protected override bool Validate(string key, string value)
{
Guard.ArgumentNotNull(key, "key");
Guard.ArgumentNotNull(value, "value");
if (key.Length != 1 && !Char.IsLetterOrDigit(key[0]))
{
throw new FormatException("Singleton must be a single letter or digit");
}
if (!String.IsNullOrEmpty(value))
{
bool result;
switch (key[0])
{
case 'u':
case 'U':
result = BcpLanguageTag.IsValid("root-u-" + value);
break;
case 't':
case 'T':
result = BcpLanguageTag.IsValid("root-t-" + value);
break;
case 'x':
case 'X':
result = Regex.IsMatch(value, reXValue, RegexOptions.IgnoreCase);
break;
default:
result = Regex.IsMatch(value, reSValue, RegexOptions.IgnoreCase);
break;
}
if (!result)
{
throw new FormatException(String.Format("'{0}' is not a valid sequence for {1} singleton", value, key));
}
}
return(true);
}
public static bool IsStructurallyValidLanguageTag(string locale)
{
return(BcpLanguageTag.IsValid(locale));
}
