JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1">
    <span data-expando="AA,BB">my span</span>
</div>
<div id="result1"></div>
<div id="div2">
    <span data-expando="AABB">my span</span>
</div>
<div id="result2"></div>

JavaScript

var div = $('#div1');
var span = div.find('span[data-expando="AA\\,BB"]');
$('#result1').html(span.length ? "Found !" : "Not found");

var div = $('#div2');
var span = div.find('span[data-expando="AABB"]');
$('#result2').html(span.length ? "Found !" : "Not found");