RexExp [OR]

Thanks in advance for your time. I have an expression that can contain 0-9 or the word MAX, and nothing else. I was looking for an efficient way to put this into one ereg_replace statement. Something close to ereg_replace("[^(MAX)0-9]", $string) ... Thus looking for anything NOT the phrase MAX or 0-9 and stripping it. I am aware of how to do it in multiple lines using if/then comparisons with ereg matches. However, I would like to increase my programming prowess (and lessen the time I spend typing) by coming up with a powerful syntax to do it in one fell swoop. Thanks again: Michael Richardson