This is how I would do it: recurse down the input string. use isPrefixOf to check is the string youw ant to replace is at the head of the string. if it is, 'drop' the appropriate number of characters and stick the replacement string on the front. then recurse. this should be about 3 lines of code. -- Hal Daume III | hdaume@isi.edu "Arrest this man, he talks in maths." | www.isi.edu/~hdaume On Thu, 13 Mar 2003, Alexandre Weffort Thenorio wrote:
OK Guys. First I would like to say thanks for all the help given before. As I said I am still learning Haskell. My problem is the following:
I have a text file and somewhere in the file there is string (Let's say aaaa). So I need to find this exact string and overwrite with another string (Lets say bbbb).
I have thought a bit and couldn't find any solution, and I believe it is a piece of cake for some of you. Is there a method already implemented in haskell to do that?? Anyway thanks in advance.
Best Regards
NooK
----- Original Message ----- From: "Arthur Baars" <arthurb@cs.uu.nl> To: <haskell@haskell.org> Cc: "Norman Ramsey" <nr@eecs.harvard.edu> Sent: Wednesday, March 12, 2003 1:06 AM Subject: Re: clueless GHCI user wishes to load QuickCheck
QuickCheck is in de "util" package. You can load a package with the -package flag:
$ ghci -package util Prelude> :browse QuickCheck class Arbitrary a where { arbitrary :: Gen a; coarbitrary :: forall b. a -> Gen b -> Gen b; } arbitrary :: forall a. (Arbitrary a) => Gen a ... Prelude>:module QuickCheck
Prelude QuickCheck> :info trivial -- trivial is a variable trivial :: forall a. (Testable a) => Bool -> a -> Property
Hope this helps.
Cheers,
Arthur
On Tuesday, March 11, 2003, at 07:02 PM, Norman Ramsey wrote:
Can anyone help me figure out how to load QuickCheck into GHCI? QuickCheck is included in my Debian package, but my attempts at loading it are bootless:
Prelude> :load QuickCheck can't find module `QuickCheck' Prelude> :load util/QuickCheck can't find module `util/QuickCheck' Prelude> :info syntax: `:i <thing-you-want-info-about>' Prelude> :load util/QuickCheck.hi can't find module `util/QuickCheck.hi' Prelude> :load /usr/lib/ghc-5.02.2/imports/util/QuickCheck.hi can't find module `/usr/lib/ghc-5.02.2/imports/util/QuickCheck.hi' Prelude> :load /usr/lib/ghc-5.02.2/imports/util/QuickCheck can't find module `/usr/lib/ghc-5.02.2/imports/util/QuickCheck' Prelude>
Any advice, anyone?
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