How to extract some text?

[Oltmans]

I'm at a loss to figure out how to extract some text from a string.
Here is a string:

setTimeout("location.href='http://youtube.example.com/login.aspx'",
5000);

and I want to only retrieve the URL from above i.e I only want this
http://youtube.example.com/login.aspx from the above string. Any ideas/
help is highly appreciated.

Thanks,
Oltmans