Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to do a global search for a substring that contains a sequence of four digits.</p>

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

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

<script>
function myFunction() {
    var str = "100, 1000 or 10000?";
    var patt1 = /\d{4}/g;
    var result = str.match(patt1);
    document.getElementById("demo").innerHTML = result;
}
</script>

</body>
</html>