用于确定电子邮件域的 JavaScript RegEx（例如 yahoo.com）
[英]JavaScript RegEx to determine the email's domain (yahoo.com for example)
问题描述
With JavaScript I want to take a input 1st validate that the email is valid (I solved for this) 2nd, validate that the email address came from yahoo.com
使用 JavaScript 我想输入第一个验证电子邮件是否有效（我解决了这个问题）第二个，验证电子邮件地址来自 yahoo.com
Anyone know of a Regex that will deliver the domain?任何人都知道将提供域的正则表达式？
thxs谢谢
11 个解决方案
解决方案1
8 已采纳 2010-07-17 04:13:47
var myemail = 'test@yahoo.com'
if (/@yahoo.com\s*$/.test(myemail)) {
console.log("it ends in @yahoo");
}
is true if the string ends in @yahoo.com (plus optional whitespace). 如果字符串以@yahoo.com结尾（加上可选的空格），则为true。
解决方案2
5 2010-07-17 04:12:12
You do not need to use regex for this. 您不需要使用正则表达式。
You can see if a string contains another string using the indexOf method. 您可以使用indexOf方法查看字符串是否包含另一个字符串。
var idx = emailAddress.indexOf('@yahoo.com');
if (idx > -1) {
// true if the address contains yahoo.com
}
We can take advantage of slice() to implement "ends with" like so: 我们可以利用slice()来实现“结束”，如下所示：
var idx = emailAddress.lastIndexOf('@');
if (idx > -1 && emailAddress.slice(idx + 1) === 'yahoo.com') {
// true if the address ends with yahoo.com
}
In evergreen browsers, you can use the built in String.prototype.endsWith() like so: 在常绿浏览器中，您可以使用内置的String.prototype.endsWith（），如下所示：
if (emailAddress.endsWith('@yahoo.com')) {
// true if the address ends with yahoo.com
}
解决方案3
2 2014-07-23 07:02:01
function emailDomainCheck(email, domain)
{
var parts = email.split('@');
if (parts.length === 2) {
if (parts[1] === domain) {
return true;
}
}
return false;
}
:) :)
解决方案4
1 2010-07-17 04:21:02
To check for a particular domain (yahoo.com): 要检查特定域（yahoo.com）：
/^[^@\s]+@yahoo.com$/i.test(email)
// returns true if it matches
To extract the domain part and check it later: 要提取域部分并在以后检查它：
x = email.match(/^[^@\s]+@([^@\s])+$/)
// x[0] contains the domain name
解决方案5
1 2018-04-02 05:13:05
Try this: 尝试这个：
/^\w+([\.-]?\w+)*@\yahoo.com/.test("you@yahoo.com"); //Returns True
/^\w+([\.-]?\w+)*@\yahoo.com/.test("you@abc@yahoo.com"); //Returns false
/^\w+([\.-]?\w+)*@\yahoo.com/.test("you#abc@yahoo.com"); //Returns false
/^\w+([\.-]?\w+)*@\yahoo.com/.test("you/abc@yahoo.com"); //Returns false
Above are some test cases. 以上是一些测试用例。
解决方案6
0 2015-04-23 23:18:04
对于Yahoo域名（无用户名）
@(((qc|ca)?\.yahoo\.com)|yahoo\.(com(\.(ar|au|br|co|hr|hk|my|mx|ph|sg|tw|tr|vn))?|ae|at|ch|es|fr|be|co\.(in|id|il|jp|nz|za|th|uk)|cz|dk|fi|de|gr|hu|in|ie|it|nl|no|pl|pt|ro|ru|se))
解决方案7
0 2010-07-17 04:01:53
What about this? 那这个呢？
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
<script type="text/javascript">
var okd = ['yahoo.com'] // Valid domains...
var emailRE = /^[a-zA-Z0-9._+-]+@([a-zA-Z0-9.-]+\.[a-zA-Z]{2,4})$/
function ckEmail(tst)
{
var aLst = emailRE.exec(tst)
if (!aLst) return 'A valid e-mail address is requred';
var sLst = aLst[1].toLowerCase()
for (var i = 0; i < okd.length; i++) {
if (sLst == okd[i]) {
return true
}
}
return aLst[1];
}
var ckValid = ckEmail(prompt('Enter your email address:'))
if (ckValid === true) {
alert(ckValid) // placeholder for process validated
} else {
alert(ckValid) // placeholder for show error message
}
</script>
<title></title>
</head>
<body>
</body>
</html>
解决方案8
0 2010-07-17 04:16:54
var rx = /^([\w\.]+)@([\w\.]+)$/;
var match = rx.exec("user@yahoo.com");
if(match[1] == "yahoo.com"){
do something
}
second capturing group will contain the domain. 第二个捕获组将包含域。
解决方案9
0 2010-07-17 04:30:04
>>> String('test@yahoo.com').replace(/^[^@]*@/, '')
'yahoo.com'
解决方案10
0 2019-01-17 09:05:14
Domain name is mandatory like .com , .in , .uk It'll check update 2 letter after '.' 域名是强制性的，如.com，.in，.uk它会在'。'之后检查更新2个字母。 and '@' is also mandatory. '@'也是强制性的。
<!DOCTYPE html>
<html>
<body>
<script>
function validateEmail(email) {
debugger;
console.log(email);
var re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
//return ture for .com , .in , .co upto 2 letter after .
console.log(re.test(String(email).toLowerCase()));
return re.test(String(email).toLowerCase());
}
</script>
<h2>Text field</h2>
<p>The <strong>input type="text"</strong> defines a one-line text input field:</p>
<form action="#" onSubmit="validateEmail(firstname.value)">
First name:<br>
<input type="email" name="firstname">
<br>
Last name:<br>
<input type="text" name="lastname">
<br><br>
<input type="submit">
</form>
<p>Note that the form itself is not visible.</p>
<p>Also note that the default width of a text field is 20 characters.</p>
</body>
</html>
解决方案11
0 2021-11-14 12:20:46
After reading previous answers and checking https://caniuse.com/mdn-javascript_builtins_string_endswith , the simplest way to check domain of an email is String.prototype.endsWith() method.在阅读之前的答案并检查https://caniuse.com/mdn-javascript_builtins_string_endswith 后，检查电子邮件域的最简单方法是String.prototype.endsWith()方法。
A simple program to check different inputs can be like below:检查不同输入的简单程序如下所示：
function validateEmail(email: string): boolean {
return email.endsWith("example.com");
}
const emailCheckResults = new Map<string, boolean>();
const emailsToCheck = ["test@example.com", "example.com@somethingelse.com", "attacker@somedomain.com"];
emailsToCheck.map((email) => {
emailCheckResults.set(email, validateEmail(email));
});
Array.from(emailCheckResults.keys()).map((key) => {
console.log(`Checked: ${key}, Result: ${emailCheckResults.get(key)}`);
});
This will result following:这将导致以下结果：
Checked: test@example.com, Result: true
Checked: example.com@somethingelse.com, Result: false
Checked: attacker@somedomain.com, Result: false
Approaches like using indexOf or split simply didn't seem to me clean.像使用indexOf或split这样的方法在我看来并不干净。
I recommend using String.prototype.endsWith() method to avoid simple mistakes in regex, to improve readability and testability of the code, to reduce attack surface if this is used in an authentication system etc.我建议使用String.prototype.endsWith()方法来避免正则表达式中的简单错误，提高代码的可读性和可测试性，如果在身份验证系统中使用，则减少攻击面等。
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