[Plugin: jQuery Colorbox] Wrong regexp in addColorboxGroupIdToImages() parser function

There is a regexp /class/i to check if img element already have a class attribute (jquery-colorbox.php:236). But this regexp will work wrong if, for example, image path contains string ‘class’ in it’s path. So it’s better to change this regexp with something like /(?<=\s)class(?=\=)/i.

http://wordpress.org/extend/plugins/jquery-colorbox/