[Webcom] captcha error

[Lorenzo Becchi]

often, mostly when external url are present in the content, the editing 
of the wiki page requires the captcha even if already confirmed.

on top of the page is visible a PHP warning:

<b>Warning</b>:  preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Unknown modifier 'p' in <b>/var/www/mediawiki-1.11.0/includes/EditPage.php</b> on line <b>645</b><br />


when editing massively it starts to be a problem to add captcha to every 
commit.

I don't have access to that php page so I can't analyze the bug.

ciao
lorenzo