JSFiddle - React, Tailwind, and code Playground

HTML

<div class="test" id="tony" ></div>
<div class="test" id="tony_1" ></div>
<div class="test" id="ton" ></div>
<div class="test" id="tony_2" ></div>
<div class="test" ></div>

JavaScript

jQuery.expr.filters.isTony = function(elem){
      return elem.id && elem.id.indexOf("tony") != -1;
}
$(document.body).append("div:isTony #=> "+$("div:isTony").length);