JSFiddle - React, Tailwind, and code Playground

HTML

<div>TEXT</div>

JavaScript

jQuery.expr.filters.icontains = function(elem, i, m) {
        return (elem.innerText || elem.textContent || "").toLowerCase().indexOf(m[3].toLowerCase()) > -1;
    }
        
       console.log( $("div:icontains('text')"));