func getRegionID(s []byte) (Region, error) {
	if len(s) == 3 {
		if isAlpha(s[0]) {
			return getRegionISO3(s)
		}
		if i, err := strconv.ParseUint(string(s), 10, 10); err == nil {
			return getRegionM49(int(i))
		}
	}
	return getRegionISO2(s)
}

// getRegionISO2 returns the regionID for the given 2-letter ISO country code
// or unknownRegion if this does not exist.

	return getScriptID(script, buf[:copy(buf[:], s)])
}

// EncodeM49 returns the Region for the given UN M.49 code.
// It returns an error if r is not a valid code.
func EncodeM49(r int) (Region, error) {
	return getRegionM49(r)
}

// ParseRegion parses a 2- or 3-letter ISO 3166-1 or a UN M.49 code.
// It returns a ValueError if s is a well-formed but unknown region identifier
// or another error if another error occurred.