带问号文字的Python正则表达式 [英] Python regex with question mark literal
问题描述
我正在使用Django的URLconf,我将收到的URL是 /?code = authenticationcode
我想匹配使用 r'^ \?code =(?P
。*)$'
的URL,但这无效。
I'm using Django's URLconf, the URL I will receive is /?code=authenticationcode
I want to match the URL using r'^\?code=(?P<code>.*)$'
, but it doesn't work.
然后我发现这是‘?’问题。
因为我试图使用 r'aaa\?aaa'匹配
/ aaa?aaa
code> r'aaa\\?aaa'
甚至 r'aaa。* aaa'
,都失败了,但是当它是 +或任何其他字符时,它可以工作。
如何匹配'?',是否特别?
Then I found out it is the problem of '?'.
Becuase I tried to match /aaa?aaa
using r'aaa\?aaa'
r'aaa\\?aaa'
even r'aaa.*aaa'
, all failed, but it works when it's "+" or any other character.
How to match the '?', is it special?
推荐答案
>>> s="aaa?aaa"
>>> import re
>>> re.findall(r'aaa\?aaa', s)
['aaa?aaa']
/ aaa?aaa
在您的URL中不匹配的原因是因为?
以新的GET查询。
The reason /aaa?aaa
won't match inside your URL is because a ?
begins a new GET query.
因此,URL的可匹配部分仅取决于第一个 aaa。其余的?aaa是一个新的查询字符串,以?号分隔,其中包含一个变量 aaa作为GET参数传递。
So, the matchable part of the URL is only up to the first 'aaa'. The remaining '?aaa' is a new query string separated by the '?' mark, containing a variable "aaa" being passed as a GET parameter.
您在这里 所能做的就是在变量进入URL之前对其进行编码。 ?
的编码形式为%3F
。
What you can do here is encode the variable before it makes its way into the URL. The encoded form of ?
is %3F
.
您也不应该完全使用正则表达式来匹配GET查询,例如 /?code = authenticationcode
。而是使用 r’^ $’
将您的URL匹配到 /
。 Django会将变量 code
作为GET参数传递给 request
对象,您可以在视图中使用 request.GET.get('code')
。
You should also not match a GET query such as /?code=authenticationcode
using regex at all. Instead, match your URL up to /
using r'^$'
. Django will pass the variable code
as a GET parameter to the request
object, which you can obtain in your view using request.GET.get('code')
.
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