public static bool Contains(this string soure, string match) {
	bool retVal = false;
	for (int sIndex = 0, mIndex = 0; (sIndex < source.Length || mIndex < match.Length) && source.Length >= match.Length - mIndex; sIndex++) {
		if (source[sIndex] == match[mIndex++] {
			retVal = true;
		} else {
			retVal = false;
			mIndex = 0;
		}
	}
	return retVal;
}