Optional named groups Python re

Question

In the Django urls I need an optional named group. This conf without arguments raised an 404 exception:

r'^list_cv/(?P<category>[\d]+)?/$'

How to make optional named group?

possible duplicate of [Making a Regex Django URL Token Optional](http://stackoverflow.com/questions/2325433/making-a-regex-django-url-token-optional) — Bartek, Nov 25 '11 at 14:29

I159 · Accepted Answer · 2020-01-31T09:19:21.677

8

Works this way to me:

r'^list_cv/(?:(?P<category>[\w+])/)?$'

Comparing to the original answer the difference is in the repetition match.

(?:(?P<category>[\w+])/)?$ vs original (?:(?P<category>[\w+])?/)$.

edited Jan 31 '20 at 09:19

answered Nov 25 '11 at 15:17

I159

score 4 · Answer 2 · answered Nov 25 '11 at 14:32

4

The last slash should be part of the optional RE, and the RE should be like

r'^list_cv/(?:(?P<category>[\w+])?/)$'

I didn't test it, though.

answered Nov 25 '11 at 14:32

Mohammad Tayseer

2

This was not really working, but the third answers was working http://stackoverflow.com/a/8271065/548558 with this r'^list_cv/(?:(?P[\w+])/)?$' – Azd325 Mar 21 '12 at 14:49

score 4 · Answer 3 · answered Nov 25 '11 at 14:49

4

I find that it's more legible to create a separate url pattern for the url without the named group.

url(r'^list_cv/$', my_view),
url(r'^list_cv/(?P<category>[\d]+)/$', my_view),

answered Nov 25 '11 at 14:49

Alasdair

3 Answers3