Some help with RegExp, please

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"; ?> It returns everything. What i really need is to get the contents between <? and ?>, and only that. I can imagine the RegExp is diung it right, because ideed there are <? and, at the end of the text, another ?>, but it is not clever enough to take the PHP UP TO THE FIRST COINDICENCE OF ?>, and so on, and so on... Can anyone help me? I would appreciate it very much. Thanks anyway