@Test public void testIsValid() throws Exception { String valid = "*****@*****.**"; String invalid = "nic@cz"; String regex = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$"; assertTrue(StringValidator.isValid(valid, regex)); assertFalse(StringValidator.isValid(invalid, regex)); }