Python deprecated usage of flags not at the start of a regular expression
[0], e.g. 'CaseInsensitive(?i)' instead of '(?i)CaseInsensitive'.
Deprecation warnings shows up in a few URL tests that are using (?i) to get
case-insensitive matching of URLpatterns. However, because the URL resolver
prefixes '^/' [or get_script_prefix()] to all patterns [1], the warning
happens even if the regex group is at the start of a urlpattern, e.g.
/home/tim/code/django/django/urls/resolvers.py:464: DeprecationWarning:
Flags not at the start of the expression ^\/(?i)CaseInsensiti (truncated)
if re.search('^%s%s' % (re.escape(_prefix), pattern), candidate_pat %
candidate_subs, re.UNICODE):
A better sense of what's affected can be seen on my PR that removes support
for the ignored groups [2]. All this landed in 2008 in Malcolm's rewrite of
URL parsing [3].
I'm not sure if any of these groups are used in URLpatterns in the wild or
if it's okay to proceed with the removal. To keep the feature, I imagine
Django would need to do some extraction of flags from URLpatterns and put
them at the start of patterns, but I'm not too sure.
Thanks for your feedback.
[0] http://bugs.python.org/issue22493
[1]
https://github.com/django/django/blob/5d28fef8f9329e440ee67cefc900dbf89f4c524c/django/urls/resolvers.py#L464
[2] https://github.com/django/django/pull/7701
[3]
https://github.com/django/django/commit/a63a83e5d88cd1696d1c40e89f254f69116c6800
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