public static boolean isEmail(String email) {
        return isMatch(EMAIL_REGEX, email);
    }
@Test
    public void testEmail() {
        Assert.assertEquals(false, PatternKit.isEmail("abcd"));
        Assert.assertEquals(true, PatternKit.isEmail("hellokaton@gmail.com"));
        Assert.assertEquals(true, PatternKit.isEmail("1234@q.com"));
    }