docs: private boolean checkStringToBeParsed(final String pStringToBeParsed) {
  
      // Check for nullness
      if (pStringToBeParsed == null) {
        if (mDebugging) {
          out.println(DebugUtil.getPrefixDebugMessage(this) + "string to be parsed is null - rejection!");
        }
        return false;
      }
  
      // Check if valid character (element in alphabet)
      for (int i = 0; i < pStringToBeParsed.length(); i++) {
        if (!isInAlphabet(pStringToBeParsed.charAt(i))) {
          if (mDebugging) {
            out.println(DebugUtil.getPrefixDebugMessage(this)
                        + "one or more characters in string to be parsed are not legal characters - rejection!");
          }
          return false;
        }
      }
      return true;
    }