Find out how to validate an email address in JavaScript.

We can use Regular Expression to check if an email address is valid.

The regular expression /^([a-zA-Z0-9_.-])+\@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/ check if an email address is in the format address@domainname.tld.

function checkMail(email){
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(email)) {
		return true;
	}
	return false;
}