http://qs321.pair.com?node_id=591906


in reply to expression which does nothing

Which has already been mentioned, this appears to be a Noop. Maybe try running with warnings.
Cheers,
s;;5776?12321=10609$d=9409:12100$xx;;s;(\d*);push @_,$1;eg;map{print chr(sqrt($_))."\n"} @_;