邮箱正则验证

private boolean checkEmail(String email) {
        boolean flag = false;
        try{
            String = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
            Pattern regex = Pattern.compile(check);
            Matcher matcher = regex.matcher(email);
            flag = matcher.matches();
        }catch(Exception e){
            flag = false;
        }
        return flag;
    }