Tryit Editor v2.7

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to return the function that created the RegExp object's prototype.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var patt = new RegExp("Hello World", "g");
    var res = patt.constructor;
    document.getElementById("demo").innerHTML = res;
}
</script>

</body>
</html>