userscript: Drop the UTM params from a URL when the page loads

utmstrip.user.js

// ==UserScript==
// @name          UTM param stripper
// @author        Paul Irish, Sam Hasler, Lomanic
// @namespace     http://github.com/paulirish
// @version       1.3
// @description   Drop the UTM params from a URL when the page loads.
// @extra         Cuz you know they're all ugly n shit.
// @include       /^http.*\?.*[?&]utm_.*$/
// @run-at        document-start
// @updateURL     https://gist.github.com/Lomanic/cf1158a9bfb90d8b5dbbb4d05483e857/raw/utmstrip.user.js
// @downloadURL   https://gist.github.com/Lomanic/cf1158a9bfb90d8b5dbbb4d05483e857/raw/utmstrip.user.js
// ==/UserScript==


// Update: 
// In chrome, it's better to just install the UTM stripper chrome extension:
//   https://chrome.google.com/webstore/detail/google-analytics-paramete/jbgedkkfkohoehhkknnmlodlobbhafge

// It is great and open source:  github.com/mihaip/utm-stripper

// You can also install this greasemonkey script if you really want.
// download this script. go to about:extensions. Turn on developer mode and drag and drop
//    this file onto the window. it'll install it.  hopefully.


// lastly, if your site / marketing funnel uses these tracking tokens. you can clean up your users URLs
// look at the comments below on correct installation to integrate with __gaq.push

if (/utm_/.test(location.search) && window.history.replaceState){  
  var oldUrl = location.href;
  var search = location.search.substr(1).split('&').filter(function(v){
    return !/^utm_/.test(v) && v;
  }).join('&');
  search = search ? '?' + search : '';
  var newUrl = location.protocol + '//' + location.hostname + location.pathname + search + location.hash;

  if (newUrl != oldUrl) {
    window.history.replaceState({},'', newUrl); 
  }
}