public static int indexOf(CharSequence str, char searchChar) {
		return indexOf(str, searchChar, 0);
	}
@Test
	public void indexOfTest() {
		int index = CharSequenceUtil.indexOf("abc123", '1');
		assertEquals(3, index);
		index = CharSequenceUtil.indexOf("abc123", '3');
		assertEquals(5, index);
		index = CharSequenceUtil.indexOf("abc123", 'a');
		assertEquals(0, index);
	}