| Copyright | (c) Dong Han 2017-2018 |
|---|---|
| License | BSD |
| Maintainer | winterland1989@gmail.com |
| Stability | experimental |
| Portability | non-portable |
| Safe Haskell | None |
| Language | Haskell2010 |
Z.Data.Text.Regex
Contents
Description
Binding to google's RE2, microsoft did a nice job on RE2 regex syntaxs:
https://docs.microsoft.com/en-us/deployedge/edge-learnmore-regex. Note GHC string literals need \ to
be escaped, e.g.
>>>match (regex "([a-z0-9_\\.-]+)@([\\da-z\\.-]+)\\.([a-z\\.]{2,6})") "please end email to hello@world.com, foo@bar.com">>>("hello@world.com",[Just "hello",Just "world",Just "com"],", foo@bar.com")
Synopsis
- data Regex
- regex :: HasCallStack => Text -> Regex
- data RegexOpts = RegexOpts {
- posix_syntax :: Bool
- longest_match :: Bool
- max_mem :: !Int64
- literal :: Bool
- never_nl :: Bool
- dot_nl :: Bool
- never_capture :: Bool
- case_sensitive :: Bool
- perl_classes :: Bool
- word_boundary :: Bool
- one_line :: Bool
- defaultRegexOpts :: RegexOpts
- regexOpts :: HasCallStack => RegexOpts -> Text -> Regex
- escape :: Text -> Text
- regexCaptureNum :: Regex -> Int
- regexPattern :: Regex -> Text
- data RegexException = InvalidRegexPattern Text CallStack
- test :: Regex -> Text -> Bool
- match :: Regex -> Text -> (Text, [Maybe Text], Text)
- replace :: Regex -> Bool -> Text -> Text -> Text
- extract :: Regex -> Text -> Text -> Text
RE2 regex
A compiled RE2 regex.
Instances
| Show Regex Source # | |
| Generic Regex Source # | |
| Print Regex Source # | |
Defined in Z.Data.Text.Regex | |
| type Rep Regex Source # | |
Defined in Z.Data.Text.Regex type Rep Regex = D1 ('MetaData "Regex" "Z.Data.Text.Regex" "Z-Data-0.9.0.0-9CZLncR3XfBEnMnIuwgUs7" 'False) (C1 ('MetaCons "Regex" 'PrefixI 'True) (S1 ('MetaSel ('Just "regexPtr") 'SourceUnpack 'SourceStrict 'DecidedStrict) (Rec0 (CPtr Regex)) :*: (S1 ('MetaSel ('Just "regexCaptureNum") 'SourceUnpack 'SourceStrict 'DecidedStrict) (Rec0 Int) :*: S1 ('MetaSel ('Just "regexPattern") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Text)))) | |
regex :: HasCallStack => Text -> Regex Source #
Compile a regex pattern, throw InvalidRegexPattern in case of illegal patterns.
RE2 Regex options.
The options are (defaultRegexOpts in parentheses):
posix_syntax (false) restrict regexps to POSIX egrep syntax
longest_match (false) search for longest match, not first match
log_errors (true) log syntax and execution errors to ERROR
max_mem (8<<20) approx. max memory footprint of RE2
literal (false) interpret string as literal, not regexp
never_nl (false) never match \n, even if it is in regexp
dot_nl (false) dot matches everything including new line
never_capture (false) parse all parens as non-capturing
case_sensitive (true) match is case-sensitive (regexp can override
with (?i) unless in posix_syntax mode)
The following options are only consulted when posix_syntax == true.
When posix_syntax == false, these features are always enabled and
cannot be turned off; to perform multi-line matching in that case,
begin the regexp with (?m).
perl_classes (false) allow Perl's \d \s \w \D \S \W word_boundary (false) allow Perl's \b \B (word boundary and not) one_line (false) ^ and $ only match beginning and end of text
Constructors
| RegexOpts | |
Fields
| |
Instances
defaultRegexOpts :: RegexOpts Source #
Default regex options, see RegexOpts.
regexOpts :: HasCallStack => RegexOpts -> Text -> Regex Source #
Compile a regex pattern withOptions, throw InvalidRegexPattern in case of illegal patterns.
escape :: Text -> Text Source #
Escape a piece of text literal so that it can be safely used in regex pattern.
>>>escape "(\\d+)">>>"\\(\\\\d\\+\\)"
regexCaptureNum :: Regex -> Int Source #
capturing group number(including \0)
regexPattern :: Regex -> Text Source #
Get back regex's pattern.
data RegexException Source #
Exception thrown when using regex.
Constructors
| InvalidRegexPattern Text CallStack |
Instances
| Show RegexException Source # | |
Defined in Z.Data.Text.Regex Methods showsPrec :: Int -> RegexException -> ShowS # show :: RegexException -> String # showList :: [RegexException] -> ShowS # | |
| Exception RegexException Source # | |
Defined in Z.Data.Text.Regex Methods toException :: RegexException -> SomeException # | |
regex operations
match :: Regex -> Text -> (Text, [Maybe Text], Text) Source #
Check if text matched regex pattern,
if so return matched part, all capturing groups(from \1) and the text after matched part.
Nothing indicate a non-matching capturing group, e.g.
>>>match (regex "(foo)|(bar)baz") "barbazbla">>>("barbaz",[Nothing,Just "bar"], "bla")
Replace matched part in input with a rewrite pattern. If no matched part found, return the original input.
>>>replace (regex "red") False "A red fox with red fur" "yellow">>>"A yellow fox with red fur">>>replace (regex "red") True "A red fox with red fur" "yellow">>>"A yellow fox with yellow fur"