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Today's Topics:
1. Re: Question about Regular expression pattern consuming.
(Julian Arni)
----------------------------------------------------------------------
Message: 1
Date: Sun, 28 Jul 2013 22:50:52 -0400
From: Julian Arni <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Question about Regular expression
pattern consuming.
Message-ID:
<canct4crfsaxv8ecm9tvrfmomsd31qhntyfje6vj3zknszwg...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
splitRegex treats the regex as a delimiter, and does it fact "swallow" the
match. Use matchRegexAll instead - e.g.:
1 import Text.Regex
2 import Control.Applicative
3
4 main :: IO()
5 main = do
6 myIn <- readFile "Data.dat"
7 case (intoEachPt myIn) of
8 Nothing -> print "No match"
9 Just (a, b, c, d) -> do print a
10 print b
11 print c
12
13 intoEachPt :: String -> Maybe (String, String, String, [String])
14 intoEachPt = matchRegexAll (mkRegex "20[0-9]{13}AH021")
On Sun, Jul 28, 2013 at 5:35 AM, S. H. Aegis <[email protected]> wrote:
> Hi.
> I'm newbie to Haskell.
> I want to get date, it's type is [[String]].
> The problem is that "the string that is used in regular expression
> pattern" is consumed. ie, disappear.
> Here is my code.
>
> ------------------------------------------------------------
> import Text.Regex
> import Control.Applicative
>
> main :: IO()
> main = do
> myIn <- readFile "Data.dat"
> print $ lines <$> intoEachPt myIn
>
> intoEachPt :: String -> [String]
> intoEachPt = splitRegex (mkRegex "20[0-9]{13}AH021")
> -----------------------------------------------------------
>
> How can I fix this?
>
>
> Data:
> ....there is many DIGIT.....201306000300001AH02112361640
> 9.......
>
> Output:
> [[....there is many DIGIT..."],["12361640 9......]....]
>
> I hope:
> [[....there is many DIGIT..."],["201306000300001AH02112361640
> 9......]....]
>
> _______________________________________________
> Beginners mailing list
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> http://www.haskell.org/mailman/listinfo/beginners
>
>
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