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javascript regex validation email
3 Answer(s) a year and a month ago
Posted in : JavaScript Questions

How to write JavaScript regex validation for email?

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May 11, 2012 at 10:51 AM

<html>
<head>
<title>Email validation using regex</title>
<script type="text/javascript">
    function validate() {
        var email = document.getElementById("email").value;
        var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
        if (emailPattern.test(email)) {
            alert("Email Id: " + email);
            return true;
        } else {
            alert("Email Id is not valid!");
            return false;
        }
    }
</script>

</head>
<body>
<h2>Validating Email Id..</h2>
Email Id :
<input type="text" name="email" id="email" />
<input type="submit" value="Submit" onclick="validate();"/>
</body>
</html>

May 12, 2012 at 1:18 PM

Email pattern is like HYPERLINK "mailto:abc@ab.aaa" abc@ab.aaa. you have to check the pattern of combination of these two. Sometimes space is also included in it.

In pattern /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,4}$/
/../(forward slashes) is used to quote your regular expression.
^ shows beginning of string.
[..] matches any letter enclosed with in.
+ shows that preceding character come 1 or more times.
. Shows that \ will treat . as a literal.
{2,4} shows the range that content having length between 2 to 4.
$ is used for ending the string.
test() method takes one argument and check that to the pattern.

May 18, 2012 at 5:40 AM

Don't forget that some TLDs are longer than 4 characters, for example .museum. I've used a 7 character length for TLD and you can see it in action at

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