Opened 9 years ago

Closed 9 years ago

#6333 closed (wontfix)

urlresolvers.resolve barfs on regexps with a flag group

Reported by: leif@… Owned by: nobody
Component: Core (Other) Version: master
Severity: Keywords:
Cc: Triage Stage: Ready for checkin
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: UI/UX:


I think I've just run across a small bug with the reverse() method in for URLs that contain a flag group (like (?u)). To replicate, construct a urlconf containing a regexp with a flag group, e.g.

  url(r'(?u)^foo/(?P<id>\d+)/$', name='foo-url')

and then use django.core.urlresolvers.reverse to construct a url with parameters:

  reverse('foo-url', kwargs=dict(id=12))

I get a NoMatchError here (not enough positional arguments), but I don't if I remove the flag group at the beginning of the url regexp.

I've attached a small patch for this issue ; the Python re docs state that a flag group should be the first non-whitespace content in the regexp, so I only cover that case.

Attachments (2)

django-regexp-flags.diff (1.2 KB) - added by leif@… 9 years ago.
django-regexp-flags.2.diff (1.3 KB) - added by leif@… 9 years ago.

Download all attachments as: .zip

Change History (5)

Changed 9 years ago by leif@…

comment:1 Changed 9 years ago by leif@…

  • Needs documentation unset
  • Needs tests unset
  • Patch needs improvement unset

Sorry, I just re-read the Python re docs and I realized only the x flag has to be at the beginning of the regexp. I've updated the patch to ignore all flag groups in the url regexp.

Changed 9 years ago by leif@…

comment:2 Changed 9 years ago by Simon Greenhill <dev@…>

  • Triage Stage changed from Unreviewed to Ready for checkin

comment:3 Changed 9 years ago by mtredinnick

  • Resolution set to wontfix
  • Status changed from new to closed

Not worth fixing quite like this. Firstly, in this particular case, you don't need the "u" flag, since all of those matches are done with re.UNICODE being used. Secondly, a rewrite of that portion of the code is in progress that fixes things a bit more holistically.

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