note kennethk For me, the code <c>print "yes\n" if $cdp =~ /0x01/;</c> prints <c>yes</c> which means that your regular expression is valid. Can you show us a little more surrounding code? What do you expect to find in your array when you are done? Mine contains a <c>1</c>, because that's what <c>m//</c> returns on a successful match. <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-712372"> <hr /> <p>#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.</p> </div></div> 1007760 1007760