code: private static final int findKeyword(String s, String[] list) {
          s = PatternProps.trimWhiteSpace(s).toLowerCase(rootLocale);
          for (int i = 0; i < list.length; ++i) {
              if (s.equals(list[i]))
                  return i;
          }
          return -1;
      }
docs: Locale.ROOT only @since 1.6