docs: @GwtIncompatible("java.util.regex.Pattern")
    public void doesNotContainMatch(Pattern regex) {
      Matcher matcher = regex.matcher(actual());
      if (matcher.find()) {
        failWithoutActual(
            fact("expected not to contain a match for", regex),
            fact("but contained", matcher.group()),
            fact("full string", actualCustomStringRepresentationForPackageMembersToCall()));
      }
    }