python regular expression basic

stayeveryoung

于 2014-08-12 18:27:54 发布

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分类专栏： python 文章标签： python regular expression basic

本文链接：https://blog.youkuaiyun.com/u014133453/article/details/38519181

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本文通过Python脚本演示了如何使用正则表达式搜索文本并进行替换操作，包括基本的搜索模式匹配以及预编译正则表达式提高效率的方法。

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#!/usr/bin/python3
# regex.py by Bill Weinman [http://bw.org/]
# This is an exercise file from Python 3 Essential Training on lynda.com
# Copyright 2010 The BearHeart Gorup, LLC

import re

def main():
fh = open('raven.txt')
for line in fh:
if re.search('(Len|Neverm)ore', line):
print(line, end='')

if __name__ == "__main__": main()

#!/usr/bin/python3
# regex.py by Bill Weinman [http://bw.org/]
# This is an exercise file from Python 3 Essential Training on lynda.com
# Copyright 2010 The BearHeart Gorup, LLC

import re

def main():
fh = open('raven.txt')
for line in fh:
print(re.sub('(Len|Neverm)ore','###', line),end=' ')

if __name__ == "__main__": main()

------预编译

#!/usr/bin/python3
# regex.py by Bill Weinman [http://bw.org/]
# This is an exercise file from Python 3 Essential Training on lynda.com
# Copyright 2010 The BearHeart Gorup, LLC

import re

def main():
fh = open('raven.txt')
pattern=re.compile('(Len|Neverm)ore')
for line in fh:
if re.search(pattern, line):
print(pattern.sub('###',line), end='')

if __name__ == "__main__": main()