* Ilya Portnov <port...@iportnov.ru> [2012-01-29 01:26:29+0500]
> Hi haskell-cafe.
>
> Is there a way to get named captures from regex using regex-pcre (or
> maybe other PCRE-package)? For example, I want to write something
> like
>
> let result = "ab 12 cd" =~ "ab (?P<number>\d+) cd" :: SomeCrypticType
>
> and then have namedCaptures result == [("number", "12")].
>
> I do not see somewhat similar in regex-pcre documentation. It parses
> such regexs fine, and captures work, but i do not see way to get
> _named_ captures.
Try the regex-applicative package.
{-# LANGUAGE OverloadedStrings #-}
import Text.Regex.Applicative
import Data.Char
main = print $
"ab 12 cd" =~ "ab " *> some (psym isDigit) <* " cd"
You can combine several captures into, say, a record using the
Applicative instance and thus emulate named captures semantics.
--
Roman I. Cheplyaka :: http://ro-che.info/
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