public static bool IsRegion(string s)
{
// region = 2ALPHA ; ISO 3166-1 code
// / 3DIGIT ; UN M.49 code
return(((s.Length == 2) && AsciiUtil.IsAlpha(s)) ||
((s.Length == 3) && AsciiUtil.IsNumeric(s)));
}
public static bool IsVariant(string s)
{
// variant = 5*8alphanum ; registered variants
// / (DIGIT 3alphanum)
int len = s.Length;
if (len >= 5 && len <= 8)
{
return(AsciiUtil.IsAlphaNumericString(s));
}
if (len == 4)
{
return(AsciiUtil.IsNumeric(s[0]) &&
AsciiUtil.IsAlphaNumeric(s[1]) &&
AsciiUtil.IsAlphaNumeric(s[2]) &&
AsciiUtil.IsAlphaNumeric(s[3]));
}
return(false);
}