JSFiddle - React, Tailwind, and code Playground

HTML

<p><span>The quick  fox</span></p>
<p><span>Jumped over the lazy dog</span></p>

CSS

.red { color:#ff0000 }

JavaScript

$(function(){
   
$("span").html(function(i,text){
    return text.replace(/\w+\s/, function(match){
        return '<span class="red">' + match + '</span>'; 
    });
});
    
});