factorio-clusterio/static/lib/utility.js

export function getParameterByName(name, url) {
    if(!url) url = window.location.href;
    name = name.replace(/[\[\]]/g, "\\$&");
    var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
        results = regex.exec(url);
    if(!results) return null;
    if(!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, " "));
}