String Replace
JavaScript
var sessions = 10;
var usage = "2 GB";
var str = "Connected to Service XXX time(s) \n Used more than YYY of data";
str = str.replace(/,|.|-|_|&|%|!|#|\^|\$|\(|\)|\?|\*|\+|\\|\//g, sessions);
str = str.replace("YYY", usage);
console.log(str);