test/Regex/stackregex_box.js

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------


function test()
{
    var r = /a/;
    var r2 = r;
    var str = "a";
    WScript.Echo(r.exec(str));
    WScript.Echo(r === r2);
}

test();
test();
var g;
var oldExec = RegExp.prototype.exec;
RegExp.prototype.exec = function(str)
{
    g = this;
}
test();

WScript.Echo(oldExec.call(g, "a"));