降落在这里……结果是这样的: https://html.spec.whatwg.org/multipage/forms.html#valid-e-mail-address

.．.它提供了以下正则表达式:

/^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/

.．.这要感谢jQuery验证插件自述文件上的注释: https://github.com/jzaefferer/jquery-validation/blob/master/README.md#reporting-an-issue

所以，@Fabian的答案的更新版本是:

function IsEmail(email) {
  var regex = /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;
  return regex.test(email);
}

希望这能有所帮助

正如其他人提到的，您可以使用正则表达式来检查电子邮件地址是否匹配模式。但你仍然可以有符合模式的电子邮件，但我仍然反弹或虚假的垃圾邮件。

用正则表达式检查

var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
return regex.test(email);

使用真正的邮件验证API进行检查

您可以使用API来检查电子邮件地址是否真实且当前处于活动状态。

var emailAddress = "foo@bar.com"
response = $.get("https://isitarealemail.com/api/email/validate?email=" +
    emailAddress,
    function responseHandler(data) {
        if (data.status === 'valid') {
            // the email is valid and the mail box is active
        } else {
            // the email is incorrect or unable to be tested.
        }
    })

欲了解更多信息，请参阅https://isitarealemail.com或博客文章

对于那些希望使用比破坏性的长达光年的RegEx匹配更好的可维护解决方案的人，我写了几行代码。那些想要节省字节的人，坚持使用RegEx变体:)

这种限制:

字符串中没有@ 字符串中没有点 @后面超过2个点 用户名中的错误字符(@之前) 字符串中超过2个@ 域内字符错误 子域字符错误 TLD中的坏字符 TLD -地址

无论如何，仍然有可能泄露，所以一定要将此与服务器端验证+电子邮件链接验证结合起来。

这是JSFiddle

 //validate email

var emailInput = $("#email").val(),
    emailParts = emailInput.split('@'),
    text = 'Enter a valid e-mail address!';

//at least one @, catches error
if (emailParts[1] == null || emailParts[1] == "" || emailParts[1] == undefined) { 

    yourErrorFunc(text);

} else {

    //split domain, subdomain and tld if existent
    var emailDomainParts = emailParts[1].split('.');

    //at least one . (dot), catches error
    if (emailDomainParts[1] == null || emailDomainParts[1] == "" || emailDomainParts[1] == undefined) { 

        yourErrorFunc(text); 

     } else {

        //more than 2 . (dots) in emailParts[1]
        if (!emailDomainParts[3] == null || !emailDomainParts[3] == "" || !emailDomainParts[3] == undefined) { 

            yourErrorFunc(text); 

        } else {

            //email user
            if (/[^a-z0-9!#$%&'*+-/=?^_`{|}~]/i.test(emailParts[0])) {

               yourErrorFunc(text);

            } else {

                //double @
                if (!emailParts[2] == null || !emailParts[2] == "" || !emailParts[2] == undefined) { 

                        yourErrorFunc(text); 

                } else {

                     //domain
                     if (/[^a-z0-9-]/i.test(emailDomainParts[0])) {

                         yourErrorFunc(text); 

                     } else {

                         //check for subdomain
                         if (emailDomainParts[2] == null || emailDomainParts[2] == "" || emailDomainParts[2] == undefined) { 

                             //TLD
                             if (/[^a-z]/i.test(emailDomainParts[1])) {

                                 yourErrorFunc(text);

                              } else {

                                 yourPassedFunc(); 

                              }

                        } else {

                             //subdomain
                             if (/[^a-z0-9-]/i.test(emailDomainParts[1])) {

                                 yourErrorFunc(text); 

                             } else {

                                  //TLD
                                  if (/[^a-z]/i.test(emailDomainParts[2])) {

                                      yourErrorFunc(text); 

                                  } else {

                                      yourPassedFunc();
}}}}}}}}}

你应该看到:jquery.validate.js，把它添加到你的项目

这样使用它:

<input id='email' name='email' class='required email'/>

你可以创建自己的函数

function emailValidate(email){
    var check = "" + email;
    if((check.search('@')>=0)&&(check.search(/\./)>=0))
        if(check.search('@')<check.split('@')[1].search(/\./)+check.search('@')) return true;
        else return false;
    else return false;
}

alert(emailValidate('your.email@yahoo.com'));

http://so.devilmaycode.it/jquery-validate-e-mail-address-regex/ 使用新的正则表达式 增加了对地址标签(+号)的支持

function isValidEmailAddress(emailAddress) { var pattern = /^([a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+(\.[a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+)*|"((([ \t]*\r\n)?[ \t]+)?([\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|\\[\x01-\x09\x0b\x0c\x0d-\x7f\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))*(([ \t]*\r\n)?[ \t]+)?")@(([a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.)+([a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.?$/i; return pattern.test(emailAddress); };

if( !isValidEmailAddress( emailaddress ) ) { /* do stuff here (email is invalid) */ }

这是由用户Luca Filosofi提供的答案