如何用该匹配的转换替换重新匹配? [英] How to replace an re match with a transformation of that match?

问题描述

例如，我有一个字符串:

For example, I have a string:

The struct-of-application and struct-of-world

使用re.sub，它将用预定义的字符串替换匹配的字符串.如何用匹配内容的转换替换匹配?获取，例如:

With re.sub, it will replace the matched with a predefined string. How can I replace the match with a transformation of the matched content? To get, for example:

The [application_of_struct](http://application_of_struct) and [world-of-struct](http://world-of-struct)

如果我写一个简单的正则表达式 ((\w+-)+\w+) 并尝试使用 re.sub，似乎我不能使用我的匹配作为替换的一部分，更不用说编辑匹配的内容了:

If I write a simple regex ((\w+-)+\w+) and try to use re.sub, it seems I can't use what I matched as part of the replacement, let alone edit the matched content:

In [10]: p.sub('struct','The struct-of-application and struct-of-world')
Out[10]: 'The struct and struct'

推荐答案

使用 替换函数

s = 'The struct-of-application and struct-of-world'
p = re.compile('((\w+-)+\w+)')
def replace(match):
    return 'http://{}'.format(match.group())
    #for python 3.6+ ... 
    #return f'http://{match.group()}'

>>> p.sub(replace, s)

'The http://struct-of-application and http://struct-of-world'
>>>

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