code: protected IStyleAppendable appendMatch(IStyleAppendable it, String name, String pattern, String... contains) {
  		return appendMatch(it, true, name, pattern, false, contains);
  	}
docs: Append a Vim pattern.
  
  @param it the receiver of the generated elements.
  @param name the name of the pattern.
  @param pattern the regular expression.
  @param contains the elements inside the matched region.
  @return {@code it}.