code: public static String fromHex(String string, int minLength, String separator) {
          return fromHex(string, minLength, Pattern.compile(separator != null ? separator : "\\s+"));
      }
docs: Parse a list of hex numbers and return a string
  @param string String of hex numbers.
  @param minLength Minimal length.
  @param separator Separator.
  @return A string from hex numbers.