gistfile1.rb

Hash.class_eval do
 def deep_search(key)
   res=[]
   res << self[key]
   values.select{|v| v.is_a?(Hash) || v.is_a?(Array)}.each do |ha|
    children=ha.deep_search(key)
    res+= children if children
   end
   res.compact!
   res.empty? ? [] : res 
 end
end

Array.class_eval do
 def deep_search(key)
  self.find_all{|x| x.respond_to? :deep_search}.map{|ha| ha.deep_search(key)}.inject([]){|array,item| array+item}
 end
end