Matching atleast N digits in JavaScript

How to match any string that contains a sequence of atleast N digits in a string in JavaScript?

By using d{N,} quantifier we can match any string that contains a sequense of at least N digits in a string.

NOTE: Atleast means exactly or more, eg: atleast 5 means 5 or more.

\d is the Metacharacter, which is used to find a digit.
{N,} is the input value and it must be a number.

<p>Click the below button to match a sequence of atleast 4 digit number.</p>
<input type="button" value="Click" onclick="mySearch()" />
<p id="myId"></p>

<script>
    function mySearch() {
        var a = "525245, 4527, 651, 78452, 35, 4, 548624";
        var b = /\d{4,}/g;
        var r = a.match(b);
        document.getElementById("myId").innerHTML = r;
    }
</script>

In the above code snippet we have given Id as "myId"to the second <p> element in the HTML code. There is a function mySearch() in the<script>block which is connected to the onclick of the HTML button and there is a string with value "525245, 4527, 651, 78452, 32, 4, 548624" to the variable a, we need to match any string that contains a sequence of atleast N digits, for that we are using d{N,} quantifier in variable b. var b = /\d{4,}/g here \d is the metacharacter for finding a digit, {4,} is the input value of {N,} for matching any string that contains a sequence of atleast 4-digit numbers and g do the global search in a string, varaible r returns the matched sequence result. Onclick of the button "Click" in the HTML code fires the function mySearch() in the <script> block at the same time d{N,} quantifier matches any string that contains a sequence of atleast N digits (N=4 & N,=4 or more) in a string with the help of global search g and gives the output.