docs: public PeriodFormatterBuilder appendSuffix(String[] regularExpressions, String[] suffixes) {
          if (regularExpressions == null || suffixes == null ||
                  regularExpressions.length < 1 || regularExpressions.length != suffixes.length) {
              throw new IllegalArgumentException();
          }
          return appendSuffix(new RegExAffix(regularExpressions, suffixes));
      }