Disini saya contohkan untuk replace format tanggal/time
<!DOCTYPE html>
<html>
<body>
<p id="paket">10m</p>
<script>
var str = document.getElementById("paket").innerHTML;
var mapObj = {
d:" hari",
h:" jam",
m:" menit",
s:" detik"
};
res = str.replace(/d|h|m|s/gi, function(matched){
return mapObj[matched];
});
document.getElementById("paket").innerHTML = res;
</script>
</body>
</html>