Adapted Felix's regex koans to work with the larger suite

python 2/koans/about_regex.py

@@ -5,7 +5,7 @@
 import re
 class AboutRegex(Koan):
     """
-        This koans are based on the Ben's book: Regular Expressions in 10 minutes.
+        These koans are based on the Ben's book: Regular Expressions in 10 minutes.
         I found this books very useful so I decided to write a koans in order to practice everything I had learned from it.
         http://www.forta.com/books/0672325667/
     """
@@ -33,7 +33,9 @@ def test_matching_literal_text_how_many(self):
         """
         string = "Hello, my name is Felix and this koans are based on the Ben's book: Regular Expressions in 10 minutes. Repeat My name is Felix"
         m = re.match('Felix', string) #TIP: Maybe match it's not the best option
-        self.assertEqual(len(m),2, "I want to know how many times appears my name")
+
+        # I want to know how many times appears my name
+        self.assertEqual(m, __)
 
     def test_matching_literal_text_not_case_sensitivity(self):
         """
@@ -43,8 +45,10 @@ def test_matching_literal_text_not_case_sensitivity(self):
             In Ben's book you can see more languages.
 
         """
-        string = "Hello, my name is Felix or felix and this koans are based on the Ben's book: Regular Expressions in 10 minutes."
-        self.assertEqual(len(re.findall("felix", string,__)),2, "I want my name")
+        string = "Hello, my name is Felix or felix and this koans is based on the Ben's book: Regular Expressions in 10 minutes."
+
+        self.assertEqual(re.findall("felix", string, 20), __)
+        self.assertEqual(re.findall("felix", string, 10), __)
 
     def test_matching_any_character(self):
         """
@@ -59,25 +63,10 @@ def test_matching_any_character(self):
                 + "na2.xls\n"     \
                 + "sa1.xls"
 
-        #TIP: remember the issue of this lesson
-        self.assertEquals(len(re.findall(__, string)),3, "I want to find all files for North America(na) or South America(sa)")
-
-    def test_matching_special_character(self):
-        """
-            Lesson 1 Matching special character
-
-            Uses \ if you want to match special character
-        """
-        string = "sales.xlx\n"    \
-                + "sales1.xls\n"  \
-                + "orders1.xls\n" \
-                + "apac1.xls\n" \
-                + "sales2.xls\n"  \
-                + "na1.xls\n"  \
-                + "na2.xls\n"  \
-                + "sa1.xls"  
-        #TIP you can use the pattern .a. which matches in above test but in this case matches more than you want
-        self.assertEquals(len(re.findall(__, string)),3, "I want to find all files for North America(na) or South America(sa)")
+        # TIP: remember the name of this lesson
+
+        change_this_search_string = 'a..xlx' # <-- I want to find all uses of myArray
+        self.assertEquals(len(re.findall(change_this_search_string, string)),3)
 
     def test_matching_set_character(self):
         """
@@ -95,47 +84,10 @@ def test_matching_set_character(self):
                 + "na2.xls\n"  \
                 + "sa1.xls\n"  \
                 + "ca1.xls"  
-        #TIP you can use the pattern .a. which matches in above test but in this case matches more than you want
-        self.assertEquals(len(re.findall(__, string)),3, "I want to find all files for North America(na) or South America(sa), but not (ca)")
-
-    def test_using_character_set_ranges(self):
-        """
-            Lesson 2 Using character set ranges
-
-            The previous pattern could be [ns]a.\.xls and if a in the list had a file name sam.xls would be matched because the . matches all 
-            characters, not just digits. This can be solved with Character sets.
-            You can use  this pattern [ns]a[0123456789]\.xls but to simplify you can use a special metacharacter: - (hyphen). i.e [0-9]
-
-            - is only a metacharacter when used between [].
-
-        """
-        string = "sales.xlx\n"    \
-                + "sales1.xls\n"  \
-                + "orders3.xls\n" \
-                + "apac1.xls\n" \
-                + "sales2.xls\n"  \
-                + "na1.xls\n"  \
-                + "na2.xls\n"  \
-                + "sa1.xls\n"  \
-                + "sam.xls\n"  \
-                + "ca1.xls"  
-        self.assertEquals(len(re.findall(__, string)),3, "I want to find all files for North America(na) or South America(sa), but not (ca)")
-
-    def test_using_multiple_ranges(self):
-        """
-            Lesson 2 Using character set ranges
-
-            The following are valid ranges:
-                A-Z matches all uppercase characters from A to Z
-                a-z matches all uppercase characters from a to z
-                A-F matches all uppercase characters from A to F
-                A-z matches all uppercase characters from A to z. This pattern also includes characters such as [ and ^
-                Any two ASCII characters may be specified as the range start and end.
-
-        """
-        string = '<BODY BGCOLOR="#336633" TEXT="#FFFFFF" MARGINWIDTH="0" MARGINHEIGHT="0" TOPMARGIN="0" LEFTMARGIN="0">'
-        self.assertEquals(len(re.findall(__, string)),2, "I want to find all the colors in RGB")
-
+        # I want to find all files for North America(na) or South America(sa), but not (ca)
+        # TIP you can use the pattern .a. which matches in above test but in this case matches more than you want
+        change_this_search_string = '[nsc]a[2-9].xls'
+        self.assertEquals(len(re.findall(change_this_search_string, string)),3)
 
     def test_anything_but_matching(self):
         """
@@ -156,83 +108,9 @@ def test_anything_but_matching(self):
                 + "na2.xls\n"  \
                 + "sa1.xls\n"  \
                 + "ca1.xls"  
-        m = re.search(__, string)
-        self.assertTrue(m and m.group(0) and m.group(0)== 'sam.xls', "I want to find the name sam")
 
-    def using_metacharacters_escaping(self):
-        """
-            Lesson 3 Using metacharacters
+        # I want to find the name sam 
+        change_this_search_string = '[^nc]am'
+        self.assertEquals(re.findall(change_this_search_string, string), ['sam.xls'])        
 
-            Metacharacters are characters that have special meaning within regular expressions.
-            
-            Metacharacters can be escaped by preceding them with a backslash, therefore \. matches . 
-        """
-        string = "var myArray = new Array();\n"    \
-                + "if (myArray[0]) { \n"  \
-                + "}" 
-        m = re.search("myArray[0]", string) #TIP: This pattern  matches "myArray0" because [ and ] are metacharacters
-        self.assertTrue(m and m.group(0) and m.group(0)== 'myArray[0]', "I want to find myArray[0]")
 
-    def using_metacharacters_matching_white_spaces(self):
-        """
-            Lesson 3 Matching whitespace character
-
-            Sometimes you'll have to match nonprinting whitespace characters embedded in your text. For example tab characters
-            or line breaks .
-            In this cases you can use these special metacharacters: 
-                [\b]   Backspace
-                \f     Form feed
-                \n     Line feed
-                \r     Carriage return
-                \t     Tab
-                \v     Vertical tab
-            
-        """
-        f = open('koans/regex_cvs', 'r')
-        string = f.read()
-        #This text contains a series of records in comma-delimited format (cvs). Before processing the records, you need
-        # to remove any blank lines in the data. 
-        m = re.search("", string)         
-        self.assertTrue(m and m.group(0) and m.group(0)== '\n\n', "I want to find the blank lines")
-
-    def using_metacharacters_matching_digits(self):
-        """
-            Lesson 3 Using metacharacters
-
-            As you have seen in Lesson 2, [0-9] is a shorcut for [0123456789] and is used to match any digit. 
-            To match anything other than a digit, the set can be negated as [^0-9].
-            With the next metacharacters you can do the same:
-                \d match any digit (same as [0-9])
-                \D match any nondigit (same as [0-9])
-        """
-        string = "var myArray = new Array();\n"    \
-                + "if (myArray[0]) { \n"  \
-                + "    alert('Learning regex'); \n" \
-                + "} \n"   \
-                + "if (myArray[1]) { \n"  \
-                + "    alert('With this great book');\n" \
-                + "} \n"  
-
-        self.assertEquals( len(re.findall(__, string)), 2, "I want to find all uses of myArray")
-
-
-    def using_metacharacters_matching_alphanumeric_characters(self):
-        """
-            Lesson 3 Using metacharacters
-
-            Like with the digits you have special characters for alphanumeric characters:
-                \w Any alphanumeric character in uppercase or lowercase and underscore: [a-zA-Z0-9_]
-                \W Any nonalphanumeric or underscore character: [^a-zA-Z0-9_]
-            
-            Here you have a list of IDs made of 3 characters/digits/underscores, 1 hyphen and 3 characters/digits/underscores: 
-                A1A-B_A or BA_-2e3 or 1_2-34R
-        """
-        string = "A_1-DRA\n" \
-                +"A01-2ER\n" \
-                +"A01-(4d\n" \
-                +"B11=223\n" \
-                +"A1A-B_A\n" \
-                +"1_2-34R\n" \
-                +"BA_-2e3"
-
-        self.assertEquals( len(re.findall(__, string)), 5, "I want to find the ids") 

python 2/runner/path_to_enlightenment.py

@@ -33,6 +33,7 @@
 from koans.about_decorating_with_classes import AboutDecoratingWithClasses
 from koans.about_inheritance import AboutInheritance
 from koans.about_multiple_inheritance import AboutMultipleInheritance
+from koans.about_regex import AboutRegex
 from koans.about_scope import AboutScope
 from koans.about_modules import AboutModules
 from koans.about_packages import AboutPackages

python 3/koans/about_regex.py

@@ -0,0 +1,116 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from runner.koan import *
+import re
+class AboutRegex(Koan):
+    """
+        These koans are based on the Ben's book: Regular Expressions in 10 minutes.
+        I found this books very useful so I decided to write a koans in order to practice everything I had learned from it.
+        http://www.forta.com/books/0672325667/
+    """
+
+    def test_matching_literal_text(self):
+        """
+            Lesson 1 Matching Literal String
+        """
+        string = "Hello, my name is Felix and this koans are based on the Ben's book: Regular Expressions in 10 minutes."
+        m = re.search(__, string)
+        self.assertTrue(m and m.group(0) and m.group(0)== 'Felix', "I want my name")
+
+    def test_matching_literal_text_how_many(self):
+        """
+            Lesson 1 How many matches?
+
+            The default behaviour of most regular extression engines is to return just the first match.
+            In python you have the next options:
+
+                match()    -->  Determine if the RE matches at the beginning of the string.
+                search()   -->  Scan through a string, looking for any location where this RE matches.
+                findall()  -->  Find all substrings where the RE matches, and returns them as a list.
+                finditer() -->  Find all substrings where the RE matches, and returns them as an iterator.
+                
+        """
+        string = "Hello, my name is Felix and this koans are based on the Ben's book: Regular Expressions in 10 minutes. Repeat My name is Felix"
+        m = re.match('Felix', string) #TIP: Maybe match it's not the best option
+
+        # I want to know how many times appears my name
+        self.assertEqual(m, __)
+
+    def test_matching_literal_text_not_case_sensitivity(self):
+        """
+            Lesson 1 Matching Literal String non case sensitivity.
+            Most regex implementations also support matches that are not case sensitive. In python you can use re.IGNORECASE, in
+            Javascript you can specify the optional i flag.
+            In Ben's book you can see more languages.
+
+        """
+        string = "Hello, my name is Felix or felix and this koans is based on the Ben's book: Regular Expressions in 10 minutes."
+
+        self.assertEqual(re.findall("felix", string, 20), __)
+        self.assertEqual(re.findall("felix", string, 10), __)
+
+    def test_matching_any_character(self):
+        """
+            Lesson 1 Matching any character
+
+            . matches any character, alphabetic characters, digits and .
+        """
+        string = "pecks.xlx\n"    \
+                + "orders1.xls\n" \
+                + "apec1.xls\n"   \
+                + "na1.xls\n"     \
+                + "na2.xls\n"     \
+                + "sa1.xls"
+
+        # TIP: remember the name of this lesson
+
+        change_this_search_string = 'a..xlx' # <-- I want to find all uses of myArray
+        self.assertEquals(len(re.findall(change_this_search_string, string)),3)
+
+    def test_matching_set_character(self):
+        """
+            Lesson 2 Matching sets of characters
+
+            A set of characters is defined using the metacharacters [ and ]. Everything between them is part of the set and
+            any one of the set members must match (but not all).
+        """
+        string = "sales.xlx\n"    \
+                + "sales1.xls\n"  \
+                + "orders3.xls\n" \
+                + "apac1.xls\n" \
+                + "sales2.xls\n"  \
+                + "na1.xls\n"  \
+                + "na2.xls\n"  \
+                + "sa1.xls\n"  \
+                + "ca1.xls"  
+        # I want to find all files for North America(na) or South America(sa), but not (ca)
+        # TIP you can use the pattern .a. which matches in above test but in this case matches more than you want
+        change_this_search_string = '[nsc]a[2-9].xls'
+        self.assertEquals(len(re.findall(change_this_search_string, string)),3)
+
+    def test_anything_but_matching(self):
+        """
+            Lesson 2 Using character set ranges
+            Occsionally, you'll want a list of characters that you don't want to match. 
+            Character sets can be negated using the ^ metacharacter.
+
+        """
+        string = "sales.xlx\n"    \
+                + "sales1.xls\n"  \
+                + "orders3.xls\n" \
+                + "apac1.xls\n" \
+                + "sales2.xls\n"  \
+                + "sales3.xls\n"  \
+                + "europe2.xls\n"  \
+                + "sam.xls\n"  \
+                + "na1.xls\n"  \
+                + "na2.xls\n"  \
+                + "sa1.xls\n"  \
+                + "ca1.xls"  
+
+        # I want to find the name sam 
+        change_this_search_string = '[^nc]am'
+        self.assertEquals(re.findall(change_this_search_string, string), ['sam.xls'])        
+
+

python 3/runner/path_to_enlightenment.py

@@ -32,6 +32,7 @@
 from koans.about_decorating_with_classes import AboutDecoratingWithClasses
 from koans.about_inheritance import AboutInheritance
 from koans.about_multiple_inheritance import AboutMultipleInheritance
+from koans.about_regex import AboutRegex
 from koans.about_scope import AboutScope
 from koans.about_modules import AboutModules
 from koans.about_packages import AboutPackages