regex in Django urls.py

Question

Help me please to fix urls.py People suggested this way, but it does't work for me.....

#urls.py
  (r'^/user/(?P<username>)/subject/([\w|\W]+)/$', subject),

#template
 {% for subject in subjects %}
    <li><a href="/user/{{ user.username }}/subject/{{ subject.name }}">{{ subject.name }}</a> {{ del_form.delete }}</li>
 {% endfor %}

#error
PAGE NOT FOUND
Request URL:    http://127.0.0.1:8000/user/root/subject/Math%20140
....
....
^/user/(?P<username>)/subject/([\w|\W]+)/$

I don't know about django, but your regex requires the URL to end in a /, and your test URL (127.0.0.1....MATH%20140) does not end in a /. You could make it optional or remove it. Also, [\w|\W]+ should be [\w\W]+ since | doesn't mean anything in the []. (Why not just do .+ then? You are including new lines in [\w\W] whereas . does not) — mathematical.coffee
– mathematical.coffee, Commented Jul 23, 2012 at 23:36
To some extent, that also depends on whether or not the multiline flag (m) is set, which I don't think it is. A secondary issue might be that the URL is url-encoded, whereas the subject is probably not. — Steve Wang
– Steve Wang, Commented Jul 23, 2012 at 23:38
Django by default adds trailing slashes to URLs. The url-encoding issue would probably be best handled by adding a subject slug that doesn't include spaces etc, or using the slugify filter (and attempting to invert in the view - probably best to just add an actual SlugField to avoid difficulties there). — Danica
– Danica, Commented Jul 23, 2012 at 23:43

spookylukey · Accepted Answer · 2014-03-16 08:40:42Z

7

You have an error in your regular expression. You should use a regex builder if you are new to this:

http://ryanswanson.com/regexp/ (Perl)

http://www.pyregex.com/ (Python)

I think you want something like this:

^user/(?P<username>.+)/subject/([\w|\W]+)/

But you might want to change the '.+' to something more restrictive:

^user/(?P<username>[^/]+)/subject/([\w|\W]+)/

Note also that you probably don't want that leading slash - due to the way Django feeds the initial URL to the URL dispatcher.

edited Mar 16, 2014 at 8:40

answered Jul 23, 2012 at 23:40

spookylukey

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