validateEmail1有效// whyyy ???

validateEmail2返回null

private static final Pattern EMAIL = Pattern.compile(
        "[a-zA-Z0-9\\+\\.\\_\\%\\-\\+]{1,256}" +
                "\\@" +
                "[a-zA-Z0-9][a-zA-Z0-9\\-]{0,64}" +
                "(" +
                "\\." +
                "[a-zA-Z0-9][a-zA-Z0-9\\-]{0,25}" +
                ")+"
);

public boolean validateEmail1(String email) {
    return EMAIL.matcher(email).matches();
}

public boolean validateEmail2(String email) {
    return Patterns.EMAIL_ADDRESS.matcher(email).matches();
}