Checking if userinput is a valid URI in XUL

Is there an built-in function/method that can check if a given string is a valid URI or not in the Mozilla XUL toolkit. (I have looked for one but found none, but since this is my first time using XUL and it's documentation it could be that I just overlooked it. So I'm just making sure before I start writing my own IsValidURI function)

From stackoverflow KCasier

• The nsIIOService.newURI(...) method is what you're looking for. It throws NS_ERROR_MALFORMED_URI if the URI string is invalid.

  Example:

  try {
    var ioServ = Components.classes["@mozilla.org/network/io-service;1"]
                           .getService(Components.interfaces.nsIIOService);
    var uriObj = ioServ.newURI(uriString, uriCharset, baseURI);
  } catch (e) {
  
    // catch the error here
  
  }
  

  From David Crow