Backport of 0ed7d155 from master

Thanks tomwys for the suggestion.

Thanks Carl Meyer for the suggestion and Alex Gaynor and Carl for reviews.

Should be unneeded with Python 2.7 and up.
Added some unicode_literals along the way.

Thanks Vinay Sajip for the support of his django3 branch and
Jannis Leidel for the review.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16981 bcc190cf-cafb-0310-a4f2-bffc1f526a37

This applies to both our own [test] code and documentation examples. Also:
 * Moved the functions and handlers from `django.conf.urls.defaults` up to
   `django.conf.urls` deprecating the former module.
 * Added documentation for `handler403`.
 * Tweaked the URLs topic document a bit.

Thanks to pupeno and cdestigter for their great work contributing patches.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16818 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #13275 -- Modified the parsing logic of the {% url %} tag to avoid catastrophic backtracking. Thanks to SmileyChris for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12943 bcc190cf-cafb-0310-a4f2-bffc1f526a37

There's no guarantee about the order in which ambiguous patterns are resolved.
The solution is "don't do that" and avoid ambiguity.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9113 bcc190cf-cafb-0310-a4f2-bffc1f526a37

attempt to verify #8726.

Refs #8726.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8766 bcc190cf-cafb-0310-a4f2-bffc1f526a37

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6618 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Also included a test for non-ASCII strings in URL patterns, although that
already worked correctly.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@5630 bcc190cf-cafb-0310-a4f2-bffc1f526a37

backwards compatible for all practical purposes.

Fixed #2391, #2489, #2996, #3322, #3344, #3370, #3406, #3432, #3454, #3492, #3582, #3690, #3878, #3891, #3937, #4039, #4141, #4227, #4286, #4291, #4300, #4452, #4702


git-svn-id: http://code.djangoproject.com/svn/django/trunk@5609 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #4453 -- Allow dots in URL pattern names (although the string in that case is first tried as an import path and only then falls back to being treated as a pattern).


git-svn-id: http://code.djangoproject.com/svn/django/trunk@5530 bcc190cf-cafb-0310-a4f2-bffc1f526a37

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4901 bcc190cf-cafb-0310-a4f2-bffc1f526a37

All work done by Ivan Sagalaev.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@4494 bcc190cf-cafb-0310-a4f2-bffc1f526a37