regex

Hey all, I'm been programming in php for a while, but I'm stumpt with this one. You know the funny thing? It's probably really simple. Anyway here it is. Assume I have this query string: ticket_id=3&change_name=status&change_value=3&ticket_id=3&2=&1=& And all I want is 2=&1=&. Well, the closest I came was : $string = preg_replace("/[^0-9]+\=/", "", $QUERY_STRING); Assuming QUERY_STRING was the data. Please help Thanks Much, Paul