为什么re.groups()不给我一个正确匹配的组任何东西? [英] Why won't re.groups() give me anything for my one correctly-matched group?

问题描述

当我运行此代码时:

print re.search(r'1', '1').groups() 

我得到()的结果.但是，.group(0)给了我匹配.

I get a result of (). However, .group(0) gives me the match.

groups()不应该给我一些包含火柴的东西吗?

Shouldn't groups() give me something containing the match?

更新:感谢您的回答.因此，这意味着如果我不使用任何子组进行re.search()，我必须使用groups(0)进行匹配?

Update: Thanks for the answers. So that means if I do re.search() with no subgroups, I have to use groups(0) to get a match?

推荐答案

组为空，因为您没有任何捕获组-

groups is empty since you do not have any capturing groups - http://docs.python.org/library/re.html#re.MatchObject.groups. group(0) will always returns the whole text that was matched regardless of if it was captured in a group or not

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