Haskell and Regex - Why doesn't my function eliminateRedundantSpaces work?

Question

Haskell and Regex - Why doesn't my function eliminateRedundantSpaces work?

import Text.Regex
eliminateRedundantSpaces text =
 subRegex (mkRegex "\\s+") text " "

Answer 1

Text.Regex uses Posix regular expressions , and that doesn't have the \\s abbreviation defined (that is a perl extension that many other implementations have adopted). Instead you can use the [:space:] character group, eg:

eliminateRedundantSpaces text =
   subRegex (mkRegex "[[:space:]]+") text " "