code: @DontLabel
      public Rule anyOf(final String characters)
      {
          Objects.requireNonNull(characters);
          // TODO: see in this Characters class whether it is possible to wrap
          return anyOf(characters.toCharArray());
      }
docs: Match any of the characters in the given string
  
  <p>This method delegates to {@link #anyOf(Characters)}.</p>
  
  @param characters the characters
  @return a rule
  
  @see #anyOf(Characters)