JSFiddle - React, Tailwind, and code Playground

HTML

<div id="header">
    Sometitle<div>
        <div>
            aa
        </div>
        <div>
            bb
        </div>
    </div>
</div>

JavaScript

headerClone = $("#header").clone();
$(headerClone).find('div').remove();
var currentText = $(headerClone).html().replace(/(\r\n|\n|\r|\t)/gm,"");

newHtml = $("#header").html().replace(currentText,"Gotcha");
$("#header").html(newHtml);