正则表达式匹配次数 [英] Number of regex matches

问题描述

我正在使用 re 模块中的 finditer 函数来匹配某些内容，并且一切正常.

I'm using the finditer function in the re module to match some things and everything is working.

现在我需要找出我有多少匹配项.是否可以不循环遍历迭代器两次?(先找出计数，然后才是真正的迭代)

Now I need to find out how many matches I've got. Is it possible without looping through the iterator twice? (one to find out the count and then the real iteration)

一些代码:

imageMatches = re.finditer("<img src\=\"(?P<path>[-/\w\.]+)\"", response[2])
# <Here I need to get the number of matches>
for imageMatch in imageMatches:
    doStuff

一切正常，我只需要在循环之前获取匹配数.

Everything works, I just need to get the number of matches before the loop.

推荐答案

如果您知道需要所有匹配项，您可以使用 re.findall 函数.它将返回所有匹配项的列表.然后你可以对匹配的数量做 len(result).

If you know you will want all the matches, you could use the re.findall function. It will return a list of all the matches. Then you can just do len(result) for the number of matches.

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