@Test
	public void testGetNv0() {
		List<String[]> nvList = MultiGroupValueAnalyse.getGroupValueByExp(doc, 
				"id:s_tab->tag:a->[attr:href, text]");
		
		TestCase.assertTrue(null != nvList && nvList.size() > 0);
		
		System.out.println("tab");
		for (String[] nvs : nvList) {
			for (String nv : nvs) {
				System.out.print(nv + "\t");
			}
			System.out.println();
		}
	}