@Test
  public void testMatcher2() throws SequenceException {
    String patternStr = "B-NP_n I-NP_n*";
    LayeredTokenPattern pat = new LayeredTokenPattern(patternStr);
    LayeredTokenMatcher m = pat.matcher(seq);
    assertTrue(m.find());
    assertEquals(2, m.start());
    assertEquals(4, m.end());
    assertTrue(m.find());
    assertEquals(5, m.start());