symfony/symfony — pull request #3884 by Tobion (2012-04-11 16:32:57+00:00)
Title: [Routing] simplified regex with named variables

Test pass: yes
BC break: no

Since PHP 5.2.2 subpatterns in regex can be simplified from `?P` to `?` (see http://www.php.net/manual/en/regexp.reference.subpatterns.php).
This enhances readability.