Roman validate

private static boolean validatingRoman(String s){

String format = "^M{0,4}(CM|CD|D?C{0,3})(IC|IL|L?I{0,3})(IX|IV|V?I{0,3})$";

Pattern pattern = Pattern.compile(format);

Matcher m = pattern.matcher(s);

if(m.find()){

return true;

}

return false;

}