[mbudde]

There's this example from the README which seems to do what you are asking for:

    Maid.rules do
      rule 'Old files downloaded while developing/testing' do
        dir('~/Downloads/*').each do |path|
          if downloaded_from(path).any? {|u| u.match 'http://localhost'} && 1.week.since?(last_accessed(path))
            trash(path)
          end
        end
      end
    end