Michael,

Here is how I do it.


> module Main where

> import Text.Regex.Posix.ByteString
> import Data.Maybe
> import qualified Data.ByteString.Char8 as S

> text = S.pack "11\n abcd \n22"
> p = S.pack "11\n(.*)\n22"


> main :: IO ()
> main =
>  do  { (Right pat) <- compile compExtended execBlank p
>      ; res <- regexec pat text
>      ; case res of
>          { (Right (Just (_,_,_,m))) -> putStrLn (show m)        
>          ; _                        -> putStrLn "not matched."
>          }
>      }

You may swap out ByteString with String,
PCRE should be similar, too.

Regards,
Kenny


On Wed, Nov 4, 2009 at 2:04 PM, Michael Mossey <mpm@alumni.caltech.edu> wrote:


kenny lu wrote:
Hi Michael,

Could you give an example of what patterns you want to write?

Regards,
Kenny


Something like

text = "11\n abcd \n22"
answer = text =~ "11.*22" :: <various possibilities>

and have it find the entire string. The default behavior is to stop matching when it encounters a newline. There is mention in the Text.Regex.Posix docs of a flag to control this behavior, but it is not easy to figure out from the docs how to provide flags. The left-hand side of the =~ is a very complex type.





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