#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

for my $string ( '?!?!?!/pack/something/whatever.cacshdska',
                 '!2!ab!!!!/pack/something/whatever.cacshdska',
               ) {
    my ($before, $after) = $string =~ m{(.*)..\W/.*\.c(.*)};
    say "$before | $after";
}