Javascript regex in firefox extension

Question

What could be going wrong here? The problem seems to be with the regex match statement. without it the alerts come, but as soon as I put it in everything goes quiet. Thanks so much! the wildcard is simply to help pinpoint the problem, it is NOT the objective, i do need regex.

window.addEventListener("load", function() { myExtension.init(); }, false);

var myExtension = {
  init: function() {
    var appcontent = document.getElementById("appcontent");   // browser
    if(appcontent)
      appcontent.addEventListener("DOMContentLoaded", myExtension.onPageLoad, true);
    var messagepane = document.getElementById("messagepane"); // mail
    if(messagepane)
      messagepane.addEventListener("load", function () { myExtension.onPageLoad(); }, true);
  },

  onPageLoad: function(aEvent) {
    var doc = aEvent.originalTarget; // doc is document that triggered "onload" event
    // do something with the loaded page.
    // doc.location is a Location object (see below for a link).
    // You can use it to make your code executed on certain pages only.

    var url = doc.location;  // i have also tried doc.location.href

    if (url.match(.*)) {alert( url );}

  }
}

Answer 1

match takes a regexp object. A regexp object can be constructed with a literal of form /regex here/ (note the slashes).

With your code you should see a syntax error reported to the Error Console.

[edit] to be 100% clear, you need .match(/.*/) instead of .match(.*).