Javascript working in everything but IE

Hello, 

I'm aware that E-LH don't support Javascript, but... I was wondering if anyone else had come across an issue with Javascript not running in Internet Explorer or Edge? Everything works fine on PC and Mac Chrome/Firefox/Safari, it's just that IE refuses to action any of the JS or present any errors.

Is this a problem that IE has with JS? Has anyone come across it before?

Here is my code that grabs the name from the URL and sets a variable:

 function gup( name )
{
name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
var regexS = "[\\?&]"+name+"=([^]*)";
var regex = new RegExp( regexS );
var results = regex.exec( window.location.href );
if( results == null )
return "";
else
return results[1];
}

var player = GetPlayer();

var sid = gup("u");
var sname = gup("f");

player.SetVar("uuid",sid);
player.SetVar("StudentName",sname);
}

Many thanks in advance,
Adam

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