You'd probably be aware that I'm a fan of Stack Overflow. I mean, I have my SO profile over there on the right of the page.
This is just a quick post to provide a link to the best response I've seen on Stack Overflow. And just to clarify, I mean best in terms of amusement. It gets a point across I guess, but wow is it creative.
So here you go: http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454