Module Netstring_pcre

module Netstring_pcre: sig .. end

Wrapper for regexps with PCRE syntax

This module is a version of Str with a thread-safe interface, implemented using Pcre.

This modules processes PCRE-style regular expressions. If you like to write Str-like regexps, you can also use Netstring_str with almost the same signature.

The functions in this module are unavailable if Ocamlnet is built with Str as implementation of regular expressions! They will always raise Invalid_argument!

Supported regexp syntax: See pcrepattern(3).

type regexp

The type of regular expressions; now based on Pcre

type split_result =

`\|`	`Text of string`
`\|`	`Delim of string`
`\|`	`Group of int * string`
`\|`	`NoGroup`

Here we keep compatiblity with Pcre

type result

val regexp : string -> regexp

The type of matching results

val regexp_case_fold : string -> regexp

Parses a regexp

val quote : string -> string

Parses a case-insensitive regexp

val regexp_string : string -> regexp

Quotes a string such that it can be included in a regexp

val regexp_string_case_fold : string -> regexp

Returns a regexp that matches exactly the string

val string_match : regexp -> string -> int -> result option

Returns a case-insensitive regexp that matches exactly the string

val search_forward : regexp -> string -> int -> int * result

Matches the string at the position with the regexp. Returns None if no match is found. Returns Some r on success, and r describes the match.

val search_backward : regexp -> string -> int -> int * result

Searches a match of the string with the regexp, starting at the position and in forward direction. Raises Not_found if no match could be found. Returns (p,r) when a match at position p is found, described by r.

val matched_string : result -> string -> string

Searches a match of the string with the regexp, starting at the position and in backward direction. Raises Not_found if no match could be found. Returns (p,r) when a match at position p is found, described by r.

val match_beginning : result -> int

Extracts the matched part from the string. The string argument must be the same string passed to string_match or the search functions, and the result argument must be the corresponding result.

val match_end : result -> int

Returns the position where the matched part begins

val matched_group : result -> int -> string -> string

Returns the position where the matched part ends

val group_beginning : result -> int -> int

Extracts the substring the nth group matches from the whole string. The string argument must be the same string passed to string_match or the search functions, and the result argument must be the corresponding result.

val group_end : result -> int -> int

Returns the position where the substring matching the nth group begins

val global_replace : regexp -> string -> string -> string

Returns the position where the substring matching the nth group ends

val replace_first : regexp -> string -> string -> string

global_replace re templ s: Replaces all matchings of re in s by templ.

In templ one can refer to matched groups by the backslash notation: \1 refers to the first group, \2 to the second etc. \0 is the whole match. \\ is the backslash character.

val global_substitute : regexp ->
       (result -> string -> string) -> string -> string

replace_first re templ s: Replaces the first match of re in s by templ.

In templ one can refer to matched groups by the backslash notation: \1 refers to the first group, \2 to the second etc. \0 is the whole match. \\ is the backslash character.

val substitute_first : regexp ->
       (result -> string -> string) -> string -> string

global_substitute re subst s: Applies the substitution function subst to all matchings of re in s, and returns the transformed string. subst is called with the current result of the match and the whole string s.

val split : regexp -> string -> string list

substitute_first re subst s: Applies the substitution function subst to the first matching of re in s, and returns the transformed string. subst is called with the current result of the match and the whole string s.

val bounded_split : regexp -> string -> int -> string list

Splits the string according to the regexp in substrings. Occurrences of the delimiter at the beginning and the end are ignored.

val split_delim : regexp -> string -> string list

Splits into at most n substrings, based on split

val bounded_split_delim : regexp -> string -> int -> string list

Same as split, but occurrences of the delimiter at the beginning and the end are returned as empty strings

val full_split : regexp -> string -> split_result list

Splits into at most n substrings, based on split_delim

val bounded_full_split : regexp -> string -> int -> split_result list

Like split_delim, but returns the delimiters in the result

val string_before : string -> int -> string

Splits into at most n substrings, based on full_split

val string_after : string -> int -> string

The first n characters of a string

val first_chars : string -> int -> string

The last n characters of a string

val last_chars : string -> int -> string

Same as string_before

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