python里使用正则表达式的组嵌套实例详解

#python 3.6 #蔡军生  #http://blog.csdn.net/caimouse/article/details/51749579 # import re   def test_patterns(text, patterns):   """Given source text and a list of patterns, look for   matches for each pattern within the text and print   them to stdout.   """   # Look for each pattern in the text and print the results   for pattern, desc in patterns:     print('{!r} ({})/n'.format(pattern, desc))     print(' {!r}'.format(text))     for match in re.finditer(pattern, text):       s = match.start()       e = match.end()       prefix = ' ' * (s)       print(         ' {}{!r}{} '.format(prefix,                    text[s:e],                    ' ' * (len(text) - e)),         end=' ',       )       print(match.groups())       if match.groupdict():         print('{}{}'.format(           ' ' * (len(text) - s),           match.groupdict()),         )     print()   return 

#python 3.6 #蔡军生  #http://blog.csdn.net/caimouse/article/details/51749579 # from re_test_patterns_groups import test_patterns  test_patterns(   'abbaabbba',   [(r'a((a*)(b*))', 'a followed by 0-n a and 0-n b')], ) 

'a((a*)(b*))' (a followed by 0-n a and 0-n b) 'abbaabbba' 'abb'    ('bb', '', 'bb')   'aabbb'  ('abbb', 'a', 'bbb')     'a' ('', '', '')