my @ports = map { qr/$_/ } ("\b12345\b", "\b12346\b", "\b20034\b",
                            "\b8787\b", "\b31337\b", "\b31338\b",
                            "\b54320\b", "\b54321\b");
while (<FWLOG>) {
    for my $port (@ports) {
        if ($_ =~ $port) {
            print;
            last;
        }
    }
}