Replace backslash in reverse URL matcher

[Bastian Kleineidam <calvin@…>]

The reverse URL pattern matcher should replace backslashes
stemming from regex escapes in the result URL.
Added also a test case.

[Chris Beaven]

There are a lot more things to do to fix up the reverse URL matcher than this, but it is a simple change. I'll push to a design decision.

Should probably have a test case.

[Bastian Kleineidam <calvin@…>]

There is a test case in the patch, it's just very small :)

What is it that needs fixing up in the reverse matcher?
Perhaps it is the fact that the reverse matcher cannot be a (perfect) function, since there might be two or more URLs that resolve to the same view. For example this pattern:

('docs/index[12].doc', 'docs.display')

resolves two different URLs to the exact same view. Same with multiple patterns pointing to the same view:

('docs/index1.doc', 'docs.display')
('docs/index2.doc', 'docs.display')

A reverse function for docs.display does not exist then. Perhaps {{reverse()}}} should throw ValueError in these cases to make the user aware of this issue, but that is a more invasive change.

[Chris Beaven]

Sorry Bastian, i 10 second scanned the patch and overlooked the test :)

The reverse matcher can be much more sane, even if there are multiple cases. My patch the ancient (still open) #2977 ticket covers most cases. But, like I said - yours is a simple fix and a reasonably common case.

[Chris Beaven]

Fixed (3 years ago in r8760)