java 验证邮箱格式怎么实现？

如果是java代码验证的话，实例代码如下：

    public static boolean checkEmail(String email){
        boolean flag = false;
        try{
                String check = "^([a-z0-9A-Z]+[-|_|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
                Pattern regex = Pattern.compile(check);
                Matcher matcher = regex.matcher(email);
                flag = matcher.matches();
            }catch(Exception e){
                flag = false;
            }
        return flag;
    }