It's possible (IIRC), but you'd be much better off boning up on CGI and using PATHINFO or GET. See CGI and CGI::Lite.

UPDATE: Additionally, passing arguments directly could be a Bad Thing. Passing parameters via another means requires additional processing to extract them, this is a Good Thing because while you are doing this you might as well go "whole hog"(?) and untaint and validate the data. Just as a general rule.

--
perl -pe "s/\b;([st])/'\1/mg"