doTestTrimFrom("x-x-", "x-x");
    doTestTrimFrom("x-xx", "x-xx");
    doTestTrimFrom("x-x--xx---x----x", "x-x--xx---x----x");
    // additional testing using the doc example
    assertEquals("cat", anyOf("ab").trimFrom("abacatbab"));
  }

  private void doTestTrimFrom(String in, String out) {
    // Try a few different matchers which all match '-' and not 'x'
    assertEquals(out, is('-').trimFrom(in));

    doTestTrimFrom("x-x-", "x-x");
    doTestTrimFrom("x-xx", "x-xx");
    doTestTrimFrom("x-x--xx---x----x", "x-x--xx---x----x");
    // additional testing using the doc example
    assertEquals("cat", anyOf("ab").trimFrom("abacatbab"));
  }

  private void doTestTrimFrom(String in, String out) {
    // Try a few different matchers which all match '-' and not 'x'
    assertEquals(out, is('-').trimFrom(in));

   * the beginning and from the end of the string. For example:
   *
   * <pre>{@code
   * CharMatcher.anyOf("ab").trimFrom("abacatbab")
   * }</pre>
   *
   * ... returns {@code "cat"}.
   *
   * <p>Note that:
   *
   * <pre>{@code
   * CharMatcher.inRange('\0', ' ').trimFrom(str)
   * }</pre>
   *