Execution example::

  select Entries --filter 'content @~ ".roonga"'
  # [
  #   [
  #     0, 
  #     1337566253.89858, 
  #     0.000355720520019531
  #   ], 
  #   [
  #     [
  #       [
  #         2
  #       ], 
  #       [
  #         [
  #           "_id", 
  #           "UInt32"
  #         ], 
  #         [
  #           "_key", 
  #           "ShortText"
  #         ], 
  #         [
  #           "content", 
  #           "Text"
  #         ], 
  #         [
  #           "n_likes", 
  #           "UInt32"
  #         ]
  #       ], 
  #       [
  #         2, 
  #         "Groonga", 
  #         "I started to use Groonga. It's very fast!", 
  #         10
  #       ], 
  #       [
  #         3, 
  #         "Mroonga", 
  #         "I also started to use Mroonga. It's also very fast! Really fast!", 
  #         15
  #       ]
  #     ]
  #   ]
  # ]
