regex haha

protected override void SubtypeWrite(DSBinaryWriter bin)
{
    bin.Write(UNK1);
    bin.Write(UNK2);
    bin.Write(UNK3);
    bin.Write(UNK4);

    Match match = Regex.Match(MapName, @"^m(\d\d|xx)_(\d\d|xx)_(\d\d|xx)_(\d\d|xx)$");
    if (!match.Success)
        InvalidNameException();

    string ms1 = match.Groups[1].Value.ToUpper();
    string ms2 = match.Groups[2].Value.ToUpper();
    string ms3 = match.Groups[3].Value.ToUpper();
    string ms4 = match.Groups[4].Value.ToUpper();

    sbyte m1 = ms1 == "XX" ? -1 : sbyte.Parse(ms1);
    sbyte m2 = ms2 == "XX" ? -1 : sbyte.Parse(ms2);
    sbyte m3 = ms3 == "XX" ? -1 : sbyte.Parse(ms3);
    sbyte m4 = ms4 == "XX" ? -1 : sbyte.Parse(ms4);

    bin.Write(m1);
    bin.Write(m2);
    bin.Write(m3);
    bin.Write(m4);

    bin.Write(UNK7);
    bin.Write(UNK8);
}