JSFiddle - React, Tailwind, and code Playground
JavaScript
var c = "var aa 12134 Lazaro function Contreras var p for Olague holas";
var e = /for|function|if|elseif|in/gi;
var a = c.match(e);
for(var b in a){
c = c.replace(a[b],"["+a[b]+"]");
}
var v = /(var)\s+(\w)+\s+(\d+|\w+|)/gi;
var s = c.match(v);
for(var b in s){
c = c.replace(v,"[$1 $2, $3]");
}
console.log(c);