Regex to detect urls with '?' character at the end

Regex to detect urls with '?' character at the end

I found many solutions, but none was useful for me.
Let's say, as an example, I want to find URLs that start with www. and end
with a space or ?. In this case, I really mean it ends in a ?, not that
it's necessarily a CGI-related URL.
I'm trying to use the regex
var r = /(^|[\s\?])(www\..+?(?=([\s]|\?|($))))/g;
My sample use: http://jsfiddle.net/DKNat/2/
How can I use \? in a regex to prevent the end of the URL containing /
before ??