Help with ereg()

Hi all. I'm trying to deal with Regular Expressions, but somehow it is getting more difficult. I´m trying to do the folowing: Read a text and get all of the PHP code out of it, highlight it and then print all in nice HTML. I'm using this to get the PHP code: ereg("<\?.*\?>",$Text,$PHP_code); It works, yeah, but on a situation like this: <? echo "aaaa"; ?> This is some other no php code <? echo "this is PHP"; ?> Thanks all. I think this post is somewhere in the list, with another subject.