code: public NegateMultiPos<E, L, R> fnegate(Object filler) {
  		this.filltgt = checkNotNull(filler).toString();
  		negmark(Character.class.isInstance(filler) ? 'M' : NEGATE);
  		return this;
  	}
docs: The negative result will be involved in the operation,
  and the result will filled by given fill target
  <p><b>Only work for {@link com.benayn.ustyle.string.Finder} and {@link com.benayn.ustyle.string.Replacer#ctx(String)} instance,
  not work for {@link com.benayn.ustyle.string.Replacer#of(String)} instance</b>
  
  @param filler
  @return NegateMultiPos<E, L, R> instance