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README
HaskellVerbalExpressions
Haskell Regular Expressions made easy
VerbalExpressions is a Haskell library that helps to construct difficult regular expressions.
This haskell lib is based off of the (original) Javascript VerbalExpressions library by jehna.
Other Implementations
You can see an up to date list of all ports on VerbalExpressions.github.io.
How to get started
cd to HaskellVerbalExpressions
cabal install verbalexpressions.cabal
ghc Text/Regex/VerbalExpressions/verbalexpressions.hs examples.hs
Examples
Here's a couple of simple examples to give an idea of how VerbalExpressions works:
Testing if we have a valid URL
-- Create an example of how to test for correctly formed URLs
let expr = searchGlobal >>>
startOfLine >>>
find "http" >>>
possibly "s" >>>
find "://" >>>
possibly "www" >>>
anythingBut " " >>>
endOfLine
$ verEx
-- Use VerEx's test() function to find if it matches
print $ test "http://www.google.com" expr
-- Outputs the actual expression used: ^(?:http)(?:s)?(?:://)(?:www.)?(?:[^ ]*)$
print $ expr
Replacing strings
-- Create a test string
let replaceMe = "Replace bird with a duck"
-- Create an expression that seeks for word "bird"
let expr2 = find "bird" $ verEx;
-- Execute the expression
print $ replace replaceMe "duck" expr2
Shorthand for string replace:
print $ replace "We have a red house" "blue" . find "red" $ verEx
Here you can find the API documentation for Verbal Expressions
Basic usage
Basic usage of Verbal Expressions is through a singleton, called verEx
, that creates a new expression for you:
let expr = (all of your terms) $ verEx
API
Terms
- . anything
- . anythingBut - String
- . something
- . somethingBut - String
- . endOfLine'
- . find - String
- . possibly - String
- . startOfLine
Special characters and groups
- .any - String
- .anyOf - String
- .br
- .lineBreak
- .range - [String]
- .tab
- .word
Modifiers
- .withAnyCase
- .searchOneLine
- .searchGlobal
Functions
- .replace - String(source) String(value)
- .test
Other
- .add - String
- .multiple - String
- .alt