assertEquals("catbab", anyOf("ab").trimLeadingFrom("abacatbab"));
  }

  private void doTestTrimLeadingFrom(String in, String out) {
    // Try a few different matchers which all match '-' and not 'x'
    assertEquals(out, is('-').trimLeadingFrom(in));
    assertEquals(out, is('-').or(is('#')).trimLeadingFrom(in));
    assertEquals(out, isNot('x').trimLeadingFrom(in));

    assertEquals("catbab", anyOf("ab").trimLeadingFrom("abacatbab"));
  }

  private void doTestTrimLeadingFrom(String in, String out) {
    // Try a few different matchers which all match '-' and not 'x'
    assertEquals(out, is('-').trimLeadingFrom(in));
    assertEquals(out, is('-').or(is('#')).trimLeadingFrom(in));
    assertEquals(out, isNot('x').trimLeadingFrom(in));

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