JSFiddle - React, Tailwind, and code Playground

HTML

<h2>Birds - Norwegian Yellow Finch</h2>
<h2>Cats - Domestic Shorthaired Tabby</h2>
<h2>22 / 39 Main Road</h2>

<hr>
<button id="run">Run it</button>

JavaScript

var re = /^[^/]s*/;

function processText(el) {
    el.textContent = el.textContent.replace(re, '');
}


document.getElementById('run').onclick = function() {
    var elements = document.getElementsByTagName('h2');
    for(var i = 0, l = elements.length; i <= l; i++) {
        var elements = elements.replace(re, '');
    }
    console.log(a);
};