How to get the file extension from a url?

Question

New to ruby, how would I get the file extension from a url like:

http://www.example.com/asdf123.gif

Also, how would I format this string, in c#

Answer 1

url = 'http://www.example.com/asdf123.gif'
extension = url.split('.').last

Will get you the extension for a URL(in the most simple manner possible). Now, for output formatting:

printf "http://www.example.com/%s.%s", filename, extension