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<?php preg_match('/^\/validation\/(?P<user_name>.*)?\/(?P<user_key>.*)?\/$/', "/validation/a%a/1/",$matches); print_r($matches); echo "\n";
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => /validation/a%a/1/ [user_name] => a%a [1] => a%a [user_key] => 1 [2] => 1 )

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