sub find_string {
    my ($file, @strings) = @_;
    open my $fh, '<', $file;
    while (<$fh>) {
        for my $string (@strings) {
            return 1 if /\Q$string/;
        }
    }
    die "Unable to find string: @strings";
}

find_string('filename', "testing","link","rd");

##</code><code>##

    open my $fh, '<', $file or die "File open fail ($file): $!";