And on further investigation, I'm not sure how to fix the deprecation warnings in Django. We have a urlpattern like this:

  url(r'^(?i)CaseInsensitive/(\w+)', empty_view, name="insensitive"),

The regex string r'^(?i)CaseInsensitive/(\w+)' is later substituted in this line in Django's URL resolver as the `pattern`:

if re.search('^%s%s' % (re.escape(_prefix), pattern), candidate_pat % candidate_subs, re.UNICODE):

It seems Django would need to extract any flags from `pattern` and put them at the start of the '^%s%s' string that's constructed for re.search(). I'm not sure if this can be done easily.