JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo">@ericafustero Why thank you. Your work looks awesome by the way! @treemelody</div>

CSS

.s{ color: red; }

JavaScript

$(function(){

    $('#foo').html( function(){return $(this).html().replace(/(@\w+)/g, "<span class='s'>$1</span>")})
})