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<title>pcre2callout specification</title>
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<h1>pcre2callout man page</h1>

Return to the <a href="index.html">PCRE2 index page</a>.


This page is part of the PCRE2 HTML documentation. It was generated
automatically from the original man page. If there is any nonsense in it,
please consult the man page, in case the conversion went wrong.
 
<ul>
<li><a name="TOC1" href="#SEC1">SYNOPSIS</a>
<li><a name="TOC2" href="#SEC2">DESCRIPTION</a>
<li><a name="TOC3" href="#SEC3">MISSING CALLOUTS</a>
<li><a name="TOC4" href="#SEC4">THE CALLOUT INTERFACE</a>
<li><a name="TOC5" href="#SEC5">RETURN VALUES FROM CALLOUTS</a>
<li><a name="TOC6" href="#SEC6">CALLOUT ENUMERATION</a>
<li><a name="TOC7" href="#SEC7">AUTHOR</a>
<li><a name="TOC8" href="#SEC8">REVISION</a>
</ul>
 <a name="SEC1" href="#TOC1">SYNOPSIS</a> 

#include &#60;pcre2.h&#62;


int (*pcre2_callout)(pcre2_callout_block *, void *);
 
 
int pcre2_callout_enumerate(const pcre2_code *code,
 int (*callback)(pcre2_callout_enumerate_block *, void *),
 void *user_data);

 <a name="SEC2" href="#TOC1">DESCRIPTION</a> 

PCRE2 provides a feature called "callout", which is a means of temporarily
passing control to the caller of PCRE2 in the middle of pattern matching. The
caller of PCRE2 provides an external function by putting its entry point in
a match context (see pcre2_set_callout() in the
<a href="pcre2api.html">pcre2api</a>
documentation).


Within a regular expression, (?C&#60;arg&#62;) indicates a point at which the external
function is to be called. Different callout points can be identified by putting
a number less than 256 after the letter C. The default value is zero.
Alternatively, the argument may be a delimited string. The starting delimiter
must be one of ` ' " ^ % # $ { and the ending delimiter is the same as the
start, except for {, where the ending delimiter is }. If the ending delimiter
is needed within the string, it must be doubled. For example, this pattern has
two callout points:
<pre>
 (?C1)abc(?C"some ""arbitrary"" text")def
</pre>
If the PCRE2_AUTO_CALLOUT option bit is set when a pattern is compiled, PCRE2
automatically inserts callouts, all with number 255, before each item in the
pattern except for immediately before or after an explicit callout. For
example, if PCRE2_AUTO_CALLOUT is used with the pattern
<pre>
 A(?C3)B
</pre>
it is processed as if it were
<pre>
 (?C255)A(?C3)B(?C255)
</pre>
Here is a more complicated example:
<pre>
 A(\d{2}|--)
</pre>
With PCRE2_AUTO_CALLOUT, this pattern is processed as if it were
<pre>
 (?C255)A(?C255)((?C255)\d{2}(?C255)|(?C255)-(?C255)-(?C255))(?C255)
</pre>
Notice that there is a callout before and after each parenthesis and
alternation bar. If the pattern contains a conditional group whose condition is
an assertion, an automatic callout is inserted immediately before the
condition. Such a callout may also be inserted explicitly, for example:
<pre>
 (?(?C9)(?=a)ab|de) (?(?C%text%)(?!=d)ab|de)
</pre>
This applies only to assertion conditions (because they are themselves
independent groups).


Callouts can be useful for tracking the progress of pattern matching. The
<a href="pcre2test.html">pcre2test</a>
program has a pattern qualifier (/auto_callout) that sets automatic callouts.
When any callouts are present, the output from pcre2test indicates how
the pattern is being matched. This is useful information when you are trying to
optimize the performance of a particular pattern.

 <a name="SEC3" href="#TOC1">MISSING CALLOUTS</a> 

You should be aware that, because of optimizations in the way PCRE2 compiles
and matches patterns, callouts sometimes do not happen exactly as you might
expect.

 
Auto-possessification
 

At compile time, PCRE2 "auto-possessifies" repeated items when it knows that
what follows cannot be part of the repeat. For example, a+[bc] is compiled as
if it were a++[bc]. The pcre2test output when this pattern is compiled
with PCRE2_ANCHORED and PCRE2_AUTO_CALLOUT and then applied to the string
"aaaa" is:
<pre>
 ---&#62;aaaa
 +0 ^ a+
 +2 ^ ^ [bc]
 No match
</pre>
This indicates that when matching [bc] fails, there is no backtracking into a+
(because it is being treated as a++) and therefore the callouts that would be
taken for the backtracks do not occur. You can disable the auto-possessify
feature by passing PCRE2_NO_AUTO_POSSESS to pcre2_compile(), or starting
the pattern with (*NO_AUTO_POSSESS). In this case, the output changes to this:
<pre>
 ---&#62;aaaa
 +0 ^ a+
 +2 ^ ^ [bc]
 +2 ^ ^ [bc]
 +2 ^ ^ [bc]
 +2 ^^ [bc]
 No match
</pre>
This time, when matching [bc] fails, the matcher backtracks into a+ and tries
again, repeatedly, until a+ itself fails.

 
Automatic .* anchoring
 

By default, an optimization is applied when .* is the first significant item in
a pattern. If PCRE2_DOTALL is set, so that the dot can match any character, the
pattern is automatically anchored. If PCRE2_DOTALL is not set, a match can
start only after an internal newline or at the beginning of the subject, and
pcre2_compile() remembers this. If a pattern has more than one top-level
branch, automatic anchoring occurs if all branches are anchorable.


This optimization is disabled, however, if .* is in an atomic group or if there
is a backreference to the capturing group in which it appears. It is also
disabled if the pattern contains (*PRUNE) or (*SKIP). However, the presence of
callouts does not affect it.


For example, if the pattern .*\d is compiled with PCRE2_AUTO_CALLOUT and
applied to the string "aa", the pcre2test output is:
<pre>
 ---&#62;aa
 +0 ^ .*
 +2 ^ ^ \d
 +2 ^^ \d
 +2 ^ \d
 No match
</pre>
This shows that all match attempts start at the beginning of the subject. In
other words, the pattern is anchored. You can disable this optimization by
passing PCRE2_NO_DOTSTAR_ANCHOR to pcre2_compile(), or starting the
pattern with (*NO_DOTSTAR_ANCHOR). In this case, the output changes to:
<pre>
 ---&#62;aa
 +0 ^ .*
 +2 ^ ^ \d
 +2 ^^ \d
 +2 ^ \d
 +0 ^ .*
 +2 ^^ \d
 +2 ^ \d
 No match
</pre>
This shows more match attempts, starting at the second subject character.
Another optimization, described in the next section, means that there is no
subsequent attempt to match with an empty subject.

 
Other optimizations
 

Other optimizations that provide fast "no match" results also affect callouts.
For example, if the pattern is
<pre>
 ab(?C4)cd
</pre>
PCRE2 knows that any matching string must contain the letter "d". If the
subject string is "abyz", the lack of "d" means that matching doesn't ever
start, and the callout is never reached. However, with "abyd", though the
result is still no match, the callout is obeyed.


For most patterns PCRE2 also knows the minimum length of a matching string, and
will immediately give a "no match" return without actually running a match if
the subject is not long enough, or, for unanchored patterns, if it has been
scanned far enough.


You can disable these optimizations by passing the PCRE2_NO_START_OPTIMIZE
option to pcre2_compile(), or by starting the pattern with
(*NO_START_OPT). This slows down the matching process, but does ensure that
callouts such as the example above are obeyed.
<a name="calloutinterface"></a>
 <a name="SEC4" href="#TOC1">THE CALLOUT INTERFACE</a> 

During matching, when PCRE2 reaches a callout point, if an external function is
provided in the match context, it is called. This applies to both normal,
DFA, and JIT matching. The first argument to the callout function is a pointer
to a pcre2_callout block. The second argument is the void * callout data
that was supplied when the callout was set up by calling
pcre2_set_callout() (see the
<a href="pcre2api.html">pcre2api</a>
documentation). The callout block structure contains the following fields, not
necessarily in this order:
<pre>
 uint32_t version;
 uint32_t callout_number;
 uint32_t capture_top;
 uint32_t capture_last;
 uint32_t callout_flags;
 PCRE2_SIZE *offset_vector;
 PCRE2_SPTR mark;
 PCRE2_SPTR subject;
 PCRE2_SIZE subject_length;
 PCRE2_SIZE start_match;
 PCRE2_SIZE current_position;
 PCRE2_SIZE pattern_position;
 PCRE2_SIZE next_item_length;
 PCRE2_SIZE callout_string_offset;
 PCRE2_SIZE callout_string_length;
 PCRE2_SPTR callout_string;
</pre>
The version field contains the version number of the block format. The
current version is 2; the three callout string fields were added for version 1,
and the callout_flags field for version 2. If you are writing an
application that might use an earlier release of PCRE2, you should check the
version number before accessing any of these fields. The version number will
increase in future if more fields are added, but the intention is never to
remove any of the existing fields.

 
Fields for numerical callouts
 

For a numerical callout, callout_string is NULL, and callout_number
contains the number of the callout, in the range 0-255. This is the number
that follows (?C for callouts that part of the pattern; it is 255 for
automatically generated callouts.

 
Fields for string callouts
 

For callouts with string arguments, callout_number is always zero, and
callout_string points to the string that is contained within the compiled
pattern. Its length is given by callout_string_length. Duplicated ending
delimiters that were present in the original pattern string have been turned
into single characters, but there is no other processing of the callout string
argument. An additional code unit containing binary zero is present after the
string, but is not included in the length. The delimiter that was used to start
the string is also stored within the pattern, immediately before the string
itself. You can access this delimiter as callout_string[-1] if you need
it.


The callout_string_offset field is the code unit offset to the start of
the callout argument string within the original pattern string. This is
provided for the benefit of applications such as script languages that might
need to report errors in the callout string within the pattern.

 
Fields for all callouts
 

The remaining fields in the callout block are the same for both kinds of
callout.


The offset_vector field is a pointer to a vector of capturing offsets
(the "ovector"). You may read the elements in this vector, but you must not
change any of them.


For calls to pcre2_match(), the offset_vector field is not (since
release 10.30) a pointer to the actual ovector that was passed to the matching
function in the match data block. Instead it points to an internal ovector of a
size large enough to hold all possible captured substrings in the pattern. Note
that whenever a recursion or subroutine call within a pattern completes, the
capturing state is reset to what it was before.


The capture_last field contains the number of the most recently captured
substring, and the capture_top field contains one more than the number of
the highest numbered captured substring so far. If no substrings have yet been
captured, the value of capture_last is 0 and the value of
capture_top is 1. The values of these fields do not always differ by one;
for example, when the callout in the pattern ((a)(b))(?C2) is taken,
capture_last is 1 but capture_top is 4.


The contents of ovector[2] to ovector[&#60;capture_top&#62;*2-1] can be inspected in
order to extract substrings that have been matched so far, in the same way as
extracting substrings after a match has completed. The values in ovector[0] and
ovector[1] are always PCRE2_UNSET because the match is by definition not
complete. Substrings that have not been captured but whose numbers are less
than capture_top also have both of their ovector slots set to
PCRE2_UNSET.


For DFA matching, the offset_vector field points to the ovector that was
passed to the matching function in the match data block for callouts at the top
level, but to an internal ovector during the processing of pattern recursions,
lookarounds, and atomic groups. However, these ovectors hold no useful
information because pcre2_dfa_match() does not support substring
capturing. The value of capture_top is always 1 and the value of
capture_last is always 0 for DFA matching.


The subject and subject_length fields contain copies of the values
that were passed to the matching function.


The start_match field normally contains the offset within the subject at
which the current match attempt started. However, if the escape sequence \K
has been encountered, this value is changed to reflect the modified starting
point. If the pattern is not anchored, the callout function may be called
several times from the same point in the pattern for different starting points
in the subject.


The current_position field contains the offset within the subject of the
current match pointer.


The pattern_position field contains the offset in the pattern string to
the next item to be matched.


The next_item_length field contains the length of the next item to be
processed in the pattern string. When the callout is at the end of the pattern,
the length is zero. When the callout precedes an opening parenthesis, the
length includes meta characters that follow the parenthesis. For example, in a
callout before an assertion such as (?=ab) the length is 3. For an an
alternation bar or a closing parenthesis, the length is one, unless a closing
parenthesis is followed by a quantifier, in which case its length is included.
(This changed in release 10.23. In earlier releases, before an opening
parenthesis the length was that of the entire subpattern, and before an
alternation bar or a closing parenthesis the length was zero.)


The pattern_position and next_item_length fields are intended to
help in distinguishing between different automatic callouts, which all have the
same callout number. However, they are set for all callouts, and are used by
pcre2test to show the next item to be matched when displaying callout
information.


In callouts from pcre2_match() the mark field contains a pointer to
the zero-terminated name of the most recently passed (*MARK), (*PRUNE), or
(*THEN) item in the match, or NULL if no such items have been passed. Instances
of (*PRUNE) or (*THEN) without a name do not obliterate a previous (*MARK). In
callouts from the DFA matching function this field always contains NULL.


The callout_flags field is always zero in callouts from
pcre2_dfa_match() or when JIT is being used. When pcre2_match()
without JIT is used, the following bits may be set:
<pre>
 PCRE2_CALLOUT_STARTMATCH
</pre>
This is set for the first callout after the start of matching for each new
starting position in the subject.
<pre>
 PCRE2_CALLOUT_BACKTRACK
</pre>
This is set if there has been a matching backtrack since the previous callout,
or since the start of matching if this is the first callout from a
pcre2_match() run.


Both bits are set when a backtrack has caused a "bumpalong" to a new starting
position in the subject. Output from pcre2test does not indicate the
presence of these bits unless the callout_extra modifier is set.


The information in the callout_flags field is provided so that
applications can track and tell their users how matching with backtracking is
done. This can be useful when trying to optimize patterns, or just to
understand how PCRE2 works. There is no support in pcre2_dfa_match()
because there is no backtracking in DFA matching, and there is no support in
JIT because JIT is all about maximimizing matching performance. In both these
cases the callout_flags field is always zero.

 <a name="SEC5" href="#TOC1">RETURN VALUES FROM CALLOUTS</a> 

The external callout function returns an integer to PCRE2. If the value is
zero, matching proceeds as normal. If the value is greater than zero, matching
fails at the current point, but the testing of other matching possibilities
goes ahead, just as if a lookahead assertion had failed. If the value is less
than zero, the match is abandoned, and the matching function returns the
negative value.


Negative values should normally be chosen from the set of PCRE2_ERROR_xxx
values. In particular, PCRE2_ERROR_NOMATCH forces a standard "no match"
failure. The error number PCRE2_ERROR_CALLOUT is reserved for use by callout
functions; it will never be used by PCRE2 itself.

 <a name="SEC6" href="#TOC1">CALLOUT ENUMERATION</a> 

int pcre2_callout_enumerate(const pcre2_code *code,
 int (*callback)(pcre2_callout_enumerate_block *, void *),
 void *user_data);
 
 
A script language that supports the use of string arguments in callouts might
like to scan all the callouts in a pattern before running the match. This can
be done by calling pcre2_callout_enumerate(). The first argument is a
pointer to a compiled pattern, the second points to a callback function, and
the third is arbitrary user data. The callback function is called for every
callout in the pattern in the order in which they appear. Its first argument is
a pointer to a callout enumeration block, and its second argument is the
user_data value that was passed to pcre2_callout_enumerate(). The
data block contains the following fields:
<pre>
 version Block version number
 pattern_position Offset to next item in pattern
 next_item_length Length of next item in pattern
 callout_number Number for numbered callouts
 callout_string_offset Offset to string within pattern
 callout_string_length Length of callout string
 callout_string Points to callout string or is NULL
</pre>
The version number is currently 0. It will increase if new fields are ever
added to the block. The remaining fields are the same as their namesakes in the
pcre2_callout block that is used for callouts during matching, as
described
<a href="#calloutinterface">above.</a>


Note that the value of pattern_position is unique for each callout.
However, if a callout occurs inside a group that is quantified with a non-zero
minimum or a fixed maximum, the group is replicated inside the compiled
pattern. For example, a pattern such as /(a){2}/ is compiled as if it were
/(a)(a)/. This means that the callout will be enumerated more than once, but
with the same value for pattern_position in each case.


The callback function should normally return zero. If it returns a non-zero
value, scanning the pattern stops, and that value is returned from
pcre2_callout_enumerate().

 <a name="SEC7" href="#TOC1">AUTHOR</a> 

Philip Hazel
 
University Computing Service
 
Cambridge, England.
 

 <a name="SEC8" href="#TOC1">REVISION</a> 

Last updated: 26 April 2018
 
Copyright &copy; 1997-2018 University of Cambridge.
 

Return to the <a href="index.html">PCRE2 index page</a>.

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pcre2_set_match_limit.html	text/html	1.04 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_set_max_pattern_length.html	text/html	1.3 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_set_newline.html	text/html	1.53 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_set_offset_limit.html	text/html	1.05 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_set_parens_nest_limit.html	text/html	1.1 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_set_recursion_limit.html	text/html	1.07 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_set_recursion_memory_management.html	text/html	1.22 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substitute.html	text/html	3.99 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_copy_byname.html	text/html	2.01 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_copy_bynumber.html	text/html	1.82 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_free.html	text/html	1.17 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_get_byname.html	text/html	2.14 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_get_bynumber.html	text/html	1.98 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_length_byname.html	text/html	1.33 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_length_bynumber.html	text/html	1.48 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_list_free.html	text/html	1.18 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_list_get.html	text/html	2.09 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_nametable_scan.html	text/html	1.8 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2_substring_number_from_name.html	text/html	1.61 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2api.html	text/html	167.89 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2build.html	text/html	24.21 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2callout.html	text/html	19.59 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2compat.html	text/html	10.06 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2convert.html	text/html	7.7 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2demo.html	text/x-c	19.69 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2grep.html	text/html	46.98 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2jit.html	text/html	19.57 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2limits.html	text/html	3.18 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2matching.html	text/html	10.61 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2partial.html	text/html	20.34 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2pattern.html	text/html	152.23 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2perform.html	text/html	11.57 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2posix.html	text/html	14.16 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2sample.html	text/html	3.81 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2serialize.html	text/html	9.85 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2syntax.html	text/html	20 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2test.html	text/html	85.01 KB	root/root	-rw-r--r--	2018-09-11 02:16:19
pcre2unicode.html	text/html	11.87 KB	root/root	-rw-r--r--	2018-09-11 02:16:19