JSFiddle - React, Tailwind, and code Playground

HTML

<p id = "text">
        Lorem ipsum dolor sit amet.
    </p>
    <p id = "result"># of vowels: <span></span></p>

JavaScript

$(function() {
        var vowelsCount = $("#text").text().match(/[aeiou]/gi).length;
        $("#result > span").html(vowelsCount);
    });