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Yes. The list is generated lazily and ordered from shortest to longest, though, so piping the output to "|head -n 100" will terminate rather quickly.

The ([String] -> IO [String]) API also generated a lazy list:

    http://hackage.haskell.org/packages/archive/regex-genex/0.2.0/doc/html/Regex-Genex.html
so one can take only part of the output like this:
   Regex.Genex> fmap (take 5) (genex ["([abc]+)\\1"])
   ["bb","cc","aa","bbbb","cccc"]
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