I have been learning haskell, it would be nice to be able to leverage my perl knowledge in a haskell context.

The first thing I would like to be able to do is use the =~ s/// regex replacement structure in a haskell program. That would give you in one fell swoop

haskell one liners with nearly all the power and elegance of perl!

eg, snipping from the link above:

time cat /usr/share/dict/american-english | ghc -e 'interact $
unlines. take 10 . filter ( \x -> x =~ "^q" :: Bool ) . lines'
ImportsRegexPCRE.hs

thartman@linodewhyou:~/learning/haskell/UnixTools$ cat ImportsRegexPCR
+E.hs
import Text.Regex.PCRE
[download]

Well, ok. The above link gives you haskell one liners with PCRE match, but not perl style =~ s/// replace. However, with the ability to access the perl6 regex lib, of course, you would have that too.

It might be slow, I can imagine, but still... cool as hell.

UPDATE: 2 years later, I asked this again at how to hack on pugs in ghci? how to use perl6 regexen and grammars in haskell?