Module `Pcre`Source

Perl Compatibility Regular Expressions for OCaml

7.4.6 - homepage

Exceptions

Sourcetype 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
| WorkspaceSize
(*
Raised by pcre_dfa_exec when the provided workspace array is too small. See documention on pcre_dfa_exec for details on workspace array sizing.
*)
| InternalError of string
(*
InternalError msg C-library exhibits unknown/undefined behaviour. The reason is in msg.
*)

Sourceexception Error of error

Exception indicating PCRE errors.

Sourceexception Backtrack

Backtrack used in callout functions to force backtracking.

Sourceexception 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

Sourcetype icflag

Internal representation of compilation flags

Sourceand irflag

Internal representation of runtime flags

Sourceand cflag = [

| `CASELESS
(*
Case insensitive matching
*)
| `MULTILINE
(*
'^' and '$' match before/after newlines, not just at the beginning/end of a string
*)
| `DOTALL
(*
'.' matches all characters (newlines, too)
*)
| `EXTENDED
(*
Ignores whitespace and PERL-comments. Behaves like the '/x'-option in PERL
*)
| `ANCHORED
(*
Pattern matches only at start of string
*)
| `DOLLAR_ENDONLY
(*
'$' in pattern matches only at end of string
*)
| `EXTRA
(*
Reserved for future extensions of PCRE
*)
| `UNGREEDY
(*
Quantifiers not greedy anymore, only if followed by '?'
*)
| `UTF8
(*
Treats patterns and strings as UTF8 characters.
*)
| `NO_UTF8_CHECK
(*
Turns off validity checks on UTF8 strings for efficiency reasons. WARNING: invalid UTF8 strings may cause a crash then!
*)
| `NO_AUTO_CAPTURE
(*
Disables the use of numbered capturing parentheses
*)
| `AUTO_CALLOUT
(*
Automatically inserts callouts with id 255 before each pattern item
*)
| `FIRSTLINE
(*
Unanchored patterns must match before/at first NL
*)

]

Compilation flags

Sourceval cflags : cflag list -> icflag

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

Sourceval cflag_list : icflag -> cflag list

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

Sourcetype rflag = [

| `ANCHORED
(*
Treats pattern as if it were anchored
*)
| `NOTBOL
(*
Beginning of string is not treated as beginning of line
*)
| `NOTEOL
(*
End of string is not treated as end of line
*)
| `NOTEMPTY
(*
Empty strings are not considered to be a valid match
*)
| `PARTIAL
(*
Turns on partial matching
*)
| `DFA_RESTART
(*
Causes matching to proceed presuming the subject string is further to one partially matched previously using the same int-array working set. May only be used with pcre_dfa_exec or unsafe_pcre_dfa_exec, and should always be paired with `PARTIAL.
*)

]

Runtime flags

Sourceval rflags : rflag list -> irflag

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

Sourceval 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)

Sourceval version : string

Version information

Version of the PCRE-C-library

Sourceval config_utf8 : bool

Indicates whether UTF8-support is enabled

Sourceval config_newline : char

Character used as newline

Sourceval config_link_size : int

Number of bytes used for internal linkage of regular expressions

Sourceval config_match_limit : int

Default limit for calls to internal matching function

Sourceval config_match_limit_recursion : int

Default limit recursion for calls to internal matching function

Sourceval config_stackrecurse : bool

Indicates use of stack recursion in matching function

Information on patterns

Sourcetype firstbyte_info = [

| `Char of char
(*
Fixed first character
*)
| `Start_only
(*
Pattern matches at beginning and end of newlines
*)
| `ANCHORED
(*
Pattern is anchored
*)

]

Information on matching of "first chars" in patterns

Sourcetype study_stat = [

| `Not_studied
(*
Pattern has not yet been studied
*)
| `Studied
(*
Pattern has been studied successfully
*)
| `Optimal
(*
Pattern could not be improved by studying
*)

]

Information on the study status of patterns

Sourcetype regexp

Compiled regular expressions

Sourceval options : regexp -> icflag

options regexp

returns
compilation flags of regexp.

Sourceval size : regexp -> int

size regexp

returns
memory size of regexp.

Sourceval studysize : regexp -> int

studysize regexp

returns
memory size of study information of regexp.

Sourceval capturecount : regexp -> int

capturecount regexp

returns
number of capturing subpatterns in regexp.

Sourceval backrefmax : regexp -> int

backrefmax regexp

returns
number of highest backreference in regexp.

Sourceval namecount : regexp -> int

namecount regexp

returns
number of named subpatterns in regexp.

Sourceval nameentrysize : regexp -> int

nameentrysize regexp

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

Sourceval names : regexp -> string array

names regex

returns
array of names of named substrings in regexp.

Sourceval firstbyte : regexp -> firstbyte_info

firstbyte regexp

returns
firstbyte info on regexp.

Sourceval 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.

Sourceval lastliteral : regexp -> char option

lastliteral regexp

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

Sourceval study_stat : regexp -> study_stat

study_stat regexp

returns
study status of regexp.

Sourceval get_stringnumber : regexp -> string -> int

get_stringnumber rex name

returns
the index of the named substring name in regular expression rex. This index can then be used with get_substring.

raises Invalid_arg
if there is no such named substring.

Sourceval get_match_limit : regexp -> int option

get_match_limit rex

returns
some match limit of regular expression rex or None.

Sourceval 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

Sourcetype chtables

Alternative set of char tables for pattern matching

Sourceval maketables : unit -> chtables

Generates new set of char tables for the current locale.

Source

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.

parameter study
default = true

parameter limit
default = no extra limit other than default

parameter limit_recursion
default = no extra limit_recursion other than default

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter chtables
default = builtin char tables

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 http://www.perl.com
www.perl.com

Source

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 regexp, but combines patterns as alternatives (or-patterns) into one regular expression.

Sourceval quote : string -> string

quote str

returns
the quoted string of str.

Subpattern extraction

Sourcetype substrings

Information on substrings after pattern matching

Sourceval get_subject : substrings -> string

get_subject substrings

returns
the subject string of substrings.

Sourceval num_of_subs : substrings -> int

num_of_subs substrings

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

Sourceval get_substring : substrings -> int -> string

get_substring substrings n

returns
the nth substring (0 is whole match) of substrings.

raises Invalid_argument
if n is not in the range of the number of substrings.

raises Not_found
if the corresponding subpattern did not capture a substring.

Sourceval get_substring_ofs : substrings -> int -> int * int

get_substring_ofs substrings n

returns
the offset tuple of the nth substring of substrings (0 is whole match).

raises Invalid_argument
if n is not in the range of the number of substrings.

raises Not_found
if the corresponding subpattern did not capture a substring.

Sourceval 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.

parameter full_match
default = true

Sourceval 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.

parameter full_match
default = true

Sourceval get_named_substring : regexp -> string -> substrings -> string

get_named_substring rex name substrings

returns
the named substring name in regular expression rex and substrings.

raises Invalid_argument
if there is no such named substring.

raises Not_found
if the corresponding subpattern did not capture a substring.

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

get_named_substring_ofs rex name substrings

returns
the offset tuple of the named substring name in regular expression rex and substrings.

raises Invalid_argument
if there is no such named substring.

raises Not_found
if the corresponding subpattern did not capture a substring.

Callouts

Sourcetype 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
*)

}

Sourcetype 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

Source

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

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

raises Not_found
if pattern does not match.

Source

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

pcre_dfa_exec ?iflags ?flags ?rex ?pat ?pos ?callout ?workspace subj invokes the "alternative" DFA matching function.

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. Requires a sufficiently-large workspace array. Callouts are handled by callout.

Note that the returned array of offsets are quite different from those returned by pcre_exec et al. The motivating use case for the DFA match function is to be able to restart a partial match with N additional input segments. Because the match function/workspace does not store segments seen previously, the offsets returned when a match completes will refer only to the matching portion of the last subject string provided. Thus, returned offsets from this function should not be used to support extracting captured submatches. If you need to capture submatches from a series of inputs incrementally matched with this function, you'll need to concatenate those inputs that yield a successful match here and re-run the same pattern against that single subject string.

Aside from an absolute minimum of 20, PCRE does not provide any guidance regarding the size of workspace array needed by any given pattern. Therefore, it is wise to appropriately handle the possible WorkspaceSize error. If raised, you can allocate a new, larger workspace array and begin the DFA matching process again.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

parameter workspace
default = fresh array of length 20

raises Not_found
if the pattern match has failed

raises Error
Partial if the pattern has matched partially; a subsequent exec call with the same pattern and workspace (adding the DFA_RESTART flag) be made to either further advance or complete the partial match.

raises Error
WorkspaceSize if the workspace array is too small to accommodate the DFA state required by the supplied pattern

Source

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

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

raises Not_found
if pattern does not match.

Source

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

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

raises Not_found
if pattern does not match.

Source

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

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

raises Not_found
if pattern does not match.

raises Invalid_arg
if pos let matching start outside of the subject string.

Source

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

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter full_match
default = true

parameter callout
default = ignore callouts

raises Not_found
if pattern does not match.

Source

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

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter full_match
default = true

parameter callout
default = ignore callouts

raises Not_found
if pattern does not match.

Source

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

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter full_match
default = true

parameter callout
default = ignore callouts

raises Not_found
if pattern does not match.

Source

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

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter full_match
default = true

parameter callout
default = ignore callouts

raises Not_found
if pattern does not match.

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

String substitution

Sourcetype substitution

Information on substitution patterns

Sourceval 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.

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter itempl
default = empty string

parameter templ
default = ignored

parameter callout
default = ignore callouts

raises Failure
if there are backreferences to nonexistent subpatterns.

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter templ
default = ignored

parameter callout
default = ignore callouts

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter itempl
default = empty string

parameter templ
default = ignored

parameter callout
default = ignore callouts

raises Failure
if there are backreferences to nonexistent subpatterns.

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter templ
default = ignored

parameter callout
default = ignore callouts

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter callout
default = ignore callouts

Splitting

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter max
default = 0

parameter callout
default = ignore callouts

Source

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.

Sourcetype 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

Source

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.

parameter iflags
default = no extra flags

parameter flags
default = ignored

parameter rex
default = matches whitespace

parameter pat
default = ignored

parameter pos
default = 0

parameter max
default = 0

parameter callout
default = ignore callouts

Additional convenience functions

Sourceval foreach_line : ?ic:in_channel -> (string -> unit) -> unit

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

parameter ic
default = stdin

Sourceval foreach_file : string list -> (string -> 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!

Source

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 callout. You should read the C-source to know what happens. If you do not understand it - don't use this function!

Sourceval 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.

Source

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

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

Install

Dune Dependency

Authors

Maintainers

Sources

doc/pcre/Pcre/index.html

Module `Pcre`Source

Exceptions

Compilation and runtime flags and their conversion functions

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

Information on patterns

Compilation of patterns

Subpattern extraction

Callouts

Matching of patterns and subpattern extraction

String substitution

Splitting

Additional convenience functions

UNSAFE STUFF - USE WITH CAUTION!

package pcre

Install

Dune Dependency

Authors

Maintainers

Sources

doc/pcre/Pcre/index.html

Module PcreSource

Exceptions

Compilation and runtime flags and their conversion functions

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

Information on patterns

Compilation of patterns

Subpattern extraction

Callouts

Matching of patterns and subpattern extraction

String substitution

Splitting

Additional convenience functions

UNSAFE STUFF - USE WITH CAUTION!

Module `Pcre`Source