How to validate an email address in JavaScript

JavaScript is a widely-used programming language today in web development, in both front-end and back-end development, and proper email validation is a must-know skill for every web developer.

When we are developing any website or application in JavaScript, we must create some kind of form from where we are getting the emails from the users. It is very important to validate the input fields.

In this post we’ll talk about very common approaches for validating email addresses in JavaScript. This is a code snippet for basic JavaScript to validate email address using a regular expression.

The Regular expression is

var mailformat = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

Validate it following way.

var emailaddress = document.getElementById("txtEmailAddress").value;

if (mailformat.test(emailaddress) == false)

{

return true;

}else

{

// Show your message here

return false;

}