Split variable from last slash

You can use lastIndexOf to get the last variable and that to get the rest.

var rest = str.substring(0, str.lastIndexOf("https://stackoverflow.com/") + 1);
var last = str.substring(str.lastIndexOf("https://stackoverflow.com/") + 1, str.length);

Example on jsfiddle.

var str = "var1/var2/var3";

var rest = str.substring(0, str.lastIndexOf("https://stackoverflow.com/") + 1);
var last = str.substring(str.lastIndexOf("https://stackoverflow.com/") + 1, str.length);
console.log(rest);
console.log(last);