JSFiddle - React, Tailwind, and code Playground

HTML

&copy

JavaScript

var $div = $("<div>");

$.expr[":"].containsEnc = function(a, b, c, d) {
    var decoded = $div.html(c[3]).text();
    
    return ~a.textContent.indexOf(decoded);
};

$('body:containsEnc("&copy")').html('ok');