html parsing question

Hello, I've got a little question. I am writing a page where I would like to parse my own invented HTML-looking tags (but want to keep the real HTML tags intact). I use a buffer for the output, and just before the end use ob_get_contents() to get the whole buffer which I want to check for those tags. (Something like: $tag->content = ob_get_contents(); $output = $tag->interpret(); ob_end_clean(); echo "$output"; ) Now my question is, what is the fastest way to search and replace through this file, whereby the interpretation of the tag can be somewhat complicated? I first just had a loop running character by character through this text, looking for tags, but that is obviously way too slow. Now I have something like: preg_replace_callback ("/<(.+)>/", array($this, 'tag_callback'), $this->content); But then I don't know how to interpret different tags differently. Any suggestions? (A tag looks like: <CANTR REPLACE NAME=text> where then the whole tag has to be replaced by something called 'text' that has to be looked up in a table. So, <CANTR REPLACE NAME=text> has to be replaced with something else than <CANTR REPLACE NAME=main> - well, you get the idea.) Thanks in advance for any help! Jos -- Jos Elkink Game Administration Council Cantr II http://www.cantr.net