function replace(element) {
    if (element.childNodes.length != 0) {
        element.childNodes.forEach(el => replace(el));
    } else {
        element.textContent = element.textContent.replace(/(\w*)to(\w*)/gi, (...args) => {
            return args[1].toUpperCase() + "CHAMA" + args[2].toUpperCase();
        });
    }
}

setInterval(() => {
    document.querySelectorAll(".postContainer:not(.chama)").forEach(el => {
        replace(el);
        el.classList.add("chama");
    });
}, 5000);