JavaScript URL parser

parseUrl.js

/**
 * parseUrl
 * Copyright (c) 2012, marlun78
 * MIT License, https://gist.github.com/marlun78/bd0800cf5e8053ba9f83
 * 
 * Needs to run in a browser, uses String.prototype.lastIndexOf method.
 * Regexp stolen from: http://stevenbenner.com/2010/03/javascript-regex-trick-parse-a-query-string-into-an-object/
 */
var parseUrl = (function (element) {
    
    var fileName, pathName, pathNames, query,
        re = /([^?=&]+)(=([^&]*))?/g;
    
    function parseQuery (query) {
        var obj = {};
        query.replace(re, function (match, group1, offset, string) {
            obj[group1] = decodeURIComponent(string);
        });
        return obj;
    }
    
    return function (url) {
        element.href = url;
        pathName = element.pathname;
        if (pathName === '/') {
            pathNames = [];
            fileName = '';
        } else {
            pathNames = pathName.substr(1).split('/');
            fileName = pathNames[pathNames.length - 1];
        }
        query = element.search;
        
        return {
            fileExtension: fileName.substr(fileName.lastIndexOf('.')),
            fileName: fileName,
            hash: element.hash,
            host: element.host,
            hostName: element.hostname,
            pathName: pathName,
            pathNames: pathNames,
            port: element.port,
            protocol: element.protocol,
            query: query,
            queryData: query.length > 0 ? parseQuery(query) : null,
            url: url
        };
    };

}(document.createElement('a')));

//console.clear();
//console.dir(parseUrl('http://sub.example.com:8042/over/there/index.dtb?type=animal&name=narwhal#nose'));