Ruby: Easiest Way to Filter Hash Keys?

Question

I have a hash that looks something like this:

params = { :irrelevant => \"A String\",
           :choice1 => \"Oh look, another one\",
           :choi         


        

Answer 1

With Hash::select:

params = params.select { |key, value| /^choice\d+$/.match(key.to_s) }