Regex pattern to capture the domain and params of a URL

urlParseRegex.js

//  Regex: 
//    /(?:https?:\/\/)?(?:www\.)?([-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6})(?:[:]?[0-9]{0,5})([-a-zA-Z0-9@:%_\+.~#?&\/=]*)/i

function extractUrlParts(url) {
    var matches = 
        /(?:https?:\/\/)?(?:www\.)?([-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6})(?:[:]?[0-9]{0,5})([-a-zA-Z0-9@:%_\+.~#?&\/=]*)/i
            .exec(url);
    return {
        domain: matches && matches[1],
        params: matches && matches[2]
    }
}

var testUrls = [
    "/Relative/Path",
    "http://www.youtube.com/watch?v=lXMskKTw3Bc",
    "https://www.youtube.com/watch?v=lXMskKTw3Bc",
    "www.youtube.com/watch?v=lXMskKTw3Bc",
    "ftps://ftp.place.com/dir/file.txt",
    "ftps://place.com:1234/dir/file.txt",
    "place.com:1234/dir/file.txt",
    "https://jdmallen.github.io/jest/"
];

for (var i = 0; i < testUrls.length; i++){
    document.write("<h4>URL: " 
                   + testUrls[i] + "</h4><b>Domain: </b>" 
                   + extractUrlParts(testUrls[i]).domain + "<br/><b>Params: </b>" 
                   + extractUrlParts(testUrls[i]).params);
}

jsbin to test the above

Work largely based on this StackOverflow answer. The RegEx was changed to include port numbers and change the capture groups.