JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.0/jquery.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.maskedinput/1.4.1/jquery.maskedinput.min.js"></script>
<form>
<input type="text" name="search" id="search" placeholder="Escreva o nĂşmero de processo aqui..." required maxlength="5">
</form>

JavaScript

$(document).ready(function(){
            $("#search").mask("99999");
        });