Android 验证邮箱的正则表达式

if (!(isEmail(mail))){
         Utils.showToast(mContext,"请填写正确的邮箱格式地址");
         return;
    }


    //判断email格式是否正确
    public boolean isEmail(String email) {
        String str = "^([a-zA-Z0-9_\\-\\.]+)@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$";
        Pattern p = Pattern.compile(str);
        Matcher m = p.matcher(email);

        return m.matches();
    }