* 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))) {

    doTestTrimLeadingFrom("x-x-", "x-x-");
    doTestTrimLeadingFrom("x-xx", "x-xx");
    doTestTrimLeadingFrom("x-x--xx---x----x", "x-x--xx---x----x");
    // additional testing using the doc example
    assertEquals("catbab", anyOf("ab").trimLeadingFrom("abacatbab"));
  }

  private void doTestTrimLeadingFrom(String in, String out) {
    // Try a few different matchers which all match '-' and not 'x'

    doTestTrimLeadingFrom("x-x-", "x-x-");
    doTestTrimLeadingFrom("x-xx", "x-xx");
    doTestTrimLeadingFrom("x-x--xx---x----x", "x-x--xx---x----x");
    // additional testing using the doc example
    assertEquals("catbab", anyOf("ab").trimLeadingFrom("abacatbab"));
  }

  private void doTestTrimLeadingFrom(String in, String out) {
    // Try a few different matchers which all match '-' and not 'x'

   * 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))) {

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