JSFiddle - React, Tailwind, and code Playground
HTML
<div class='price'>$ 270.30</div>
<div class='price'>eur 64.60</div>
<div class='price'>€ 290.12</div>
<div class='price'>dollars 240.50</div>JavaScript
$.each($('.price'), function(){
var price = $(this).html();
$(this).html(price.replace(/(\D*)(\d*\.)(\d*)/,'<span style="font-size:16px;">$1</span><span style="font-size:22px;">$2</span><span style="font-size:14px;">$3</span>'));
});