assertThat(letters).containsExactly("", "a", "b", "c").inOrder();
  }

  @GwtIncompatible // java.util.regex.Pattern
  public void testPatternSplitWithLongTrailingDelimiter() {
    String longDelimiter = "a, b, c/ ";
    Iterable<String> letters = Splitter.on(Pattern.compile("[,/]\\s")).split(longDelimiter);
    assertThat(letters).containsExactly("a", "b", "c", "").inOrder();