I got an error since I updated my wiki to the newest version :
sometimes (when I edit code), I got this error message on my wiki :
Warning: preg_match() [function.preg-match]: Compilation failed: unrecognized character after (?< at offset 3 in /home/www/projets/wiki-dsi/php/master/inc/geshi.php on line 2132
I have to refresh my page in order to make it disappear.
Screenshot joined