JavaScript Email Address validation using Regular Expression

JavaScript Email Address validation using Regular Expression

01 Feb 2024
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.

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> 

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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> 

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What do you think?

In this article I try to explain, how you can validate different-different email address acc. to your need. I hope after reading this article you will be able to use this trick in your code. I would like to have feedback from my blog readers. Please post your feedback, question, or comments about this article.

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About Author
Shailendra Chauhan (Microsoft MVP, Founder & CEO at Scholarhat by DotNetTricks)

Shailendra Chauhan is the Founder and CEO at ScholarHat by DotNetTricks which is a brand when it comes to e-Learning. He provides training and consultation over an array of technologies like Cloud, .NET, Angular, React, Node, Microservices, Containers and Mobile Apps development. He has been awarded Microsoft MVP 8th time in a row (2016-2023). He has changed many lives with his writings and unique training programs. He has a number of most sought-after books to his name which has helped job aspirants in cracking tough interviews with ease.
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