docs: public static int indexOneOf(CharSequence string, char... chars)
    {
      for(int i = 0; i < string.length(); ++i) {
        for(int j = 0; j < chars.length; ++j) {
          if(string.charAt(i) == chars[j]) {
            return i;
          }
        }
      }
      return -1;
    }