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OctJavaScript Email Address validation using Regular Expression
22 Sep 2025
Intermediate
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2 min read
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We can validate email address at client side and server side. To validate email address on client side, we can use java script with regular expression. Java script can check the regular expression pattern for valid email address. We have different regular expression patterns for validating email address.
In this article, I am sharing some useful cross browsers regular expression patterns for validating email address with java script and jquery. To dive deeper into JavaScript and enhance your skills, be sure to enroll in our Free Javascript Course for a complete learning experience.
Simple regular expression to validate email address
Below is simple regular expression to validate an email address. It will accept email address in upper case also.
<script type="text/javascript">
function validateEmail(email)
{
var reg = /^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/
if (reg.test(email)){
return true; }
else{
return false;
}
}
</script> Read More: Javascript Developer Salary in India
Regular expression to validate case-sensitive email address
Below is regular expression to validate an email address with lower case chars.
<script type="text/javascript">
function validateCaseSensitiveEmail(email)
{
var reg = /^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$/;
if (reg.test(email)){
return true;
}
else{
return false;
}
}
</script> Regular expression to validate free/domain specific email address
Below is regular expression to validate domain specific email address.
<script type="text/javascript">
function validateFreeEmail(email)
{
var reg = /^([\w-\.]+@(?!gmail.com)(?!yahoo.com)(?!hotmail.com)([\w-]+\.)+[\w-]{2,4})?$/
if (reg.test(email)){
return true;
}
else{
return false;
}
}
</script> JQuery - Email address validation with example
<html>
<head>
<script type="text/javascript">
$(document).ready(function(e){
$('#btnSubmit').click(function(){
var email = $('#txtEmail').val();
if ($.trim(email).length == 0) {
alert('Please Enter Valid Email Address');
return false;
}
if (validateEmail(email)) {
alert('Valid Email Address');
return false;
}
else {
alert('Invalid Email Address');
return false;
}});
});
</script>
</head> <body>
Email Address: <input type="text" id="txtEmail"/><br/>
<input type="submit" id="btnSubmit" Value="Submit" />
</body>
</html> Conclusion
Validating email addresses using JavaScript and regular expressions is an efficient way to ensure that user input follows a proper format before processing it. Regular expressions allow developers to quickly check patterns, reduce errors, and enhance form reliability.
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