python正则表达式re模块用法实例教程

import re

pattern = '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]))
 

import re

# Precompile the patterns
regexes = [ 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))
 

import re

text = '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 re

text = '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))