Most people have been showing map { /param=(.*)/ ? $1 : () }, but if you're using list context (like print() supplies), you can just write map { /param=(.*)/ }.
Jeff japhy Pinyan,
P.L., P.M., P.O.D, X.S.:
Perl,
regex,
and perlhacker How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart