What userAgent do I need for the method to return true?

function browser_is_IE11() {
  var ua = window.navigator.userAgent;
  var msie = ua.indexOf("MSIE ");
  var rv = -1;

  if (msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./)) {
    // If Internet Explorer, return version number
    if (isNaN(parseInt(ua.substring(msie + 5, ua.indexOf(".", msie))))) {
      //For IE 11 >
      if (navigator.appName == 'Netscape') {
        var ua = navigator.userAgent;
        var re = new RegExp("Trident/.*rv:([0-9]{1,}[\.0-9]{0,})");
        if (re.exec(ua) != null) {
          rv = parseFloat(RegExp.$1);
          if (rv == 11) {
            return true;
          }
        }
      }
    }
  }
  return false;
}