BuddyPress.org

I am attempting to create a redirect in my login form. When a user registers they will pick their default city for their profile. I want to take this information and use it in the redirect link so when a user logs in, it will direct them to the activity of their city. For example the URL would look something like this:

http://www.example.com/pittsburgh

I just need to be able to generate the “pittsburgh” portion on a per user basis and based on their city field in the profile.

Any ideas?