How to get js value of sparged page variable?

Question

Parsing

Good afternoon.
I want to translate one resource for myself, as well as send it offline.
The pages have an iframe that contains html with the required variable.
The variable is contained in a closed js function.
What is the best way to get it?
Initially, for parsing, I use webdriver in conjunction with php.

(function(document, player) {
var config = {} 
}(document, document.getElementById('player')));

That's exactly the contents of the config variable needed. Other contents inside may vary

Answer 1

Solved the problem by writing a regular expression.