code: public static boolean isValidPart (@Nullable final String sPart)
    {
      return StringHelper.hasText (sPart) && RegExHelper.stringMatchesPattern (REGEX_PART, sPart);
    }
docs: Check if the provided part matches the regular expression
  {@value #REGEX_PART}.
  
  @param sPart
  The part to be checked. May be <code>null</code>.
  @return <code>true</code> if the value matches the regular expression,
  <code>false</code> otherwise.