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

你可以使用常规的旧javascript:

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

$.validator.addMethod("mymail", function(value, element) {
        return this.optional( element ) || /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/.test( value );
}, "Enter valid email!");

这可能会有帮助!对user4974898的答案做了一个小修改!

另一个简单而完整的选择:

<input type="text" id="Email"/>
<div id="ClasSpan"></div>   
<input id="ValidMail" type="submit"  value="Valid"/>  


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

$("#ValidMail").click(function () {
    $('span', '#ClasSpan').empty().remove();
    if (IsEmail($("#Email").val())) {
        //aqui mi sentencia        
    }
    else {
        $('#ClasSpan').append('<span>Please enter a valid email</span>');
        $('#Email').keypress(function () {
            $('span', '#itemspan').empty().remove();
        });
    }
});

我从jqvalidate版本1.11.0中获得这段代码，并在版本1.16.0中作为另一个方法实现。它的工作原理

            jQuery.validator.addMethod("strictemail", function(value, element) {
                    var valid = /^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\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]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([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.test(value);
                    return valid;
                }, "Escribe un correo v\u00e1lido"
            );

在电子邮件规则中

            'correo': {
                required: 'Por favor ingresa tu correo',
                email: 'Escribe un correo v\u00e1lido',
                strictemail:'Escribe un correo v\u00e1lido'
            }

使用jquery.validate.js，它有微软ajax CDN。

$('#form').validate({
    rules:{
        "name":{
            required:true,
            maxlength:40
        },

        "email":{
            required:true,
            email:true, //for validate email
            maxlength:100
        },

        "message":{
            required:true
        }
    }
});