Last modified: 2011-10-06 12:15:14 UTC
See bug 31379. Regexps built at runtime are not checked for correctness, so a badly designed filter may cause the preg_match to fail. This should be handled properly, to avoid a fatal error (again, see bug 31379). Thanks and best regards, -- Arkanosis@frwiki
This was fixed in r99059/r99060, deployed about 12 hours ago.
Great, that must be why I didn't manage to reproduce the bug a few hours ago. Thanks you!