Get domain name without subdomains using JavaScript?

Question

How to get the domain name without subdomains?

e.g. if the url is \"http://one.two.roothost.co.uk/page.html\" how to get \"roothost.co.uk\"?

Answer 1

What about...

    function getDomain(){
        if(document.domain.length){
            var parts = document.domain.replace(/^(www\.)/,"").split('.');

            //is there a subdomain? 
            while(parts.length > 2){
                //removing it from our array 
                var subdomain = parts.shift();
            }

            //getting the remaining 2 elements
            var domain = parts.join('.');

            return domain.replace(/(^\.*)|(\.*$)/g, "");
        }
        return '';
    }