Text.Regex.Posix.Wrap

WrapPosix.hsc exports a wrapped version of the ffi imports. To increase type safety, the flags are newtype'd. The other important export is a Regex type that is specific to the Posix library backend. The flags are documented in Text.Regex.Posix. The defaultCompOpt is (compExtended .|. compNewline).

The Regex, CompOption, and ExecOption types and their RegexOptions instance is declared. The =~ and =~~ convenience functions are defined.

This module will fail or error only if allocation fails or a nullPtr is passed in.

2009-January : wrapMatchAll and wrapCount now adjust the execution option execNotBOL after the first result to take into account 'n' in the text immediately before the next matches. (version 0.93.3)

2009-January : wrapMatchAll and wrapCount have been changed to return all non-overlapping matches, including empty matches even if they coincide with the end of the previous non-empty match. The change is that the first non-empty match no longer terminates the search. One can filter the results to obtain the old behavior or to obtain the behavior of "sed", where "sed" eliminates the empty matches which coincide with the end of non-empty matches. (version 0.94.0)

High-level API

data Regex

A compiled regular expression.

Instances

RegexLike Regex String

Defined in Text.Regex.Posix.String

Methods

matchOnce :: Regex -> String -> Maybe MatchArray

matchAll :: Regex -> String -> [MatchArray]

matchCount :: Regex -> String -> Int

matchTest :: Regex -> String -> Bool

matchAllText :: Regex -> String -> [MatchText String]

matchOnceText :: Regex -> String -> Maybe (String, MatchText String, String)

RegexLike Regex ByteString

Defined in Text.Regex.Posix.ByteString.Lazy

Methods

matchOnce :: Regex -> ByteString -> Maybe MatchArray

matchAll :: Regex -> ByteString -> [MatchArray]

matchCount :: Regex -> ByteString -> Int

matchTest :: Regex -> ByteString -> Bool

matchAllText :: Regex -> ByteString -> [MatchText ByteString]

matchOnceText :: Regex -> ByteString -> Maybe (ByteString, MatchText ByteString, ByteString)

RegexLike Regex ByteString

Defined in Text.Regex.Posix.ByteString

Methods

matchOnce :: Regex -> ByteString -> Maybe MatchArray

matchAll :: Regex -> ByteString -> [MatchArray]

matchCount :: Regex -> ByteString -> Int

matchTest :: Regex -> ByteString -> Bool

matchAllText :: Regex -> ByteString -> [MatchText ByteString]

matchOnceText :: Regex -> ByteString -> Maybe (ByteString, MatchText ByteString, ByteString)

RegexContext Regex String String

Defined in Text.Regex.Posix.String

Methods

match :: Regex -> String -> String

matchM :: MonadFail m => Regex -> String -> m String

RegexContext Regex ByteString ByteString

Defined in Text.Regex.Posix.ByteString.Lazy

Methods

match :: Regex -> ByteString -> ByteString

matchM :: MonadFail m => Regex -> ByteString -> m ByteString

RegexContext Regex ByteString ByteString

Defined in Text.Regex.Posix.ByteString

Methods

match :: Regex -> ByteString -> ByteString

matchM :: MonadFail m => Regex -> ByteString -> m ByteString

RegexOptions Regex CompOption ExecOption

Defined in Text.Regex.Posix.Wrap

Methods

blankCompOpt :: CompOption

blankExecOpt :: ExecOption

defaultCompOpt :: CompOption

defaultExecOpt :: ExecOption

setExecOpts :: ExecOption -> Regex -> Regex

getExecOpts :: Regex -> ExecOption

RegexMaker Regex CompOption ExecOption String

Defined in Text.Regex.Posix.String

Methods

makeRegex :: String -> Regex

makeRegexOpts :: CompOption -> ExecOption -> String -> Regex

makeRegexM :: MonadFail m => String -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> String -> m Regex

RegexMaker Regex CompOption ExecOption ByteString

Defined in Text.Regex.Posix.ByteString.Lazy

Methods

makeRegex :: ByteString -> Regex

makeRegexOpts :: CompOption -> ExecOption -> ByteString -> Regex

makeRegexM :: MonadFail m => ByteString -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> ByteString -> m Regex

RegexMaker Regex CompOption ExecOption ByteString

Defined in Text.Regex.Posix.ByteString

Methods

makeRegex :: ByteString -> Regex

makeRegexOpts :: CompOption -> ExecOption -> ByteString -> Regex

makeRegexM :: MonadFail m => ByteString -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> ByteString -> m Regex

RegexMaker Regex CompOption ExecOption (Seq Char)

Defined in Text.Regex.Posix.Sequence

Methods

makeRegex :: Seq Char -> Regex

makeRegexOpts :: CompOption -> ExecOption -> Seq Char -> Regex

makeRegexM :: MonadFail m => Seq Char -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> Seq Char -> m Regex

RegexLike Regex (Seq Char)

Defined in Text.Regex.Posix.Sequence

Methods

matchOnce :: Regex -> Seq Char -> Maybe MatchArray

matchAll :: Regex -> Seq Char -> [MatchArray]

matchCount :: Regex -> Seq Char -> Int

matchTest :: Regex -> Seq Char -> Bool

matchAllText :: Regex -> Seq Char -> [MatchText (Seq Char)]

matchOnceText :: Regex -> Seq Char -> Maybe (Seq Char, MatchText (Seq Char), Seq Char)

RegexContext Regex (Seq Char) (Seq Char)

Defined in Text.Regex.Posix.Sequence

Methods

match :: Regex -> Seq Char -> Seq Char

matchM :: MonadFail m => Regex -> Seq Char -> m (Seq Char)

type RegOffset = Int64

RegOffset is typedef int regoff_t on Linux and ultimately typedef long long __int64_t on Max OS X. So rather than saying 2,147,483,647 is all the length you need, I'll take the larger: 9,223,372,036,854,775,807 should be enough bytes for anyone, no need for Integer. The alternative is to compile to different sizes in a platform dependent manner with type RegOffset = (#type regoff_t), which I do not want to do.

There is also a special value unusedRegOffset :: RegOffset which is (-1) and as a starting index means that the subgroup capture was unused. Otherwise the RegOffset indicates a character boundary that is before the character at that index offset, with the first character at index offset 0. So starting at 1 and ending at 2 means to take only the second character.

type RegOffsetT = Int64

(=~) :: (RegexMaker Regex CompOption ExecOption source, RegexContext Regex source1 target) => source1 -> source -> target

(=~~) :: (RegexMaker Regex CompOption ExecOption source, RegexContext Regex source1 target, MonadFail m) => source1 -> source -> m target

Low-level API

type WrapError = (ReturnCode, String)

The return code will be retOk when it is the Haskell wrapper and not the underlying library generating the error message.

wrapCompile

Arguments

:: CompOption

Flags (bitmapped)

-> ExecOption

Flags (bitmapped)

-> CString

The regular expression to compile (ASCII only, no null bytes)

-> IO (Either WrapError Regex)

Returns: the compiled regular expression

wrapTest :: Regex -> CString -> IO (Either WrapError Bool)

wrapMatch :: Regex -> CString -> IO (Either WrapError (Maybe [(RegOffset, RegOffset)]))

wrapMatch returns offsets for the begin and end of each capture. Unused captures have offsets of unusedRegOffset which is (-1).

wrapMatchAll :: Regex -> CString -> IO (Either WrapError [MatchArray])

wrapMatchAll returns the offset and length of each capture. Unused captures have an offset of unusedRegOffset which is (-1) and length of 0.

wrapCount :: Regex -> CString -> IO (Either WrapError Int)

Miscellaneous

unusedRegOffset :: RegOffset

Compilation options

newtype CompOption

A bitmapped CInt containing options for compilation of regular expressions. Option values (and their man 3 regcomp names) are

• compBlank which is a completely zero value for all the flags. This is also the blankCompOpt value.
• compExtended (REG_EXTENDED) which can be set to use extended instead of basic regular expressions. This is set in the defaultCompOpt value.
• compNewline (REG_NEWLINE) turns on newline sensitivity: The dot (.) and inverted set [^ ] never match newline, and ^ and $ anchors do match after and before newlines. This is set in the defaultCompOpt value.
• compIgnoreCase (REG_ICASE) which can be set to match ignoring upper and lower distinctions.
• compNoSub (REG_NOSUB) which turns off all information from matching except whether a match exists.

Constructors

CompOption CInt

Instances

Eq CompOption

Defined in Text.Regex.Posix.Wrap

Methods

(==) :: CompOption -> CompOption -> Bool

(/=) :: CompOption -> CompOption -> Bool

Num CompOption

Defined in Text.Regex.Posix.Wrap

Methods

(+) :: CompOption -> CompOption -> CompOption

(-) :: CompOption -> CompOption -> CompOption

(*) :: CompOption -> CompOption -> CompOption

negate :: CompOption -> CompOption

abs :: CompOption -> CompOption

signum :: CompOption -> CompOption

fromInteger :: Integer -> CompOption

Show CompOption

Defined in Text.Regex.Posix.Wrap

Methods

showsPrec :: Int -> CompOption -> ShowS

show :: CompOption -> String

showList :: [CompOption] -> ShowS

Bits CompOption

Defined in Text.Regex.Posix.Wrap

Methods

(.&.) :: CompOption -> CompOption -> CompOption

(.|.) :: CompOption -> CompOption -> CompOption

xor :: CompOption -> CompOption -> CompOption

complement :: CompOption -> CompOption

shift :: CompOption -> Int -> CompOption

rotate :: CompOption -> Int -> CompOption

zeroBits :: CompOption

bit :: Int -> CompOption

setBit :: CompOption -> Int -> CompOption

clearBit :: CompOption -> Int -> CompOption

complementBit :: CompOption -> Int -> CompOption

testBit :: CompOption -> Int -> Bool

bitSizeMaybe :: CompOption -> Maybe Int

bitSize :: CompOption -> Int

isSigned :: CompOption -> Bool

shiftL :: CompOption -> Int -> CompOption

unsafeShiftL :: CompOption -> Int -> CompOption

shiftR :: CompOption -> Int -> CompOption

unsafeShiftR :: CompOption -> Int -> CompOption

rotateL :: CompOption -> Int -> CompOption

rotateR :: CompOption -> Int -> CompOption

popCount :: CompOption -> Int

RegexOptions Regex CompOption ExecOption

Defined in Text.Regex.Posix.Wrap

Methods

blankCompOpt :: CompOption

blankExecOpt :: ExecOption

defaultCompOpt :: CompOption

defaultExecOpt :: ExecOption

setExecOpts :: ExecOption -> Regex -> Regex

getExecOpts :: Regex -> ExecOption

RegexMaker Regex CompOption ExecOption String

Defined in Text.Regex.Posix.String

Methods

makeRegex :: String -> Regex

makeRegexOpts :: CompOption -> ExecOption -> String -> Regex

makeRegexM :: MonadFail m => String -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> String -> m Regex

RegexMaker Regex CompOption ExecOption ByteString

Defined in Text.Regex.Posix.ByteString.Lazy

Methods

makeRegex :: ByteString -> Regex

makeRegexOpts :: CompOption -> ExecOption -> ByteString -> Regex

makeRegexM :: MonadFail m => ByteString -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> ByteString -> m Regex

RegexMaker Regex CompOption ExecOption ByteString

Defined in Text.Regex.Posix.ByteString

Methods

makeRegex :: ByteString -> Regex

makeRegexOpts :: CompOption -> ExecOption -> ByteString -> Regex

makeRegexM :: MonadFail m => ByteString -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> ByteString -> m Regex

RegexMaker Regex CompOption ExecOption (Seq Char)

Defined in Text.Regex.Posix.Sequence

Methods

makeRegex :: Seq Char -> Regex

makeRegexOpts :: CompOption -> ExecOption -> Seq Char -> Regex

makeRegexM :: MonadFail m => Seq Char -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> Seq Char -> m Regex

compBlank :: CompOption

A completely zero value for all the flags. This is also the blankCompOpt value.

compExtended :: CompOption

compIgnoreCase :: CompOption

compNoSub :: CompOption

compNewline :: CompOption

Execution options

newtype ExecOption

A bitmapped CInt containing options for execution of compiled regular expressions. Option values (and their man 3 regexec names) are

• execBlank which is a complete zero value for all the flags. This is the blankExecOpt value.
• execNotBOL (REG_NOTBOL) can be set to prevent ^ from matching at the start of the input.
• execNotEOL (REG_NOTEOL) can be set to prevent $ from matching at the end of the input (before the terminating NUL).

Constructors

ExecOption CInt

Instances

Eq ExecOption

Defined in Text.Regex.Posix.Wrap

Methods

(==) :: ExecOption -> ExecOption -> Bool

(/=) :: ExecOption -> ExecOption -> Bool

Num ExecOption

Defined in Text.Regex.Posix.Wrap

Methods

(+) :: ExecOption -> ExecOption -> ExecOption

(-) :: ExecOption -> ExecOption -> ExecOption

(*) :: ExecOption -> ExecOption -> ExecOption

negate :: ExecOption -> ExecOption

abs :: ExecOption -> ExecOption

signum :: ExecOption -> ExecOption

fromInteger :: Integer -> ExecOption

Show ExecOption

Defined in Text.Regex.Posix.Wrap

Methods

showsPrec :: Int -> ExecOption -> ShowS

show :: ExecOption -> String

showList :: [ExecOption] -> ShowS

Bits ExecOption

Defined in Text.Regex.Posix.Wrap

Methods

(.&.) :: ExecOption -> ExecOption -> ExecOption

(.|.) :: ExecOption -> ExecOption -> ExecOption

xor :: ExecOption -> ExecOption -> ExecOption

complement :: ExecOption -> ExecOption

shift :: ExecOption -> Int -> ExecOption

rotate :: ExecOption -> Int -> ExecOption

zeroBits :: ExecOption

bit :: Int -> ExecOption

setBit :: ExecOption -> Int -> ExecOption

clearBit :: ExecOption -> Int -> ExecOption

complementBit :: ExecOption -> Int -> ExecOption

testBit :: ExecOption -> Int -> Bool

bitSizeMaybe :: ExecOption -> Maybe Int

bitSize :: ExecOption -> Int

isSigned :: ExecOption -> Bool

shiftL :: ExecOption -> Int -> ExecOption

unsafeShiftL :: ExecOption -> Int -> ExecOption

shiftR :: ExecOption -> Int -> ExecOption

unsafeShiftR :: ExecOption -> Int -> ExecOption

rotateL :: ExecOption -> Int -> ExecOption

rotateR :: ExecOption -> Int -> ExecOption

popCount :: ExecOption -> Int

RegexOptions Regex CompOption ExecOption

Defined in Text.Regex.Posix.Wrap

Methods

blankCompOpt :: CompOption

blankExecOpt :: ExecOption

defaultCompOpt :: CompOption

defaultExecOpt :: ExecOption

setExecOpts :: ExecOption -> Regex -> Regex

getExecOpts :: Regex -> ExecOption

RegexMaker Regex CompOption ExecOption String

Defined in Text.Regex.Posix.String

Methods

makeRegex :: String -> Regex

makeRegexOpts :: CompOption -> ExecOption -> String -> Regex

makeRegexM :: MonadFail m => String -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> String -> m Regex

RegexMaker Regex CompOption ExecOption ByteString

Defined in Text.Regex.Posix.ByteString.Lazy

Methods

makeRegex :: ByteString -> Regex

makeRegexOpts :: CompOption -> ExecOption -> ByteString -> Regex

makeRegexM :: MonadFail m => ByteString -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> ByteString -> m Regex

RegexMaker Regex CompOption ExecOption ByteString

Defined in Text.Regex.Posix.ByteString

Methods

makeRegex :: ByteString -> Regex

makeRegexOpts :: CompOption -> ExecOption -> ByteString -> Regex

makeRegexM :: MonadFail m => ByteString -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> ByteString -> m Regex

RegexMaker Regex CompOption ExecOption (Seq Char)

Defined in Text.Regex.Posix.Sequence

Methods

makeRegex :: Seq Char -> Regex

makeRegexOpts :: CompOption -> ExecOption -> Seq Char -> Regex

makeRegexM :: MonadFail m => Seq Char -> m Regex

makeRegexOptsM :: MonadFail m => CompOption -> ExecOption -> Seq Char -> m Regex

execBlank :: ExecOption

A completely zero value for all the flags. This is also the blankExecOpt value.

execNotBOL :: ExecOption

execNotEOL :: ExecOption

Return codes

newtype ReturnCode

ReturnCode is an enumerated CInt, corresponding to the error codes from man 3 regex:

• retBadbr (REG_BADBR) invalid repetition count(s) in { }
• retBadpat (REG_BADPAT) invalid regular expression
• retBadrpt (REG_BADRPT) ?, *, or + operand invalid
• retEcollate (REG_ECOLLATE) invalid collating element
• retEctype (REG_ECTYPE) invalid character class
• retEescape (REG_EESCAPE) \ applied to unescapable character
• retEsubreg (REG_ESUBREG) invalid backreference number
• retEbrack (REG_EBRACK) brackets [ ] not balanced
• retEparen (REG_EPAREN) parentheses ( ) not balanced
• retEbrace (REG_EBRACE) braces { } not balanced
• retErange (REG_ERANGE) invalid character range in [ ]
• retEspace (REG_ESPACE) ran out of memory
• retNoMatch (REG_NOMATCH) The regexec() function failed to match

Constructors

ReturnCode CInt

Instances

Eq ReturnCode

Defined in Text.Regex.Posix.Wrap

Methods

(==) :: ReturnCode -> ReturnCode -> Bool

(/=) :: ReturnCode -> ReturnCode -> Bool

Show ReturnCode

Defined in Text.Regex.Posix.Wrap

Methods

showsPrec :: Int -> ReturnCode -> ShowS

show :: ReturnCode -> String

showList :: [ReturnCode] -> ShowS

retBadbr :: ReturnCode

retBadpat :: ReturnCode

retBadrpt :: ReturnCode

retEcollate :: ReturnCode

retEctype :: ReturnCode

retEescape :: ReturnCode

retEsubreg :: ReturnCode

retEbrack :: ReturnCode

retEparen :: ReturnCode

retEbrace :: ReturnCode

retErange :: ReturnCode

retEspace :: ReturnCode