JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Test</h1>
<h1>Test Lagi</h1>
<h1>Tefst Lagi ah</h1>

CSS

span {background:yellow}

JavaScript

$(function(){
    $('h1').each(function(){
       var me = $(this);
        if(/(\W+)/.test(me.html())) {
          me.html(me.html().replace(/^(\w+)/, '<span>$1</span>'));
        }
    });
});