JSFiddle - React, Tailwind, and code Playground

HTML

<p>Type some integers separated by commas, spaces, newlines, etc.</p>
<textarea id="text"></textarea>
<p id="results">IDs found will go here once you start typing.</p>

CSS

textarea {
    width: 100%;
    height: 150px;
}

JavaScript

var textarea=$("#text");
$.each(["keydown", "keyup", "change"], function(i, ev) {
    textarea.bind(ev, function() {
        parse();
    });
});
parse();

function parse() {
    var text=textarea.val();
    var results=$.map(text.split(/[^\d]+/), function(item) {
        var num=parseInt(item, 10);
        if(isNaN(num)) {
            return null;
        }
        return num;
    });
    $("#results").text(JSON.stringify(results));
}