Literal notation for regular expression.

Importing this module with the QuasiQuotes and OverloadedStrings extensions making possible to directly specify reqular expression literal. This means that awkward backslashes are not necessary.

You can copy a regular expression in other languages and paste it to your Haskell program.

Sample code:

 {-# LANGUAGE QuasiQuotes, OverloadedStrings #-}

 import Text.Regex.Literal
 import Text.Regex.Posix

 -- Regular expression as the regular expression literal
 regexp :: Regex
 regexp = [$re|\\(foo)\\(bar\.c)|]

Compare with regular expression as the String literal.

 regexp :: Regex
 regexp = makeRegex ("\\\\(foo)\\\\(bar\\.c)" :: String)

GHC 6.12.3 or earlier requires the dollar sign before "re".

GHC 7.0.1 does not allow the dollar sign before "re".

GHC 7.0.2 or later allows the dollar sign before "re" as an obsoleted syntax.

So, use GHC other than 7.0.1 and specify the dollor sign for portability.