如何将管道运算符用作正则表达式的一部分? [英] How to use the pipe operator as part of a regular expression?

问题描述

我想匹配字符串中的网址

I want to match the url within strings like

u1 = "Check this out http://www.cnn.com/stuff lol"
u2 = "see http://www.cnn.com/stuff2"
u3 = "http://www.espn.com/stuff3 is interesting"

像下面这样的工作，但很麻烦，因为我必须重复整个模式

Something like the following works, but it's cumbersome because I have to repeat the whole pattern

re.findall("[^ ]*.cnn.[^ ]*|[^ ]*.espn.[^ ]*", u1)

特别是，在我的真实代码中，我想匹配更多的网站.理想情况下，我可以做类似的事情

Particularly, in my real code I wanted to match a much larger number of web sites. Ideally I can do something similar to

re.findall("[^ ]*.cnn|espn.[^ ]*", u1)

但当然它现在不起作用，因为我没有正确指定网站名称.这如何做得更好?谢谢.

but of course it doesn't work now because I am not specifying the web site name correctly. How can this be done better? Thanks.

推荐答案

非分组匹配.

re.findall("[^ ]*.(?:cnn|espn).[^ ]*", u1)

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