code: public static boolean isPureAscii(String stringToCheck) {
  		if (stringToCheck == null || stringToCheck.length() == 0) {
  			return true;
  		}
  		synchronized (ASCII_ENCODER) {
  			return ASCII_ENCODER.canEncode(stringToCheck);
  		}
  	}
docs: Checks if a string is pure Ascii
  @param stringToCheck the string
  @return true if is ascci