If you found a better way, don't be shy -- sharing it is bound to help someone else who's about to ask the same question again.

Ack, sorry graff, you are completely correct. The solution is that it does work as you'd expect. I found a stupid little error that was causing the whole script to fail. Should have spent another 5 minutes debugging before writing this one up. I'm under the gun and then jumped the gun. :( Thanks for the reply.

Let's guess:

foreach my $numbered_param ( grep /^prefix(\d+)/ , param() ) {
    # do something with $numbered_param
}
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If not P, what? Q maybe?
"Sidney Morgenbesser"