JSFiddle - React, Tailwind, and code Playground

by Oleg Lazarev

HTML

<style>
	:invalid { background: red; }
	:valid { background: green; }
</style>
<input pattern="a.b" value="aXXb"><!-- получаем красный background -->
<input pattern="a.b" value="a𝌆b"><!-- получаем зеленый background -->