[Haskell-cafe] RE: Haskell-Cafe Digest, Vol 21, Issue 31

[Atwood, John Wesley]

> Date: Wed, 11 May 2005 17:22:25 -0400 (Eastern Standard Time)
> From: "S. Alexander Jacobson" <alex at alexjacobson.com>
> Subject: [Haskell-cafe] subRegex bug?
> 
> Am I misunderstanding the regex docs?
> 
> *MyMod> subRegex (mkRegex "\\." ) "foo.bar" "blah"
> "foo*** Exception: Text.Regex.Posix.regcomp: error in pattern
>

Under my Linux install, with ghc6.4, it doesn't throw an exception, but
also doesn't return a correct result;
it returns Just [].  Under WindowsXP, ghc6.4, I get the exception you
get; under hugs, it can't find subRegex, but
matchRegex returns Just [].  What does seem to work is
  > import Text.Regex.Posix
  > 
  > p1 = do
  >  r <- regcomp "\\." 0
  >  b <- regexec r "foo.bar"
  >  putStr (show b)

why it's in the IO monad, I don't know.
Where would I find the source? I browsed the ghc cvs at haskell.org, but
can't find Text.Regex.


John