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

If you want the remaining hash:

params.delete_if {|k, v| ! k.match(/choice[0-9]+/)}

or if you just want the keys:

params.keys.delete_if {|k| ! k.match(/choice[0-9]+/)}