How to validate domain name using jQuery ?

This following JavaScript function helps you to check whether the domain name is valid or not using RegExp.

function IsvalidDomain(domainName) {
        if (domainName!= null && domainName!= undefined) {
            var pattern = new RegExp(/[^w{3}.]([a-zA-Z0-9]([a-zA-Z0-9-]{0,65}[a-zA-Z0-9])?.)+[a-zA-Z]{2,6}/igm);
            return pattern.test(domainName);
        }
        else {
            return false;
        }
    }