class Hash
  def fetch_path path
    path.split('/').drop(1).inject(self) do |hash, key| 
      if scan = key.scan(/\[[\d+]\]/).first
        key.sub! scan, ''
        idx = scan.scan(/\d+/).first.to_i
        hash.respond_to?(:has_key?) && hash.has_key?(key) ? hash[key][idx] : break
      else
        hash.respond_to?(:has_key?) && hash.has_key?(key) ? hash[key] : break
      end
    end
  end
  
  def select_keys *keys
    select { |k, _| keys.include? k }
  end
  
  def has_entries? entries
    entries.each_pair.all? { |k, v| self[k] == v }
  end
end