Question

我有以下声明的文件。

start < some 50 words > End          //need to work only on these types
start < some 50 words >
start < some 50 words > End
start < some 50 words > 
< some 50 words > End

...此模式重复10000次。我想用

替换在开头'和'结尾'开头的行

start2 <same 50 words > End2.

我需要在两者之间保持相同的单词只需修改开始和结束。

Answer 1

import re

data = """start < some 50 words > End
start < some 50 words >
start < some 50 words > End
start < some 50 words >
< some 50 words > End
"""

print re.sub('start(.*)End', 'start2\g<1>End.', data)

打印：

start2 < some 50 words > End.
start < some 50 words >
start2 < some 50 words > End.
start < some 50 words >
< some 50 words > End

Answer 2

正则表达式比你需要解决这个问题更多的工作 - 使用普通的旧字符串方法可以更简单地完成：

def ReplaceStartEnd(s):
...    if s.startswith("start") and s.endswith("End"):
...       return "start2" + s[5:-3] + "End2"
...    else:
...       return s

搜索所需的正则表达式模式和python函数

2 个答案: