added match whitespaces

flopezluis · flopezluis · commit ad7e6889d588 · 2011-01-27T20:20:24.000+01:00
diff --git a/python 2/koans/about_regex.py b/python 2/koans/about_regex.py
@@ -144,6 +144,42 @@ def test_anything_but_matching(self):
                 + "na2.xls\n"  \
                 + "sa1.xls\n"  \
                 + "ca1.xls"  
-        m = re.search("[ns]a[^0-9]\.xls", string)
+        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
+
+            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")
+
diff --git a/python 2/koans/regex_solutions.txt b/python 2/koans/regex_solutions.txt
@@ -14,4 +14,10 @@ test_using_character_set_ranges:
 test_using_multiple_ranges:
     #[0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f] OR #[0-9A-Fa-f]{6} but the latter will be seen later
 test_anything_but_matching:
-    [ns]a[^0-9]\.xls"
+    [ns]a[^0-9]\.xls
+using_metacharacters_escaping:
+    myArray\[0\]    
+using_metacharacters_macthing_white_spaces:
+    \n\n
+    IMPORTANT: Windows uses a carriage return line fedd combination used as an end-of-line marker, so you need to use \r\n.
+    
