nbsource/regular-expressions.ipynb

{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "#### PRE-RELEASE REVIEW: O'Reilly Intermediate Python Video Series\n",
        "#### Topic: Regular Expressions\n",
        "Source located in `nbsource/regular-expressions.ipynb`. Automatically rendered from `UNKNOWN` on 2014-03-21 at 10:21:36.572700.\n",
        "#### AUTOMATICALLY GENERATED TEST NOTEBOOK - CHANGES WILL BE LOST\n",
        "#### To TEST this Notebook<br />1. select Cell | Run All, or step through with Shift/Enter<br />2. Notebook turns pink when testing starts<br />3. It turns white when the it runs to completion.<br />4. Please check the executed notebook for clarity and correctness.<br />Please [raise an issue](https://github.com/holdenweb/intermediate-python/issues) about anything you don't understand - by all means attach a saved copy of the notebook to add explanations or questions. Also please let us know about stuff you want to see covered under any heading in the outline.\n",
        "#### Your comments on the content are also welcome, particularly when [reported as issues](https://github.com/holdenweb/intermediate-python/issues)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "# <img src=\"https://dl.dropboxusercontent.com/u/6117375/intermediate-notebooks/title_graphic.png\" /> ||| WORKING COPY ||| Regular Expressions"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "This document was created on 2014-03-13 at 15:02:41.061830."
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 1,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "import re"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 2,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "[n for n in dir(re) if not n.startswith(\"_\")]"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 3,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.match(\"a\", \"bbb\") # fails\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 4,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.match(\"a\", \"aaa\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 5,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "[n for n in dir(mo) if not n.startswith(\"_\")]"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 6,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print(mo.end())"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 7,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.match(\"a\", \"bbbaaa\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 8,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.search(\"a\", \"bbbaaa\") #not anchored\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 9,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print(mo.start(), mo.end())"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 10,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print('bbbaaa'[mo.start():mo.end()])"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 11,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.search(\"baa\", \"bbbaaa\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 12,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print('bbbaaa'[mo.start():mo.end()])"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 13,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.search(\"a*\", \"bbbaaa\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 14,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print('bbbaaa'[mo.start():mo.end()]) # why no output?"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 15,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print(mo.start(), mo.end())"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 16,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.match(\"a+\", \"bbbaaa\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 17,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.search(\"a+\", \"bbbaaa\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 18,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print(mo.start(), mo.end())"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 19,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.match(\"b+a+\", \"bbbaaa\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 20,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print('bbbaaa'[mo.start():mo.end()])"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 21,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo.groups()"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 22,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.match(\"(b+)(a+)\", \"bbbaaa\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 23,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print(mo.groups())"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 24,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "print(mo.groups(1))"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 25,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.match(\"(?P<one>b+)(a+)\", \"bbbaaa\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 26,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo.groups()"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 27,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo.group(\"one\")"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 28,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo.group(1) # Counting is from one!"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 29,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo.group(2)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 30,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "for s in \"abc1234\":\n",
        "    mo = re.match(\"\\d+\", s)\n",
        "    if mo:\n",
        "        print(s, \":\", mo.start(), mo.end())\n",
        "    else:\n",
        "        print(s, \":\", \"no match\")"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 31,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "\"abc1234\"[mo.start():mo.end()]"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 32,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo.groups()"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 33,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "for s in \"abc1234\":\n",
        "    mo = re.match(\"\\d+$\", s)\n",
        "    if mo:\n",
        "        print(s, \":\", mo.start(), mo.end())\n",
        "    else:\n",
        "        print(s, \":\", \"no match\")"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 34,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "s = \"abc1234\"\n",
        "mo = re.search(r\"\\d+\", s)\n",
        "if mo:\n",
        "    print(s, \":\", mo.start(), mo.end())\n",
        "else:\n",
        "    print(s, \":\", \"no match\")"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 35,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo.start()"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 36,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.match(\"(\\d+)\\D+(\\d+)\", \"ajax123bananas456\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 37,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.search(\"(\\d+)\\D+(\\d+)\", \"ajax123bananas456\")\n",
        "print(mo)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 38,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo.groups()"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 39,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "name_pat = \"([A-Z][a-z]*)\""
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 40,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.match(name_pat, \"Steve Holden\")\n",
        "print(mo.string, mo.groups())"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 41,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "name_pat = \"(([A-Z][a-z]*)(\\s|$))+\" # Group matches twice\n",
        "mo = re.match(name_pat, \"Steve Holden\")\n",
        "print(mo.string, mo.groups())"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 42,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "mo = re.search(\"(\\d+)\", \"Word: 'this', number: 1234, etc.\")\n",
        "print(mo.groups())"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 43,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": [
        "help(re.template)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": []
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "prompt_number": "",
      "source": []
    }
  ],
  "metadata": {},
  "nbformat": 4,
  "nbformat_minor": 0
}