JSFiddle - React, Tailwind, and code Playground

HTML

<div id="result">...</div>

JavaScript

String.prototype.replaceAll = function (find, replace) {
    var str = this;
    return str.replace(new RegExp(find.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&'), 'g'), replace);
};

string = "hello$&. world";
string = string.replaceAll('hello$&.', 'hello');
$('#result').html(string);