python正则表达式re模块详解

快速入门

import repattern = 'this'text = 'Does this text match the pattern?'match = re.search(pattern, text)s = match.start()e = match.end()print('Found "{0}"/nin "{1}"'.format(match.re.pattern, match.string))print('from {0} to {1} ("{2}")'.format( s, e, text[s:e]))

执行结果：

#python re_simple_match.py Found "this"in "Does this text match the pattern?"from 5 to 9 ("this")import re# Precompile the patternsregexes = [ re.compile(p) for p in ('this', 'that')]text = 'Does this text match the pattern?'print('Text: {0}/n'.format(text))for regex in regexes:  if regex.search(text):    result = 'match!'  else:    result = 'no match!'      print('Seeking "{0}" -> {1}'.format(regex.pattern, result))

执行结果：

#python re_simple_compiled.py Text: Does this text match the pattern?Seeking "this" -> match!Seeking "that" -> no match!import retext = 'abbaaabbbbaaaaa'pattern = 'ab'for match in re.findall(pattern, text):  print('Found "{0}"'.format(match))

执行结果：

#python re_findall.py Found "ab"Found "ab"import retext = 'abbaaabbbbaaaaa'pattern = 'ab'for match in re.finditer(pattern, text):  s = match.start()  e = match.end()  print('Found "{0}" at {1}:{2}'.format(text[s:e], s, e))

执行结果：

#python re_finditer.py Found "ab" at 0:2Found "ab" at 5:7