JSFiddle - React, Tailwind, and code Playground

JavaScript

function lerCookie(nome) {
    var regex = new RegExp('(?:(?:^|.*;\s*)' + nome + '\s*\=\s*([^;]*).*$)|^.*$');
    return document.cookie.replace(regex, "$1");
}
document.cookie = 'MeuCookie=SOpt;';
console.log(lerCookie('MeuCookie'));