yes ill be happy to see that.
by the way i got my regular expression knowledge from using these 2 ressources:
http://en.wikipedia.org/wiki/Regular_expression
http://www.regular-expressions.info/
what i find particularily helpful is this reference chart:
http://www.regular-expressions.info/reference.html
shows you pretty much all the symbols so you can see what they do but also know which chars have special meaning so you know to escape them
and of course the php manual page for preg_replace() which is what im using for most of the bbcode tags:
http://php.net/manual/en/function.preg-replace.php