code: public static int findLastNotOf(String container, String charSeq, int end){
          for (int i = end; i < container.length() && i >= 0; --i){
              if (!charSeq.contains("" + container.charAt(i)))
                  return i;        
          }
          return -1;
      }
docs: Find last not of.
  
  @param container the container
  @param charSeq the char seq
  @param end the end
  @return the int