    @Test
    public void getArtist() {

        assertEquals("中文", LrcUtil.getArtist("[ar:中文]"));
        assertEquals("1125", LrcUtil.getArtist("[ar:1125]"));
        assertEquals("[1125]", LrcUtil.getArtist("[ar:[1125]]"));
        assertEquals(null, LrcUtil.getArtist("[ar1235]"));
    }