gistfile1.rb

def s3_find(filename)
  keys = s3.directories.map do |directory|
    directory.files.map do |file|
      file.key if file.key =~ /.*#{filename}.*/
    end
  end

  keys.flatten.compact
end

## OR ##

def s3_find(filename)
  s3.directories.map{|directory|
    directory.files.map{|file|
      file.key if file.key =~ /.*#{filename}.*/
    }
  }.flatten.compact
end