$re[0] = qr (.*(?!system))i;
$re[1] = qr (system)i;
$v[0] = "oneitem";
$v[1] = "anothersystem";

for $a (@v) {
  for $r (@re) {
    print "\nRegex: $r\tValue: $a\n";
    if ($a =~ /$r/) {
      print "$a matches $r\n" ;
    }
  }
}