* the beginning of the string. For example:
   *
   * <pre>{@code
   * CharMatcher.anyOf("ab").trimLeadingFrom("abacatbab")
   * }</pre>
   *
   * ... returns {@code "catbab"}.
   */
  public String trimLeadingFrom(CharSequence sequence) {
    int len = sequence.length();
    for (int first = 0; first < len; first++) {
      if (!matches(sequence.charAt(first))) {