regex-posix-0.96.0.1: POSIX Backend for "Text.Regex" (regex-base)
Copyright(c) Chris Kuklewicz 2006
LicenseBSD-3-Clause
Maintainerhvr@gnu.org, Andreas Abel
Stabilitystable
Portabilitynon-portable (regex-base needs MPTC+FD)
Safe HaskellNone
LanguageHaskell2010

Text.Regex.Posix.String

Description

This provides String instances for RegexMaker and RegexLike based on Text.Regex.Posix.Wrap, and a (RegexContext Regex String String) instance.

To use these instance, you would normally import Text.Regex.Posix. You only need to import this module to use the medium level API of the compile, regexec, and execute functions. All of these report error by returning Left values instead of undefined or error or fail.

Synopsis

Types

data Regex #

A compiled regular expression.

Instances

Instances details
RegexLike Regex String # 
Instance details

Defined in Text.Regex.Posix.String

RegexLike Regex ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString.Lazy

RegexLike Regex ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString

RegexOptions Regex CompOption ExecOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

RegexContext Regex String String # 
Instance details

Defined in Text.Regex.Posix.String

Methods

match :: Regex -> String -> String #

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

RegexContext Regex ByteString ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString.Lazy

RegexContext Regex ByteString ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString

RegexMaker Regex CompOption ExecOption String # 
Instance details

Defined in Text.Regex.Posix.String

RegexMaker Regex CompOption ExecOption ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString.Lazy

RegexMaker Regex CompOption ExecOption ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString

RegexMaker Regex CompOption ExecOption (Seq Char) # 
Instance details

Defined in Text.Regex.Posix.Sequence

RegexLike Regex (Seq Char) # 
Instance details

Defined in Text.Regex.Posix.Sequence

RegexContext Regex (Seq Char) (Seq Char) # 
Instance details

Defined in Text.Regex.Posix.Sequence

Methods

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

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

type MatchOffset = Int #

0 based index from start of source, or (-1) for unused

type MatchLength = Int #

non-negative length of a match

data 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

Instances

Instances details
Eq ReturnCode # 
Instance details

Defined in Text.Regex.Posix.Wrap

Show ReturnCode # 
Instance details

Defined in Text.Regex.Posix.Wrap

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.

Miscellaneous

Medium level API functions

compile #

Arguments

:: CompOption

Flags (summed together)

-> ExecOption

Flags (summed together)

-> String

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

-> IO (Either WrapError Regex)

Returns: the compiled regular expression

regexec #

Arguments

:: Regex

Compiled regular expression

-> String

String to match against

-> IO (Either WrapError (Maybe (String, String, String, [String])))

Returns: Nothing if the regex did not match the string, or:

  Just (everything before match,
        matched portion,
        everything after match,
        subexpression matches)

Matches a regular expression against a string

execute #

Arguments

:: Regex

Compiled regular expression

-> String

String to match against

-> IO (Either WrapError (Maybe (Array Int (MatchOffset, MatchLength))))

Returns: Nothing if the regex did not match the string, or:

  Just (array of offset length pairs)

Matches a regular expression against a string

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

Instances details
Eq CompOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

Num CompOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

Show CompOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

Bits CompOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

RegexOptions Regex CompOption ExecOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

RegexMaker Regex CompOption ExecOption String # 
Instance details

Defined in Text.Regex.Posix.String

RegexMaker Regex CompOption ExecOption ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString.Lazy

RegexMaker Regex CompOption ExecOption ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString

RegexMaker Regex CompOption ExecOption (Seq Char) # 
Instance details

Defined in Text.Regex.Posix.Sequence

compBlank :: CompOption #

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

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

Instances details
Eq ExecOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

Num ExecOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

Show ExecOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

Bits ExecOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

RegexOptions Regex CompOption ExecOption # 
Instance details

Defined in Text.Regex.Posix.Wrap

RegexMaker Regex CompOption ExecOption String # 
Instance details

Defined in Text.Regex.Posix.String

RegexMaker Regex CompOption ExecOption ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString.Lazy

RegexMaker Regex CompOption ExecOption ByteString # 
Instance details

Defined in Text.Regex.Posix.ByteString

RegexMaker Regex CompOption ExecOption (Seq Char) # 
Instance details

Defined in Text.Regex.Posix.Sequence

execBlank :: ExecOption #

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

Orphan instances