split string based on a symbol

Question

I'm trying to split a string into an array based on the second occurrence of the symbol _

var string = "this_is_my_string";

I want to split the string after the second underscore. The string is not always the same but it always has 2 or more underscores in it. I always need it split on the second underscore.

In the example string above I would need it to be split like this.

var split = [this_is, _my_string];

Answer 1

var string = "this_is_my_string";
var firstUnderscore = string.indexOf('_');
var secondUnderscore = string.indexOf('_', firstUnderscore + 1);
var split = [string.substring(0, secondUnderscore),
             string.substring(secondUnderscore)];

Paste it into your browser's console to try it out. No need for a jsFiddle.