JSFiddle - React, Tailwind, and code Playground

HTML

<div id="root">

</div>

JavaScript

var new_html = "foo and bar(arg)";
    var bad_string = "bar\\(arg\\)";
    var regex = new RegExp(bad_string, "igm");
    var bad_start = new_html.search(regex);
document.getElementById('root').html(bad_start);