* start}, calling {@link #matches} for each character.
   *
   * @param sequence the character sequence to examine
   * @param start the first index to examine; must be nonnegative and no greater than {@code
   *     sequence.length()}
   * @return the index of the first matching character, guaranteed to be no less than {@code start},
   *     or {@code -1} if no character matches

   */
  @CanIgnoreReturnValue
  public static int advance(Iterator<?> iterator, int numberToAdvance) {
    checkNotNull(iterator);
    checkArgument(numberToAdvance >= 0, "numberToAdvance must be nonnegative");

    int i;
    for (i = 0; i < numberToAdvance && iterator.hasNext(); i++) {
      iterator.next();
    }
    return i;
  }

  /**