如何使用JQuery来验证电子邮件地址?
当前回答
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
其他回答
<!-- Dont forget to include the jQuery library here -->
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#validate").keyup(function(){
var email = $("#validate").val();
if(email != 0)
{
if(isValidEmailAddress(email))
{
$("#validEmail").css({
"background-image": "url('validYes.png')"
});
} else {
$("#validEmail").css({
"background-image": "url('validNo.png')"
});
}
} else {
$("#validEmail").css({
"background-image": "none"
});
}
});
});
function isValidEmailAddress(emailAddress) {
var pattern = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);
return pattern.test(emailAddress);
}
</script>
<style>
#validEmail
{
margin-top: 4px;
margin-left: 9px;
position: absolute;
width: 16px;
height: 16px;
}
.text
{
font-family: Arial, Tahoma, Helvetica;
}
</style>
<title>Live Email Validation with jQuery Demo</title>
</head>
<body>
<div class="text"><h1>Reynoldsftw.com - Live Email Validation</h1><h2>Type in an email address in the box below:</h2></div>
<div><input type="text" id="validate" width="30"><span id="validEmail"></span></div>
<div class="text"><P>More script and css style
: www.htmldrive.net
来源:htmldrive.com
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})+$/;
return regex.test(email);
}
你应该看到:jquery.validate.js，把它添加到你的项目
这样使用它:
<input id='email' name='email' class='required email'/>
function validateEmail(emailaddress){
var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;
if(!emailReg.test(emailaddress)) {
alert("Please enter valid email id");
}
}
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