[英]Capturing repeating subpatterns in Python regex
While matching an email address, after I match something like yasar@webmail
, I want to capture one or more of (\.\w+)
(what I am doing is a little bit more complicated, this is just an example), I tried adding (.\w+)+, but it only captures last match.在匹配 email 地址时,在匹配
yasar@webmail
类的内容后,我想捕获一个或多个(\.\w+)
(我所做的有点复杂,这只是一个例子),我试过了添加 (.\w+)+,但它只捕获最后一个匹配项。 For example, yasar@webmail.something.edu.tr
matches but only include .tr
after yasar@webmail
part, so I lost .something
and .edu
groups.例如,
yasar@webmail.something.edu.tr
@webmail.something.edu.tr 匹配但仅在yasar@webmail
部分之后包含.tr
,因此我丢失了.something
和.edu
组。 Can I do this in Python regular expressions, or would you suggest matching everything at first, and split the subpatterns later?我可以在 Python 正则表达式中执行此操作,还是您建议首先匹配所有内容,然后再拆分子模式?
re
module doesn't support repeated captures ( regex
supports it): re
模块不支持重复捕获( regex
支持):
>>> m = regex.match(r'([.\w]+)@((\w+)(\.\w+)+)', 'yasar@webmail.something.edu.tr')
>>> m.groups()
('yasar', 'webmail.something.edu.tr', 'webmail', '.tr')
>>> m.captures(4)
['.something', '.edu', '.tr']
In your case I'd go with splitting the repeated subpatterns later.在您的情况下,我稍后会拆分重复的子模式。 It leads to a simple and readable code eg, see the code in @Li-aung Yip's answer .
它会生成一个简单易读的代码,例如,请参阅@Li-aung Yip 的回答中的代码。
This will work:这将起作用:
>>> regexp = r"[\w\.]+@(\w+)(\.\w+)?(\.\w+)?(\.\w+)?(\.\w+)?(\.\w+)?"
>>> email_address = "william.adama@galactica.caprica.fleet.mil"
>>> m = re.match(regexp, email_address)
>>> m.groups()
('galactica', '.caprica', '.fleet', '.mil', None, None)
But it's limited to a maximum of six subgroups.但它仅限于最多六个子组。 A better way to do this would be:
一个更好的方法是:
>>> m = re.match(r"[\w\.]+@(.+)", email_address)
>>> m.groups()
('galactica.caprica.fleet.mil',)
>>> m.group(1).split('.')
['galactica', 'caprica', 'fleet', 'mil']
Note that regexps are fine so long as the email addresses are simple - but there are all kinds of things that this will break for.请注意,只要电子邮件地址很简单,regexp 就可以了 - 但是这会破坏各种事情。 See this question for a detailed treatment of email address regexes.
有关电子邮件地址正则表达式的详细处理,请参阅此问题。
您可以通过执行以下操作来解决(\\.\\w+)+
仅捕获最后一个匹配项的问题: ((?:\\.\\w+)+)
This is what you are looking for:这就是你要找的:
>>> import re
>>> s="yasar@webmail.something.edu.tr"
>>> r=re.compile("\.\w+")
>>> m=r.findall(s)
>>> m
['.something', '.edu', '.tr']
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