ' ', 'o', 'f', ' ', 's', 'i', 'g', 'n', 'i', 'f', 'i', 'c', 'a', 'n', 't', ' ', 'i', 'n', 'd', 'e', 'n', 't', 'a', 't', 'i', 'o', 'n', '.', ' ', 'W', 'i', 'k', 'i', 'p', 'e', 'd', 'i', 'a', 'D', 'e', 'v', 'e', 'l', 'o', 'p', 'e', 'r', ':', ' ', 'P', 'y', 't', 'h', 'o', 'n', ' ', 'S', 'o', 'f', 't', 'w', 'a', 'r', 'e', ' ', 'F', 'o', 'u', 'n', 'd', 'a', 't', 'i', 'o', 'n', 'S', 't', 'a', 'b', 'l', 'e', ' ', 'r', 'e', 'l', 'e', 'a', 's', 'e', ':', ' ', '3', '.', '9', '.', '5', ' ', '/', ' ', '3', ' ', 'M', 'a', 'y', ' ', '2', '0', '2', '1', ';', ' ', '2', '9', ' ', 'd', 'a', 'y', 's', ' ', 'a', 'g', 'o', 'P', 'r', 'e', 'v', 'i', 'e', 'w', ' ', 'r', 'e', 'l', 'e', 'a', 's', 'e', ':', ' ', '3', '.', '1', '0', '.', '0', 'b', '1', ' ', '/', ' ', '3', ' ', 'M', 'a', 'y', ' ', '2', '0', '2', '1', ';', ' ', '2', '9', ' ', 'd', 'a', 'y', 's', ' ', 'a', 'g', 'o', 'T', 'y', 'p', 'i', 'n', 'g', ' ', 'd', 'i', 's', 'c', 'i', 'p', 'l', 'i', 'n', 'e', ':', ' ', 'D', 'u', 'c', 'k', ',', ' ', 'd', 'y', 'n', 'a', 'm', 'i', 'c', ',', ' ', 's', 't', 'r', 'o', 'n', 'g', ' ', 't', 'y', 'p', 'i', 'n', 'g', ';', ' ', 'g', 'r', 'a', 'd', 'u', 'a', 'l', ' ', '(', 's', 'i', 'n', 'c', 'e', ' ', '3', '.', '5', ',', ' ', 'b', 'u', 't', ' ', 'i', 'g', 'n', 'o', 'r', 'e', 'd', ' ', 'i', 'n', ' ', 'C', 'P', 'y', 't', 'h', 'o', 'n', ')', 'F', 'i', 'r', 's', 't', ' ', 'a', 'p', 'p', 'e', 'a', 'r', 'e', 'd', ':', ' ', 'F', 'e', 'b', 'r', 'u', 'a', 'r', 'y', ' ', '1', '9', '9', '1', ';', ' ', '3', '0', ' ', 'y', 'e', 'a', 'r', 's', ' ', 'a', 'g', 'o', 'P', 'a', 'r', 'a', 'd', 'i', 'g', 'm', ':', ' ', 'M', 'u', 'l', 't', 'i', '-', 'p', 'a', 'r', 'a', 'd', 'i', 'g', 'm', ':', ' ', 'o', 'b', 'j', 'e', 'c', 't', '-', 'o', 'r', 'i', 'e', 'n', 't', 'e', 'd', ',', ' ', 'p', 'r', 'o', 'c', 'e', 'd', 'u', 'r', 'a', 'l', ' ', '(', 'i', 'm', 'p', 'e', 'r', 'a', 't', 'i', 'v', 'e', ')', ',', ' ', 'f', 'u', 'n', 'c', 't', 'i', 'o', 'n', 'a', 'l', ',', ' ', 's', 't', 'r', 'u', 'c', 't', 'u', 'r', 'e', 'd', ',', ' ', 'r', 'e', 'f', 'l', 'e', 'c', 't', 'i', 'v', 'e']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('.', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 50,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['.', '.', '.', '.', '.', '.', '.']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\.', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 51,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['P', 'y', 't', 'h', 'o', 'n', 'i', 's', 'a', 'n', 'i', 'n', 't', 'e', 'r', 'p', 'r', 'e', 't', 'e', 'd', 'h', 'i', 'g', 'h', 'l', 'e', 'v', 'e', 'l', 'g', 'e', 'n', 'e', 'r', 'a', 'l', 'p', 'u', 'r', 'p', 'o', 's', 'e', 'p', 'r', 'o', 'g', 'r', 'a', 'm', 'm', 'i', 'n', 'g', 'l', 'a', 'n', 'g', 'u', 'a', 'g', 'e', 'P', 'y', 't', 'h', 'o', 'n', 's', 'd', 'e', 's', 'i', 'g', 'n', 'p', 'h', 'i', 'l', 'o', 's', 'o', 'p', 'h', 'y', 'e', 'm', 'p', 'h', 'a', 's', 'i', 'z', 'e', 's', 'c', 'o', 'd', 'e', 'r', 'e', 'a', 'd', 'a', 'b', 'i', 'l', 'i', 't', 'y', 'w', 'i', 't', 'h', 'i', 't', 's', 'n', 'o', 't', 'a', 'b', 'l', 'e', 'u', 's', 'e', 'o', 'f', 's', 'i', 'g', 'n', 'i', 'f', 'i', 'c', 'a', 'n', 't', 'i', 'n', 'd', 'e', 'n', 't', 'a', 't', 'i', 'o', 'n', 'W', 'i', 'k', 'i', 'p', 'e', 'd', 'i', 'a', 'D', 'e', 'v', 'e', 'l', 'o', 'p', 'e', 'r', 'P', 'y', 't', 'h', 'o', 'n', 'S', 'o', 'f', 't', 'w', 'a', 'r', 'e', 'F', 'o', 'u', 'n', 'd', 'a', 't', 'i', 'o', 'n', 'S', 't', 'a', 'b', 'l', 'e', 'r', 'e', 'l', 'e', 'a', 's', 'e', '3', '9', '5', '3', 'M', 'a', 'y', '2', '0', '2', '1', '2', '9', 'd', 'a', 'y', 's', 'a', 'g', 'o', 'P', 'r', 'e', 'v', 'i', 'e', 'w', 'r', 'e', 'l', 'e', 'a', 's', 'e', '3', '1', '0', '0', 'b', '1', '3', 'M', 'a', 'y', '2', '0', '2', '1', '2', '9', 'd', 'a', 'y', 's', 'a', 'g', 'o', 'T', 'y', 'p', 'i', 'n', 'g', 'd', 'i', 's', 'c', 'i', 'p', 'l', 'i', 'n', 'e', 'D', 'u', 'c', 'k', 'd', 'y', 'n', 'a', 'm', 'i', 'c', 's', 't', 'r', 'o', 'n', 'g', 't', 'y', 'p', 'i', 'n', 'g', 'g', 'r', 'a', 'd', 'u', 'a', 'l', 's', 'i', 'n', 'c', 'e', '3', '5', 'b', 'u', 't', 'i', 'g', 'n', 'o', 'r', 'e', 'd', 'i', 'n', 'C', 'P', 'y', 't', 'h', 'o', 'n', 'F', 'i', 'r', 's', 't', 'a', 'p', 'p', 'e', 'a', 'r', 'e', 'd', 'F', 'e', 'b', 'r', 'u', 'a', 'r', 'y', '1', '9', '9', '1', '3', '0', 'y', 'e', 'a', 'r', 's', 'a', 'g', 'o', 'P', 'a', 'r', 'a', 'd', 'i', 'g', 'm', 'M', 'u', 'l', 't', 'i', 'p', 'a', 'r', 'a', 'd', 'i', 'g', 'm', 'o', 'b', 'j', 'e', 'c', 't', 'o', 'r', 'i', 'e', 'n', 't', 'e', 'd', 'p', 'r', 'o', 'c', 'e', 'd', 'u', 'r', 'a', 'l', 'i', 'm', 'p', 'e', 'r', 'a', 't', 'i', 'v', 'e', 'f', 'u', 'n', 'c', 't', 'i', 'o', 'n', 'a', 'l', 's', 't', 'r', 'u', 'c', 't', 'u', 'r', 'e', 'd', 'r', 'e', 'f', 'l', 'e', 'c', 't', 'i', 'v', 'e']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\w', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 52,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[' ', ' ', ' ', ' ', '-', ' ', '-', ' ', ' ', '.', ' ', \"'\", ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '.', ' ', '\\n', ':', ' ', ' ', ' ', '\\n', ' ', ':', ' ', '.', '.', ' ', '/', ' ', ' ', ' ', ';', ' ', ' ', ' ', '\\n', ' ', ':', ' ', '.', '.', ' ', '/', ' ', ' ', ' ', ';', ' ', ' ', ' ', '\\n', ' ', ':', ' ', ',', ' ', ',', ' ', ' ', ';', ' ', ' ', '(', ' ', '.', ',', ' ', ' ', ' ', ' ', ')', '\\n', ' ', ':', ' ', ' ', ';', ' ', ' ', ' ', '\\n', ':', ' ', '-', ':', ' ', '-', ',', ' ', ' ', '(', ')', ',', ' ', ',', ' ', ',', ' ']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\W', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['3', '9', '5', '3', '2', '0', '2', '1', '2', '9', '3', '1', '0', '0', '1', '3', '2', '0', '2', '1', '2', '9', '3', '5', '1', '9', '9', '1', '3', '0']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\d', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['P', 'y', 't', 'h', 'o', 'n', ' ', 'i', 's', ' ', 'a', 'n', ' ', 'i', 'n', 't', 'e', 'r', 'p', 'r', 'e', 't', 'e', 'd', ' ', 'h', 'i', 'g', 'h', '-', 'l', 'e', 'v', 'e', 'l', ' ', 'g', 'e', 'n', 'e', 'r', 'a', 'l', '-', 'p', 'u', 'r', 'p', 'o', 's', 'e', ' ', 'p', 'r', 'o', 'g', 'r', 'a', 'm', 'm', 'i', 'n', 'g', ' ', 'l', 'a', 'n', 'g', 'u', 'a', 'g', 'e', '.', ' ', 'P', 'y', 't', 'h', 'o', 'n', \"'\", 's', ' ', 'd', 'e', 's', 'i', 'g', 'n', ' ', 'p', 'h', 'i', 'l', 'o', 's', 'o', 'p', 'h', 'y', ' ', 'e', 'm', 'p', 'h', 'a', 's', 'i', 'z', 'e', 's', ' ', 'c', 'o', 'd', 'e', ' ', 'r', 'e', 'a', 'd', 'a', 'b', 'i', 'l', 'i', 't', 'y', ' ', 'w', 'i', 't', 'h', ' ', 'i', 't', 's', ' ', 'n', 'o', 't', 'a', 'b', 'l', 'e', ' ', 'u', 's', 'e', ' ', 'o', 'f', ' ', 's', 'i', 'g', 'n', 'i', 'f', 'i', 'c', 'a', 'n', 't', ' ', 'i', 'n', 'd', 'e', 'n', 't', 'a', 't', 'i', 'o', 'n', '.', ' ', 'W', 'i', 'k', 'i', 'p', 'e', 'd', 'i', 'a', '\\n', 'D', 'e', 'v', 'e', 'l', 'o', 'p', 'e', 'r', ':', ' ', 'P', 'y', 't', 'h', 'o', 'n', ' ', 'S', 'o', 'f', 't', 'w', 'a', 'r', 'e', ' ', 'F', 'o', 'u', 'n', 'd', 'a', 't', 'i', 'o', 'n', '\\n', 'S', 't', 'a', 'b', 'l', 'e', ' ', 'r', 'e', 'l', 'e', 'a', 's', 'e', ':', ' ', '.', '.', ' ', '/', ' ', ' ', 'M', 'a', 'y', ' ', ';', ' ', ' ', 'd', 'a', 'y', 's', ' ', 'a', 'g', 'o', '\\n', 'P', 'r', 'e', 'v', 'i', 'e', 'w', ' ', 'r', 'e', 'l', 'e', 'a', 's', 'e', ':', ' ', '.', '.', 'b', ' ', '/', ' ', ' ', 'M', 'a', 'y', ' ', ';', ' ', ' ', 'd', 'a', 'y', 's', ' ', 'a', 'g', 'o', '\\n', 'T', 'y', 'p', 'i', 'n', 'g', ' ', 'd', 'i', 's', 'c', 'i', 'p', 'l', 'i', 'n', 'e', ':', ' ', 'D', 'u', 'c', 'k', ',', ' ', 'd', 'y', 'n', 'a', 'm', 'i', 'c', ',', ' ', 's', 't', 'r', 'o', 'n', 'g', ' ', 't', 'y', 'p', 'i', 'n', 'g', ';', ' ', 'g', 'r', 'a', 'd', 'u', 'a', 'l', ' ', '(', 's', 'i', 'n', 'c', 'e', ' ', '.', ',', ' ', 'b', 'u', 't', ' ', 'i', 'g', 'n', 'o', 'r', 'e', 'd', ' ', 'i', 'n', ' ', 'C', 'P', 'y', 't', 'h', 'o', 'n', ')', '\\n', 'F', 'i', 'r', 's', 't', ' ', 'a', 'p', 'p', 'e', 'a', 'r', 'e', 'd', ':', ' ', 'F', 'e', 'b', 'r', 'u', 'a', 'r', 'y', ' ', ';', ' ', ' ', 'y', 'e', 'a', 'r', 's', ' ', 'a', 'g', 'o', '\\n', 'P', 'a', 'r', 'a', 'd', 'i', 'g', 'm', ':', ' ', 'M', 'u', 'l', 't', 'i', '-', 'p', 'a', 'r', 'a', 'd', 'i', 'g', 'm', ':', ' ', 'o', 'b', 'j', 'e', 'c', 't', '-', 'o', 'r', 'i', 'e', 'n', 't', 'e', 'd', ',', ' ', 'p', 'r', 'o', 'c', 'e', 'd', 'u', 'r', 'a', 'l', ' ', '(', 'i', 'm', 'p', 'e', 'r', 'a', 't', 'i', 'v', 'e', ')', ',', ' ', 'f', 'u', 'n', 'c', 't', 'i', 'o', 'n', 'a', 'l', ',', ' ', 's', 't', 'r', 'u', 'c', 't', 'u', 'r', 'e', 'd', ',', ' ', 'r', 'e', 'f', 'l', 'e', 'c', 't', 'i', 'v', 'e']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\D', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 55,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['3.', '9.', '5 ', '3 ', '20', '21', '29', '3.', '10', '0b', '1 ', '3 ', '20', '21', '29', '3.', '5,', '19', '91', '30']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\d.', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 56,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['20', '21', '29', '10', '20', '21', '29', '19', '91', '30']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\d\\d', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 57,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['202', '202', '199']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\d\\d\\d', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 58,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['2021', '2021', '1991']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\d\\d\\d\\d', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 59,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[]\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\d\\d\\d\\d\\d', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 60,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[]\n"
     ]
    }
   ],
   "source": [
    "n = '4556'\n",
    "n2 = '365'\n",
    "\n",
    "\n",
    "print(re.findall('^\\d\\d\\d$', n))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 61,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['365']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('^\\d\\d\\d$', n2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 62,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[]\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('^\\d\\d\\d$', '3o5'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 64,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '\\n', ' ', ' ', ' ', '\\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '\\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '\\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '\\n', ' ', ' ', ' ', ' ', ' ', ' ', '\\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\s', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 65,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['P', 'y', 't', 'h', 'o', 'n', 'i', 's', 'a', 'n', 'i', 'n', 't', 'e', 'r', 'p', 'r', 'e', 't', 'e', 'd', 'h', 'i', 'g', 'h', '-', 'l', 'e', 'v', 'e', 'l', 'g', 'e', 'n', 'e', 'r', 'a', 'l', '-', 'p', 'u', 'r', 'p', 'o', 's', 'e', 'p', 'r', 'o', 'g', 'r', 'a', 'm', 'm', 'i', 'n', 'g', 'l', 'a', 'n', 'g', 'u', 'a', 'g', 'e', '.', 'P', 'y', 't', 'h', 'o', 'n', \"'\", 's', 'd', 'e', 's', 'i', 'g', 'n', 'p', 'h', 'i', 'l', 'o', 's', 'o', 'p', 'h', 'y', 'e', 'm', 'p', 'h', 'a', 's', 'i', 'z', 'e', 's', 'c', 'o', 'd', 'e', 'r', 'e', 'a', 'd', 'a', 'b', 'i', 'l', 'i', 't', 'y', 'w', 'i', 't', 'h', 'i', 't', 's', 'n', 'o', 't', 'a', 'b', 'l', 'e', 'u', 's', 'e', 'o', 'f', 's', 'i', 'g', 'n', 'i', 'f', 'i', 'c', 'a', 'n', 't', 'i', 'n', 'd', 'e', 'n', 't', 'a', 't', 'i', 'o', 'n', '.', 'W', 'i', 'k', 'i', 'p', 'e', 'd', 'i', 'a', 'D', 'e', 'v', 'e', 'l', 'o', 'p', 'e', 'r', ':', 'P', 'y', 't', 'h', 'o', 'n', 'S', 'o', 'f', 't', 'w', 'a', 'r', 'e', 'F', 'o', 'u', 'n', 'd', 'a', 't', 'i', 'o', 'n', 'S', 't', 'a', 'b', 'l', 'e', 'r', 'e', 'l', 'e', 'a', 's', 'e', ':', '3', '.', '9', '.', '5', '/', '3', 'M', 'a', 'y', '2', '0', '2', '1', ';', '2', '9', 'd', 'a', 'y', 's', 'a', 'g', 'o', 'P', 'r', 'e', 'v', 'i', 'e', 'w', 'r', 'e', 'l', 'e', 'a', 's', 'e', ':', '3', '.', '1', '0', '.', '0', 'b', '1', '/', '3', 'M', 'a', 'y', '2', '0', '2', '1', ';', '2', '9', 'd', 'a', 'y', 's', 'a', 'g', 'o', 'T', 'y', 'p', 'i', 'n', 'g', 'd', 'i', 's', 'c', 'i', 'p', 'l', 'i', 'n', 'e', ':', 'D', 'u', 'c', 'k', ',', 'd', 'y', 'n', 'a', 'm', 'i', 'c', ',', 's', 't', 'r', 'o', 'n', 'g', 't', 'y', 'p', 'i', 'n', 'g', ';', 'g', 'r', 'a', 'd', 'u', 'a', 'l', '(', 's', 'i', 'n', 'c', 'e', '3', '.', '5', ',', 'b', 'u', 't', 'i', 'g', 'n', 'o', 'r', 'e', 'd', 'i', 'n', 'C', 'P', 'y', 't', 'h', 'o', 'n', ')', 'F', 'i', 'r', 's', 't', 'a', 'p', 'p', 'e', 'a', 'r', 'e', 'd', ':', 'F', 'e', 'b', 'r', 'u', 'a', 'r', 'y', '1', '9', '9', '1', ';', '3', '0', 'y', 'e', 'a', 'r', 's', 'a', 'g', 'o', 'P', 'a', 'r', 'a', 'd', 'i', 'g', 'm', ':', 'M', 'u', 'l', 't', 'i', '-', 'p', 'a', 'r', 'a', 'd', 'i', 'g', 'm', ':', 'o', 'b', 'j', 'e', 'c', 't', '-', 'o', 'r', 'i', 'e', 'n', 't', 'e', 'd', ',', 'p', 'r', 'o', 'c', 'e', 'd', 'u', 'r', 'a', 'l', '(', 'i', 'm', 'p', 'e', 'r', 'a', 't', 'i', 'v', 'e', ')', ',', 'f', 'u', 'n', 'c', 't', 'i', 'o', 'n', 'a', 'l', ',', 's', 't', 'r', 'u', 'c', 't', 'u', 'r', 'e', 'd', ',', 'r', 'e', 'f', 'l', 'e', 'c', 't', 'i', 'v', 'e']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\S', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 66,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Today I recieved 10$ from my boss'"
      ]
     },
     "execution_count": 66,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "d"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 71,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[]\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('\\b.', 'hello'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 74,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['P', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 'P', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 'P', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 'P', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 'P', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 'P', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('P*', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 75,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['P', 'P', 'P', 'P', 'P', 'P']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('P\\d*', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 77,
   "metadata": {},
   "outputs": [],
   "source": [
    "email = 'anilkumar_t@apssdc.in'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 79,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['anilkumar', '', 't', '', 'apssdc', '', 'in', '']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z]*', email))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 80,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['anilkumar_t', '', 'apssdc', '', 'in', '']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z_]*', email))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 82,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['anilkumar', 't', 'apssdc', 'in']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z]+', email))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 83,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['a', 'n', 'i', 'l', 'k', 'u', 'm', 'a', 'r', '', 't', '', 'a', 'p', 's', 's', 'd', 'c', '', 'i', 'n', '']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z]?', email))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 84,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['an', 'il', 'ku', 'ma', 'r_', 't@', 'ap', 'ss', 'dc', '.', 'in']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z]?.', email))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 85,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['an', 'il', 'ku', 'ma', 'r', 't', 'ap', 'ss', 'dc', 'in']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z]?[a-z]', email))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 92,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['em', 'ma', 'cs']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z]{2}', 'emmacs'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 94,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['emm', 'acs']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z]{3}', 'emmacs'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 96,
   "metadata": {},
   "outputs": [],
   "source": [
    "ip = '163.125.255.125'\n",
    "\n",
    "ip2 = '172.160.250.5'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 97,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<re.Match object; span=(0, 15), match='163.125.255.125'>"
      ]
     },
     "execution_count": 97,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.match('163.125.255.[0-2][0-5][0-5]', ip)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 99,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "None\n"
     ]
    }
   ],
   "source": [
    "print(re.match('163.125.255.[0-2][0-5][0-5]', ip2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 100,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(0, 15)"
      ]
     },
     "execution_count": 100,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "obj = re.match('163.125.255.[0-2][0-5][0-5]', ip)\n",
    "\n",
    "\n",
    "obj.span()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 102,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<re.Match object; span=(0, 15), match='163.125.255.125'>"
      ]
     },
     "execution_count": 102,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ip3 = '163.125.255.125opa'\n",
    "\n",
    "re.match('163.125.255.[0-2][0-5][0-5]', ip3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 114,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "None\n"
     ]
    }
   ],
   "source": [
    "ip3 = '163.125.255.125opa'\n",
    "\n",
    "print(re.match('^163.125.255.[0-2][0-5][0-5]$', ip3))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 115,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<re.Match object; span=(0, 15), match='163.125.255.125'>"
      ]
     },
     "execution_count": 115,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.match('^163.125.255.[0-2][0-5][0-5]$', ip)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 113,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'163.125.255.125'"
      ]
     },
     "execution_count": 113,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "obj.string"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "- +91\n",
    "- 6789\n",
    "- 10"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 117,
   "metadata": {},
   "outputs": [],
   "source": [
    "m1 = '9876543210'\n",
    "m2 = '3216549870'\n",
    "m3 = '987654321o'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 118,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<re.Match object; span=(0, 10), match='9876543210'>"
      ]
     },
     "execution_count": 118,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "pattern = '^[6789]\\d{9}$'\n",
    "\n",
    "\n",
    "re.match(pattern, m1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 119,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "None None\n"
     ]
    }
   ],
   "source": [
    "print(re.match(pattern, m2), re.match(pattern, m3))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 120,
   "metadata": {},
   "outputs": [],
   "source": [
    "m4 = '+919876543210'\n",
    "\n",
    "\n",
    "pattern = '+91^[6789]\\d{9}'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 121,
   "metadata": {},
   "outputs": [
    {
     "ename": "error",
     "evalue": "nothing to repeat at position 0",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31merror\u001b[0m                                     Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-121-48189cd206fb>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mre\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mmatch\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mpattern\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mm4\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;32m~\\anaconda3\\lib\\re.py\u001b[0m in \u001b[0;36mmatch\u001b[1;34m(pattern, string, flags)\u001b[0m\n\u001b[0;32m    189\u001b[0m     \"\"\"Try to apply the pattern at the start of the string, returning\n\u001b[0;32m    190\u001b[0m     a Match object, or None if no match was found.\"\"\"\n\u001b[1;32m--> 191\u001b[1;33m     \u001b[1;32mreturn\u001b[0m \u001b[0m_compile\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mpattern\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mflags\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mmatch\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mstring\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m    192\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    193\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mfullmatch\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mpattern\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mstring\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mflags\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;32m~\\anaconda3\\lib\\re.py\u001b[0m in \u001b[0;36m_compile\u001b[1;34m(pattern, flags)\u001b[0m\n\u001b[0;32m    302\u001b[0m     \u001b[1;32mif\u001b[0m \u001b[1;32mnot\u001b[0m \u001b[0msre_compile\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0misstring\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mpattern\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    303\u001b[0m         \u001b[1;32mraise\u001b[0m \u001b[0mTypeError\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"first argument must be string or compiled pattern\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m--> 304\u001b[1;33m     \u001b[0mp\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0msre_compile\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mcompile\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mpattern\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mflags\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m    305\u001b[0m     \u001b[1;32mif\u001b[0m \u001b[1;32mnot\u001b[0m \u001b[1;33m(\u001b[0m\u001b[0mflags\u001b[0m \u001b[1;33m&\u001b[0m \u001b[0mDEBUG\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    306\u001b[0m         \u001b[1;32mif\u001b[0m \u001b[0mlen\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0m_cache\u001b[0m\u001b[1;33m)\u001b[0m \u001b[1;33m>=\u001b[0m \u001b[0m_MAXCACHE\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;32m~\\anaconda3\\lib\\sre_compile.py\u001b[0m in \u001b[0;36mcompile\u001b[1;34m(p, flags)\u001b[0m\n\u001b[0;32m    762\u001b[0m     \u001b[1;32mif\u001b[0m \u001b[0misstring\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mp\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    763\u001b[0m         \u001b[0mpattern\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mp\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m--> 764\u001b[1;33m         \u001b[0mp\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0msre_parse\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mparse\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mp\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mflags\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m    765\u001b[0m     \u001b[1;32melse\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    766\u001b[0m         \u001b[0mpattern\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;32mNone\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;32m~\\anaconda3\\lib\\sre_parse.py\u001b[0m in \u001b[0;36mparse\u001b[1;34m(str, flags, state)\u001b[0m\n\u001b[0;32m    946\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    947\u001b[0m     \u001b[1;32mtry\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m--> 948\u001b[1;33m         \u001b[0mp\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0m_parse_sub\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0msource\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mstate\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mflags\u001b[0m \u001b[1;33m&\u001b[0m \u001b[0mSRE_FLAG_VERBOSE\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m0\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m    949\u001b[0m     \u001b[1;32mexcept\u001b[0m \u001b[0mVerbose\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    950\u001b[0m         \u001b[1;31m# the VERBOSE flag was switched on inside the pattern.  to be\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;32m~\\anaconda3\\lib\\sre_parse.py\u001b[0m in \u001b[0;36m_parse_sub\u001b[1;34m(source, state, verbose, nested)\u001b[0m\n\u001b[0;32m    441\u001b[0m     \u001b[0mstart\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0msource\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mtell\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    442\u001b[0m     \u001b[1;32mwhile\u001b[0m \u001b[1;32mTrue\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m--> 443\u001b[1;33m         itemsappend(_parse(source, state, verbose, nested + 1,\n\u001b[0m\u001b[0;32m    444\u001b[0m                            not nested and not items))\n\u001b[0;32m    445\u001b[0m         \u001b[1;32mif\u001b[0m \u001b[1;32mnot\u001b[0m \u001b[0msourcematch\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"|\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;32m~\\anaconda3\\lib\\sre_parse.py\u001b[0m in \u001b[0;36m_parse\u001b[1;34m(source, state, verbose, nested, first)\u001b[0m\n\u001b[0;32m    666\u001b[0m                 \u001b[0mitem\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;32mNone\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    667\u001b[0m             \u001b[1;32mif\u001b[0m \u001b[1;32mnot\u001b[0m \u001b[0mitem\u001b[0m \u001b[1;32mor\u001b[0m \u001b[0mitem\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m]\u001b[0m \u001b[1;32mis\u001b[0m \u001b[0mAT\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m--> 668\u001b[1;33m                 raise source.error(\"nothing to repeat\",\n\u001b[0m\u001b[0;32m    669\u001b[0m                                    source.tell() - here + len(this))\n\u001b[0;32m    670\u001b[0m             \u001b[1;32mif\u001b[0m \u001b[0mitem\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m]\u001b[0m \u001b[1;32min\u001b[0m \u001b[0m_REPEATCODES\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31merror\u001b[0m: nothing to repeat at position 0"
     ]
    }
   ],
   "source": [
    "re.match(pattern, m4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 123,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<re.Match object; span=(0, 13), match='+919876543210'>"
      ]
     },
     "execution_count": 123,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "pattern = '^[+]91[6789]\\d{9}'\n",
    "\n",
    "\n",
    "re.match(pattern, m4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 124,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "None\n"
     ]
    }
   ],
   "source": [
    "m3 = '+9164578d9656'\n",
    "\n",
    "print(re.match(pattern, m3))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### task\n",
    "\n",
    "\n",
    "### userName@domain.extension\n",
    "\n",
    "\n",
    "- userName\n",
    "    - a-zA-Z0-9._\n",
    "    - it shouldn't startwith .\n",
    "    - min 8 max 15\n",
    "- @\n",
    "- Domain\n",
    "    - a-zA-Z0-9\n",
    "    - min 2 max 10\n",
    "- Extension\n",
    "    - a-zA-Z\n",
    "    - 2, 5"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### sub -> replace\n",
    "\n",
    "### syntax\n",
    "\n",
    "sub(Pat, repla, string)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 125,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Python-is-an-interpreted-high-level-general-purpose-programming-language.-Python's-design-philosophy-emphasizes-code-readability-with-its-notable-use-of-significant-indentation.-Wikipedia-Developer:-Python-Software-Foundation-Stable-release:-3.9.5-/-3-May-2021;-29-days-ago-Preview-release:-3.10.0b1-/-3-May-2021;-29-days-ago-Typing-discipline:-Duck,-dynamic,-strong-typing;-gradual-(since-3.5,-but-ignored-in-CPython)-First-appeared:-February-1991;-30-years-ago-Paradigm:-Multi-paradigm:-object-oriented,-procedural-(imperative),-functional,-structured,-reflective\n"
     ]
    }
   ],
   "source": [
    "print(re.sub('\\s', '-', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 126,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Python is an interpreted high-level general-purpose programming language. Python's design philosophy emphasizes code readability with its notable use of significant indentation. Wikipedia\n",
      "Developer: Python Software Foundation\n",
      "Stable release: 0.0.0 / 0 May 0000; 00 days ago\n",
      "Preview release: 0.00.0b0 / 0 May 0000; 00 days ago\n",
      "Typing discipline: Duck, dynamic, strong typing; gradual (since 0.0, but ignored in CPython)\n",
      "First appeared: February 0000; 00 years ago\n",
      "Paradigm: Multi-paradigm: object-oriented, procedural (imperative), functional, structured, reflective\n"
     ]
    }
   ],
   "source": [
    "print(re.sub('\\d', '0', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 127,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(\"Python is an interpreted high-level general-purpose programming language. Python's design philosophy emphasizes code readability with its notable use of significant indentation. Wikipedia\\nDeveloper: Python Software Foundation\\nStable release: 0.0.0 / 0 May 0000; 00 days ago\\nPreview release: 0.00.0b0 / 0 May 0000; 00 days ago\\nTyping discipline: Duck, dynamic, strong typing; gradual (since 0.0, but ignored in CPython)\\nFirst appeared: February 0000; 00 years ago\\nParadigm: Multi-paradigm: object-oriented, procedural (imperative), functional, structured, reflective\", 30)\n"
     ]
    }
   ],
   "source": [
    "print(re.subn('\\d', '0', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 128,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Python***is***an***interpreted***high***level***general***purpose***programming***language******Python***s***design***philosophy***emphasizes***code***readability***with***its***notable***use***of***significant***indentation******Wikipedia***Developer******Python***Software***Foundation***Stable***release******3***9***5*********3***May***2021******29***days***ago***Preview***release******3***10***0b1*********3***May***2021******29***days***ago***Typing***discipline******Duck******dynamic******strong***typing******gradual******since***3***5******but***ignored***in***CPython******First***appeared******February***1991******30***years***ago***Paradigm******Multi***paradigm******object***oriented******procedural******imperative*********functional******structured******reflective\n"
     ]
    }
   ],
   "source": [
    "print(re.sub('\\W', '***', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 130,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "****** ** ** *********** ********** *************** *********** ********* ******** ****** ********** ********** **** *********** **** *** ******* *** ** *********** ************ *********\n",
      "********** ****** ******** **********\n",
      "****** ******** ***** * * *** ***** ** **** ***\n",
      "******* ******** ******** * * *** ***** ** **** ***\n",
      "****** *********** ***** ******** ****** ******* ******* ****** **** *** ******* ** ********\n",
      "***** ********* ******** ***** ** ***** ***\n",
      "********* *************** **************** ********** ************* *********** *********** **********\n"
     ]
    }
   ],
   "source": [
    "print(re.sub('\\S', '*', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 131,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "('****** ** ** *********** ********** *************** *********** ********* ******** ****** ********** ********** **** *********** **** *** ******* *** ** *********** ************ *********\\n********** ****** ******** **********\\n****** ******** ***** * * *** ***** ** **** ***\\n******* ******** ******** * * *** ***** ** **** ***\\n****** *********** ***** ******** ****** ******* ******* ****** **** *** ******* ** ********\\n***** ********* ******** ***** ** ***** ***\\n********* *************** **************** ********** ************* *********** *********** **********', 492)\n"
     ]
    }
   ],
   "source": [
    "print(re.subn('\\S', '*', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 132,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(\"Pyth*n *s *n *nt*rpr*t*d h*gh-l*v*l g*n*r*l-p*rp*s* pr*gr*mm*ng l*ng**g*. Pyth*n's d*s*gn ph*l*s*phy *mph*s*z*s c*d* r**d*b*l*ty w*th *ts n*t*bl* *s* *f s*gn*f*c*nt *nd*nt*t**n. W*k*p*d**\\nD*v*l*p*r: Pyth*n S*ftw*r* F**nd*t**n\\nSt*bl* r*l**s*: 3.9.5 / 3 M*y 2021; 29 d*ys *g*\\nPr*v**w r*l**s*: 3.10.0b1 / 3 M*y 2021; 29 d*ys *g*\\nTyp*ng d*sc*pl*n*: D*ck, dyn*m*c, str*ng typ*ng; gr*d**l (s*nc* 3.5, b*t *gn*r*d *n CPyth*n)\\nF*rst *pp**r*d: F*br**ry 1991; 30 y**rs *g*\\nP*r*d*gm: M*lt*-p*r*d*gm: *bj*ct-*r**nt*d, pr*c*d*r*l (*mp*r*t*v*), f*nct**n*l, str*ct*r*d, r*fl*ct*v*\", 163)\n"
     ]
    }
   ],
   "source": [
    "print(re.subn('[aeiou]', '*', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 134,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "('****o* i* a* i**e***e*e* *i****e*e* *e*e*a***u**o*e **o**a**i** *a**ua*e* ****o*** *e*i** **i*o*o*** e***a*i*e* *o*e *ea*a*i*i** *i** i** *o*a**e u*e o* *i**i*i*a** i**e**a*io** *i*i*e*ia\\n*e*e*o*e** ****o* *o***a*e *ou**a*io*\\n**a**e *e*ea*e* ***** * * *a* ***** ** *a** a*o\\n**e*ie* *e*ea*e* ******** * * *a* ***** ** *a** a*o\\n***i** *i**i**i*e* *u*** ***a*i** ***o** ***i*** **a*ua* **i**e **** *u* i**o*e* i* *****o**\\n*i*** a**ea*e** *e**ua** ***** ** *ea** a*o\\n*a*a*i*** *u**i**a*a*i*** o**e***o*ie**e** **o*e*u*a* *i**e*a*i*e** *u***io*a** ***u**u*e** *e**e**i*e', 329)\n"
     ]
    }
   ],
   "source": [
    "print(re.subn('[^aeiou\\s]', '*', s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 135,
   "metadata": {},
   "outputs": [],
   "source": [
    "d1 = 'abc'\n",
    "d2 = 'a'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 141,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['abc']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z][a-z]+', d2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 142,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[]\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z][a-z]+', d2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 140,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['a']\n"
     ]
    }
   ],
   "source": [
    "print(re.findall('[a-z][a-z]*', d2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 143,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'{abs:val}'"
      ]
     },
     "execution_count": 143,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "'{abs:val}'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 145,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(\"Python@is@an@interpreted@high-level@general-purpose@programming@language.@Python's@design@philosophy@emphasizes@code@readability@with@its@notable@use@of@significant@indentation.@Wikipedia@Developer:@Python@Software@Foundation@Stable@release:@3.9.5@/@3@May@2021;@29@days@ago@Preview@release:@3.10.0b1@/@3@May@2021;@29@days@ago@Typing@discipline:@Duck,@dynamic,@strong@typing;@gradual@(since@3.5,@but@ignored@in@CPython)@First@appeared:@February@1991;@30@years@ago@Paradigm:@Multi-paradigm:@object-oriented,@procedural@(imperative),@functional,@structured,@reflective\", 73)\n"
     ]
    }
   ],
   "source": [
    "print(re.subn('[^aeiou\\S]','@',s))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "\\s -> [^\\S]"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.8.3"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
}