Regular Expression - highlighting

Hello list, I'm pretty terrible with regular expressions, I was wondering if someone would be able to help me with this http://paste.phpfi.com/31964 The problem is detailed in the above link. Basically I need to match the contents of any HTML tag, except a link. I'm pretty sure a lookbehind set is needed in the center (%s) bit. Any suggestions would be appreciated, but it's not quite as simple as it sounds - if possible please make sure you run the above script and see if it "PASSED". Here's a little gui to make it easier to test: http://aidan.dotgeek.org/test_hl.php Thanks in advance, Aidan