JSFiddle - React, Tailwind, and code Playground

HTML

<div id = "fb-timeline-cover-name">

The line contain asdfssgasdf in plain text
</div>

JavaScript

var str = document.getElementById("fb-timeline-cover-name").innerText;

var res = str.match(/asdfssgasdf/g);

document.write('<pre>'+res+'</pre>');