use 5.010;
use strict;
use warnings;

use MCE::Flow;

die "Not enough arguments given\n" if @ARGV < 2;

my $regex = shift;
$regex = qr/$regex/;

sub user_func {
   my ($mce, $slurp_ref, $chunk_id) = @_;

   if (my $match = ${ $slurp_ref } =~ $regex ? 1 : 0) {
      $mce->gather($match);
      $mce->abort;
   }
}

for my $filename (@ARGV) {
  my @match = mce_flow_f { use_slurpio => 1 }, \&user_func, $filename;
  say "File '$filename' does".( scalar @match ? "" : "n't" )." match";
}