code: public static boolean isBlank(String target, String... specialValueAsEmpty) {
  		if (Strings.isNullOrEmpty(target)) {
  			return true;
  		}
  		
  		return isEmpty(WHITESPACE.removeFrom(target), specialValueAsEmpty);
  	}
docs: Checks if a String is whitespace, multi whitespace, empty ("") or null or special value.
  
  @param target
  @param specialValueAsEmpty
  @return