[Haskell-cafe] Reversing a string of words: C# v Perl V Ruby v Haskell

[Greg Fitzgerald]

Hi Steve,

On 12/11/06, Steve Downey <sdowney at gmail.com> wrote:
> transforming "one two  three four    " into "    four   three  two
one",  how could this be done?

This is a good problem for
Parsec<http://www.cs.uu.nl/%7Edaan/download/parsec/parsec.html>
:

import Text.ParserCombinators.Parsec

reverseWords = concat . reverse . split
   where
      split = fromRight . parse wordsSpaces ""
      fromRight (Right s) = s
      wordsSpaces = many (many1 space <|> many1 alphaNum)

-Greg
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