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 #- } -- Due to Haddock limitation, spaces are inserted after and before "}". -- Remove them if you copy this. import Text.Regex.Literal import Text.Regex.Posix -- Regular expression as the regular expression literal regexp :: Regex regexp = [$re|\\(foo)\\(bar\.c)|] -- 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.
- re :: QuasiQuoter
Documentation
A QuasiQuoter
function to implement regular expression literal.