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Asked: 2026-05-27T08:47:37+00:00

There are several packages available for the usage of regular expressions in Haskell (e.g.

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There are several packages available for the usage of regular expressions in Haskell (e.g. Text.Regex.Base, Text.Regex.Posix etc.). Most packages I’ve seen so far use a subset of Regex I know, by which I mean: I am used to split a sentence into words with the following Regex:

\\w+

Nearly all packages in Haskell I tried so far don’t support this (at least the earlier mentioned and Text.Regex.TDFA neither). I know that with Posix the usage of [[:word:]+] would have the same effect, but I would like to use the variant mentioned above.

From there are two questions:

  1. Is there any package to archive that?
  2. If there really is, why is there a different common usage?
  3. What advantages or disadvantages are there?
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1 Answer

  1. Editorial Team

    The ‘\w’ is a Perl pattern, and supported by PCRE, which you can access in Haskell with my regex-pcre package or the pcre-light library. If your input is a list of Char then the ‘words’ function in the standard Prelude may be enough; if your input is ASCII bytestring then Data.ByteString.Char8 may work. There may be a utf8 library with word splitting, but I cannot quickly find it.

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