Module Pcre

module Pcre: sig .. end

Perl Compatibility Regular Expressions

Exceptions

type error =

`\|`	`Partial`	`(*`	String only matched the pattern partially	`*)`
`\|`	`BadPartial`	`(*`	Pattern contains items that cannot be used together with partial matching.	`*)`
`\|`	`BadPattern of string * int`	`(*`	`BadPattern (msg, pos)` regular expression is malformed. The reason is in `msg`, the position of the error in the pattern in `pos`.	`*)`
`\|`	`BadUTF8`	`(*`	UTF8 string being matched is invalid	`*)`
`\|`	`BadUTF8Offset`	`(*`	Gets raised when a UTF8 string being matched with offset is invalid.	`*)`
`\|`	`MatchLimit`	`(*`	Maximum allowed number of match attempts with backtracking or recursion is reached during matching. ALL FUNCTIONS CALLING THE MATCHING ENGINE MAY RAISE IT!!!	`*)`
`\|`	`RecursionLimit`
`\|`	`InternalError of string`	`(*`	`InternalError msg` C-library exhibits unknown/undefined behaviour. The reason is in `msg`.	`*)`

exception Error of error

Exception indicating PCRE errors.

exception Backtrack

Backtrack used in callout functions to force backtracking.

exception Regexp_or of string * error

Regexp_or (pat, error) gets raised for sub-pattern pat by regexp_or if it failed to compile.

Compilation and runtime flags and their conversion functions

type icflag

Internal representation of compilation flags

type irflag

Internal representation of runtime flags

type cflag = [ `ANCHORED
       | `AUTO_CALLOUT
       | `CASELESS
       | `DOLLAR_ENDONLY
       | `DOTALL
       | `EXTENDED
       | `EXTRA
       | `FIRSTLINE
       | `MULTILINE
       | `NO_AUTO_CAPTURE
       | `NO_UTF8_CHECK
       | `UNGREEDY
       | `UTF8 ]

Compilation flags

val cflags : cflag list -> icflag

cflags cflag_list converts a list of compilation flags to their internal representation.

val cflag_list : icflag -> cflag list

cflag_list cflags converts internal representation of compilation flags to a list.

type rflag = [ `ANCHORED | `NOTBOL | `NOTEMPTY | `NOTEOL | `PARTIAL ]

Runtime flags

val rflags : rflag list -> irflag

rflags rflag_list converts a list of runtime flags to their internal representation.

val rflag_list : irflag -> rflag list

rflag_list rflags converts internal representation of runtime flags to a list.

Information on the PCRE-configuration (build-time options)

val version : string

Version information

Version of the PCRE-C-library

val config_utf8 : bool

Indicates whether UTF8-support is enabled

val config_newline : char

Character used as newline

val config_link_size : int

Number of bytes used for internal linkage of regular expressions

val config_match_limit : int

Default limit for calls to internal matching function

val config_match_limit_recursion : int

Default limit recursion for calls to internal matching function

val config_stackrecurse : bool

Indicates use of stack recursion in matching function

Information on patterns

type firstbyte_info = [ `ANCHORED | `Char of char | `Start_only ]

Information on matching of "first chars" in patterns

type study_stat = [ `Not_studied | `Optimal | `Studied ]

Information on the study status of patterns

type regexp

Compiled regular expressions

val options : regexp -> icflag

options regexp

Returns compilation flags of regexp.

val size : regexp -> int

size regexp

Returns memory size of regexp.

val studysize : regexp -> int

studysize regexp

Returns memory size of study information of regexp.

val capturecount : regexp -> int

capturecount regexp

Returns number of capturing subpatterns in regexp.

val backrefmax : regexp -> int

backrefmax regexp

Returns number of highest backreference in regexp.

val namecount : regexp -> int

namecount regexp

Returns number of named subpatterns in regexp.

val names : regexp -> string array

names regex

Returns array of names of named substrings in regexp.

val nameentrysize : regexp -> int

nameentrysize regexp

Returns size of longest name of named subpatterns in regexp + 3.

val firstbyte : regexp -> firstbyte_info

firstbyte regexp

Returns firstbyte info on regexp.

val firsttable : regexp -> string option

firsttable regexp

Returns some 256-bit (32-byte) fixed set table in form of a string for regexp if available, None otherwise.

val lastliteral : regexp -> char option

lastliteral regexp

Returns some last matching character of regexp if available, None otherwise.

val study_stat : regexp -> study_stat

study_stat regexp

Returns study status of regexp.

val get_stringnumber : regexp -> string -> int

get_stringnumber rex name

Raises Invalid_arg if there is no such named substring.
Returns the index of the named substring name in regular expression rex. This index can then be used with get_substring.

val get_match_limit : regexp -> int option

get_match_limit rex

Returns some match limit of regular expression rex or None.

val get_match_limit_recursion : regexp -> int option

get_match_limit_recursion rex

Returns some recursion match limit of regular expression rex or None.

Compilation of patterns

type chtables

Alternative set of char tables for pattern matching

val maketables : unit -> chtables

Generates new set of char tables for the current locale.

val regexp : ?study:bool ->
       ?limit:int ->
       ?limit_recursion:int ->
       ?iflags:icflag ->
       ?flags:cflag list -> ?chtables:chtables -> string -> regexp

regexp ?study ?limit ?limit_recursion ?iflags ?flags ?chtables pattern compiles pattern with flags when given, with iflags otherwise, and with char tables chtables. If study is true, then the resulting regular expression will be studied. If limit is specified, this sets a limit to the amount of recursion and backtracking (only lower than the builtin default!). If this limit is exceeded, MatchLimit will be raised during matching.

Returns the regular expression. For detailed documentation on how you can specify PERL-style regular expressions (= patterns), please consult the PCRE-documentation ("man pcrepattern") or PERL-manuals.
See also www.perl.com

study : default = true

limit : default = no extra limit other than default

limit_recursion : default = no extra limit_recursion other than default

iflags : default = no extra flags

flags : default = ignored

chtables : default = builtin char tables

val regexp_or : ?study:bool ->
       ?limit:int ->
       ?limit_recursion:int ->
       ?iflags:icflag ->
       ?flags:cflag list ->
       ?chtables:chtables -> string list -> regexp

regexp_or ?study ?limit ?limit_recursion ?iflags ?flags ?chtables patterns like Pcre.regexp, but combines patterns as alternatives (or-patterns) into one regular expression.

val quote : string -> string

quote str

Returns the quoted string of str.

Subpattern extraction

type substrings

Information on substrings after pattern matching

val get_subject : substrings -> string

get_subject substrings

Returns the subject string of substrings.

val num_of_subs : substrings -> int

num_of_subs substrings

Returns number of strings in substrings (whole match inclusive).

val get_substring : substrings -> int -> string

get_substring substrings n

Raises
- Invalid_argument if n is not in the range of the number of substrings.
- Not_found if the corresponding subpattern did not capture a substring.
Returns the nth substring (0 is whole match) of substrings.

val get_substring_ofs : substrings -> int -> int * int

get_substring_ofs substrings n

Raises
- Invalid_argument if n is not in the range of the number of substrings.
- Not_found if the corresponding subpattern did not capture a substring.
Returns the offset tuple of the nth substring of substrings (0 is whole match).

val get_substrings : ?full_match:bool -> substrings -> string array

get_substrings ?full_match substrings

Returns the array of substrings in substrings. It includes the full match at index 0 when full_match is true, the captured substrings only when it is false. If a subpattern did not capture a substring, the empty string is returned in the corresponding position instead.

full_match : default = true

val get_opt_substrings : ?full_match:bool -> substrings -> string option array

get_opt_substrings ?full_match substrings

Returns the array of optional substrings in substrings. It includes Some full_match_str at index 0 when full_match is true, Some captured_substrings only when it is false. If a subpattern did not capture a substring, None is returned in the corresponding position instead.

full_match : default = true

val get_named_substring : regexp -> string -> substrings -> string

get_named_substring rex name substrings

Raises
- Invalid_argument if there is no such named substring.
- Not_found if the corresponding subpattern did not capture a substring.
Returns the named substring name in regular expression rex and substrings.

val get_named_substring_ofs : regexp -> string -> substrings -> int * int

get_named_substring_ofs rex name substrings

Raises
- Invalid_argument if there is no such named substring.
- Not_found if the corresponding subpattern did not capture a substring.
Returns the offset tuple of the named substring name in regular expression rex and substrings.

Callouts

type callout_data = {

`callout_number : int;`	`(*`	Callout number	`*)`
`substrings : substrings;`	`(*`	Substrings matched so far	`*)`
`start_match : int;`	`(*`	Subject start offset of current match attempt	`*)`
`current_position : int;`	`(*`	Subject offset of current match pointer	`*)`
`capture_top : int;`	`(*`	Number of the highest captured substring so far	`*)`
`capture_last : int;`	`(*`	Number of the most recently captured substring	`*)`
`pattern_position : int;`	`(*`	Offset of next match item in pattern string	`*)`
`next_item_length : int;`	`(*`	Length of next match item in pattern string	`*)`

}

type callout = callout_data -> unit

Type of callout functions

Callouts are referred to in patterns as "(?Cn)" where "n" is a callout_number ranging from 0 to 255. Substrings captured so far are accessible as usual via substrings. You will have to consider capture_top and capture_last to know about the current state of valid substrings.

By raising exception Backtrack within a callout function, the user can force the pattern matching engine to backtrack to other possible solutions. Other exceptions will terminate matching immediately and return control to OCaml.

Matching of patterns and subpattern extraction

val pcre_exec : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string -> ?pos:int -> ?callout:callout -> string -> int array

pcre_exec ?iflags ?flags ?rex ?pat ?pos ?callout subj

Raises Not_found if pattern does not match.
Returns an array of offsets that describe the position of matched subpatterns in the string subj starting at position pos with pattern pat when given, regular expression rex otherwise. The array also contains additional workspace needed by the match engine. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

callout : default = ignore callouts

val exec : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string -> ?pos:int -> ?callout:callout -> string -> substrings

exec ?iflags ?flags ?rex ?pat ?pos ?callout subj

Raises Not_found if pattern does not match.
Returns substring information on string subj starting at position pos with pattern pat when given, regular expression rex otherwise. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

callout : default = ignore callouts

val exec_all : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int -> ?callout:callout -> string -> substrings array

exec_all ?iflags ?flags ?rex ?pat ?pos ?callout subj

Raises Not_found if pattern does not match.
Returns an array of substring information of all matching substrings in string subj starting at position pos with pattern pat when given, regular expression rex otherwise. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

callout : default = ignore callouts

val next_match : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int -> ?callout:callout -> substrings -> substrings

next_match ?iflags ?flags ?rex ?pat ?pos ?callout substrs

Raises
- Not_found if pattern does not match.
- Invalid_arg if pos let matching start outside of the subject string.
Returns substring information on the match that follows on the last match denoted by substrs, jumping over pos characters (also backwards!), using pattern pat when given, regular expression rex otherwise. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

callout : default = ignore callouts

val extract : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?full_match:bool -> ?callout:callout -> string -> string array

extract ?iflags ?flags ?rex ?pat ?pos ?full_match ?callout subj

Raises Not_found if pattern does not match.
Returns the array of substrings that match subj starting at position pos, using pattern pat when given, regular expression rex otherwise. Uses flags when given, the precompiled iflags otherwise. It includes the full match at index 0 when full_match is true, the captured substrings only when it is false. Callouts are handled by callout. If a subpattern did not capture a substring, the empty string is returned in the corresponding position instead.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

full_match : default = true

callout : default = ignore callouts

val extract_opt : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?full_match:bool -> ?callout:callout -> string -> string option array

extract_opt ?iflags ?flags ?rex ?pat ?pos ?full_match ?callout subj

Raises Not_found if pattern does not match.
Returns the array of optional substrings that match subj starting at position pos, using pattern pat when given, regular expression rex otherwise. Uses flags when given, the precompiled iflags otherwise. It includes Some full_match_str at index 0 when full_match is true, Some captured-substrings only when it is false. Callouts are handled by callout. If a subpattern did not capture a substring, None is returned in the corresponding position instead.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

full_match : default = true

callout : default = ignore callouts

val extract_all : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?full_match:bool -> ?callout:callout -> string -> string array array

extract_all ?iflags ?flags ?rex ?pat ?pos ?full_match ?callout subj

Raises Not_found if pattern does not match.
Returns an array of arrays of all matching substrings that match subj starting at position pos, using pattern pat when given, regular expression rex otherwise. Uses flags when given, the precompiled iflags otherwise. It includes the full match at index 0 of the extracted string arrays when full_match is true, the captured substrings only when it is false. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

full_match : default = true

callout : default = ignore callouts

val extract_all_opt : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?full_match:bool ->
       ?callout:callout -> string -> string option array array

extract_all_opt ?iflags ?flags ?rex ?pat ?pos ?full_match ?callout subj

Raises Not_found if pattern does not match.
Returns an array of arrays of all optional matching substrings that match subj starting at position pos, using pattern pat when given, regular expression rex otherwise. Uses flags when given, the precompiled iflags otherwise. It includes Some full_match_str at index 0 of the extracted string arrays when full_match is true, Some captured_substrings only when it is false. Callouts are handled by callout. If a subpattern did not capture a substring, None is returned in the corresponding position instead.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

full_match : default = true

callout : default = ignore callouts

val pmatch : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string -> ?pos:int -> ?callout:callout -> string -> bool

pmatch ?iflags ?flags ?rex ?pat ?pos ?callout subj

Returns true if subj is matched by pattern pat when given, regular expression rex otherwise, starting at position pos. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

callout : default = ignore callouts

String substitution

type substitution

Information on substitution patterns

val subst : string -> substitution

subst str converts the string str representing a substitution pattern to the internal representation

The contents of the substitution string str can be normal text mixed with any of the following (mostly as in PERL):

$[0-9]+ - a "$" immediately followed by an arbitrary number. "$0" stands for the name of the executable, any other number for the n-th backreference.
$& - the whole matched pattern
$` - the text before the match
$' - the text after the match
$+ - the last group that matched
$$ - a single "$"
$! - delimiter which does not appear in the substitution. Can be used to part "$0-9+" from an immediately following other number.

val replace : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?itempl:substitution ->
       ?templ:string -> ?callout:callout -> string -> string

replace ?iflags ?flags ?rex ?pat ?pos ?itempl ?templ ?callout subj replaces all substrings of subj matching pattern pat when given, regular expression rex otherwise, starting at position pos with the substitution string templ when given, itempl otherwise. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

Raises Failure if there are backreferences to nonexistent subpatterns.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

itempl : default = empty string

templ : default = ignored

callout : default = ignore callouts

val qreplace : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int -> ?templ:string -> ?callout:callout -> string -> string

qreplace ?iflags ?flags ?rex ?pat ?pos ?templ ?callout subj replaces all substrings of subj matching pattern pat when given, regular expression rex otherwise, starting at position pos with the string templ. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

templ : default = ignored

callout : default = ignore callouts

val substitute_substrings : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?callout:callout ->
       subst:(substrings -> string) -> string -> string

substitute_substrings ?iflags ?flags ?rex ?pat ?pos ?callout ~subst subj replaces all substrings of subj matching pattern pat when given, regular expression rex otherwise, starting at position pos with the result of function subst applied to the substrings of the match. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

callout : default = ignore callouts

val substitute : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?callout:callout -> subst:(string -> string) -> string -> string

substitute ?iflags ?flags ?rex ?pat ?pos ?callout ~subst subj replaces all substrings of subj matching pattern pat when given, regular expression rex otherwise, starting at position pos with the result of function subst applied to the match. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

callout : default = ignore callouts

val replace_first : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?itempl:substitution ->
       ?templ:string -> ?callout:callout -> string -> string

replace_first ?iflags ?flags ?rex ?pat ?pos ?itempl ?templ ?callout subj replaces the first substring of subj matching pattern pat when given, regular expression rex otherwise, starting at position pos with the substitution string templ when given, itempl otherwise. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

Raises Failure if there are backreferences to nonexistent subpatterns.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

itempl : default = empty string

templ : default = ignored

callout : default = ignore callouts

val qreplace_first : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int -> ?templ:string -> ?callout:callout -> string -> string

qreplace_first ?iflags ?flags ?rex ?pat ?pos ?templ ?callout subj replaces the first substring of subj matching pattern pat when given, regular expression rex otherwise, starting at position pos with the string templ. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

templ : default = ignored

callout : default = ignore callouts

val substitute_substrings_first : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?callout:callout ->
       subst:(substrings -> string) -> string -> string

substitute_substrings_first ?iflags ?flags ?rex ?pat ?pos ?callout ~subst subj replaces the first substring of subj matching pattern pat when given, regular expression rex otherwise, starting at position pos with the result of function subst applied to the substrings of the match. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

callout : default = ignore callouts

val substitute_first : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?callout:callout -> subst:(string -> string) -> string -> string

substitute_first ?iflags ?flags ?rex ?pat ?pos ?callout ~subst subj replaces the first substring of subj matching pattern pat when given, regular expression rex otherwise, starting at position pos with the result of function subst applied to the match. Uses flags when given, the precompiled iflags otherwise. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

callout : default = ignore callouts

Splitting

val split : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int -> ?max:int -> ?callout:callout -> string -> string list

split ?iflags ?flags ?rex ?pat ?pos ?max ?callout subj splits subj into a list of at most max strings, using as delimiter pattern pat when given, regular expression rex otherwise, starting at position pos. Uses flags when given, the precompiled iflags otherwise. If max is zero, trailing empty fields are stripped. If it is negative, it is treated as arbitrarily large. If neither pat nor rex are specified, leading whitespace will be stripped! Should behave exactly as in PERL. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

max : default = 0

callout : default = ignore callouts

val asplit : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int -> ?max:int -> ?callout:callout -> string -> string array

asplit ?iflags ?flags ?rex ?pat ?pos ?max ?callout subj same as Pcre.split but

Returns an array instead of a list.

type split_result =

`\|`	`Text of string`	`(*`	Text part of split string	`*)`
`\|`	`Delim of string`	`(*`	Delimiter part of split string	`*)`
`\|`	`Group of int * string`	`(*`	Subgroup of matched delimiter (subgroup_nr, subgroup_str)	`*)`
`\|`	`NoGroup`	`(*`	Unmatched subgroup	`*)`

Result of a Pcre.full_split

val full_split : ?iflags:irflag ->
       ?flags:rflag list ->
       ?rex:regexp ->
       ?pat:string ->
       ?pos:int ->
       ?max:int -> ?callout:callout -> string -> split_result list

full_split ?iflags ?flags ?rex ?pat ?pos ?max ?callout subj splits subj into a list of at most max elements of type "split_result", using as delimiter pattern pat when given, regular expression rex otherwise, starting at position pos. Uses flags when given, the precompiled iflags otherwise. If max is zero, trailing empty fields are stripped. If it is negative, it is treated as arbitrarily large. Should behave exactly as in PERL. Callouts are handled by callout.

iflags : default = no extra flags

flags : default = ignored

rex : default = matches whitespace

pat : default = ignored

pos : default = 0

max : default = 0

callout : default = ignore callouts

Additional convenience functions

val foreach_line : ?ic:Stdlib.in_channel -> (string -> unit) -> unit

foreach_line ?ic f applies f to each line in inchannel ic until the end-of-file is reached.

ic : default = stdin

val foreach_file : string list -> (string -> Stdlib.in_channel -> unit) -> unit

foreach_file filenames f opens each file in the list filenames for input and applies f to each filename and the corresponding channel. Channels are closed after each operation (even when exceptions occur - they get reraised afterwards!).

UNSAFE STUFF - USE WITH CAUTION!

val unsafe_pcre_exec : irflag ->
       regexp ->
       pos:int ->
       subj_start:int -> subj:string -> int array -> callout option -> unit

unsafe_pcre_exec flags rex ~pos ~subj_start ~subj offset_vector. You should read the C-source to know what happens. If you do not understand it - don't use this function!

val make_ovector : regexp -> int * int array

make_ovector regexp calculates the tuple (subgroups2, ovector) which is the number of subgroup offsets and the offset array.