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Substitute code update and documentation.

This commit is contained in:
Philip.Hazel 2014-11-11 16:51:07 +00:00
parent bb34dede56
commit b3ac0ffb32
21 changed files with 978 additions and 551 deletions
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2
Makefile.am
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@ -63,6 +63,7 @@ dist_html_DATA = \
doc/html/pcre2_set_parens_nest_limit.html \
doc/html/pcre2_set_recursion_limit.html \
doc/html/pcre2_set_recursion_memory_management.html \
doc/html/pcre2_substitute.html \
doc/html/pcre2_substring_copy_byname.html \
doc/html/pcre2_substring_copy_bynumber.html \
doc/html/pcre2_substring_free.html \
@ -134,6 +135,7 @@ dist_man_MANS = \
doc/pcre2_set_parens_nest_limit.3 \
doc/pcre2_set_recursion_limit.3 \
doc/pcre2_set_recursion_memory_management.3 \
doc/pcre2_substitute.3 \
doc/pcre2_substring_copy_byname.3 \
doc/pcre2_substring_copy_bynumber.3 \
doc/pcre2_substring_free.3 \

4
doc/html/index.html
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@ -204,6 +204,10 @@ in the library.
<tr><td><a href="pcre2_set_recursion_memory_management.html">pcre2_set_recursion_memory_management</a></td>
<td>&nbsp;&nbsp;Set match recursion memory management</td></tr>
<tr><td><a href="pcre2_substitute.html">pcre2_substitute</a></td>
<td>&nbsp;&nbsp;Match a compiled pattern to a subject string and do
substitutions</td></tr>
<tr><td><a href="pcre2_substring_copy_byname.html">pcre2_substring_copy_byname</a></td>
<td>&nbsp;&nbsp;Extract named substring into given buffer</td></tr>

4
doc/html/pcre2_config.html
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@ -70,8 +70,8 @@ available codes are:
</pre>
The function yields a non-negative value on success or the negative value
PCRE2_ERROR_BADOPTION otherwise. This is also the result for the
PCRE2_CONFIG_JITTARGET code if JIT support is not available. When a string
is returned the yield is the length of the string, in code units, excluding the
PCRE2_CONFIG_JITTARGET code if JIT support is not available. When a string is
requested, the function returns the number of code units used, including the
terminating zero.
</P>
<P>

8
doc/html/pcre2_jit_match.html
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@ -22,7 +22,7 @@ SYNOPSIS
<b>int pcre2_jit_match(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
<b> uint32_t <i>options</i>, pcre2_match_data *<i>match_data</i>,</b>
<b> pcre2_match_context *<i>mcontext</i>, pcre2_jit_stack *<i>jit_stack</i>);</b>
<b> pcre2_match_context *<i>mcontext</i>);</b>
</P>
<br><b>
DESCRIPTION
@ -33,11 +33,7 @@ processed by the JIT compiler against a given subject string, using a matching
algorithm that is similar to Perl's. It is a "fast path" interface to JIT, and
it bypasses some of the sanity checks that <b>pcre2_match()</b> applies.
Its arguments are exactly the same as for
<a href="pcre2_match.html"><b>pcre2_match()</b></a>
plus one additional argument that must either point to a JIT stack or be NULL.
In the latter case, if a callback function has been set up by
<b>pcre2_jit_stack_create()</b>, it is called. Otherwise the system stack is
used.
<a href="pcre2_match.html"><b>pcre2_match()</b>.</a>
</P>
<P>
The supported options are PCRE2_NOTBOL, PCRE2_NOTEOL, PCRE2_NOTEMPTY,

14
doc/html/pcre2_jit_stack_assign.html
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@ -19,18 +19,20 @@ SYNOPSIS
<b>#include &#60;pcre2.h&#62;</b>
</P>
<P>
<b>void pcre2_jit_stack_assign(const pcre2_code *<i>code</i>,</b>
<b>void pcre2_jit_stack_assign(pcre2_match_context *<i>mcontext</i>,</b>
<b> pcre2_jit_callback <i>callback_function</i>, void *<i>callback_data</i>);</b>
</P>
<br><b>
DESCRIPTION
</b><br>
<P>
This function provides control over the memory used as a stack at run-time by a
call to <b>pcre2_match()</b> or <b>pcre2_jit_match()</b> with a pattern that has
been successfully processed by the JIT compiler. The arguments are:
This function provides control over the memory used by JIT as a run-time stack
when <b>pcre2_match()</b> or <b>pcre2_jit_match()</b> is called with a pattern
that has been successfully processed by the JIT compiler. The information that
determines which stack is used is put into a match context that is subsequently
passed to a matching function. The arguments of this function are:
<pre>
code the pointer returned by <b>pcre2_compile()</b>
mcontext a pointer to a match context
callback a callback function
callback_data a JIT stack or a value to be passed to the callback
</PRE>
@ -51,7 +53,7 @@ result is NULL, the internal 32K stack is used; otherwise the return value must
be a valid JIT stack, the result of calling <b>pcre2_jit_stack_create()</b>.
</P>
<P>
You may safely assign the same JIT stack to multiple patterns, as long as they
You may safely use the same JIT stack for multiple patterns, as long as they
are all matched in the same thread. In a multithread application, each thread
must use its own JIT stack. For more details, see the
<a href="pcre2jit.html"><b>pcre2jit</b></a>

2
doc/html/pcre2_match_data_create_from_pattern.html
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@ -19,7 +19,7 @@ SYNOPSIS
<b>#include &#60;pcre2.h&#62;</b>
</P>
<P>
<b>pcre2_match_data_create_from_pattern(pcre2_code *<i>code</i>,</b>
<b>pcre2_match_data_create_from_pattern(const pcre2_code *<i>code</i>,</b>
<b> pcre2_general_context *<i>gcontext</i>);</b>
</P>
<br><b>

85
doc/html/pcre2_substitute.html Normal file
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@ -0,0 +1,85 @@
<html>
<head>
<title>pcre2_substitute specification</title>
</head>
<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
<h1>pcre2_substitute man page</h1>
<p>
Return to the <a href="index.html">PCRE2 index page</a>.
</p>
<p>
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.
<br>
<br><b>
SYNOPSIS
</b><br>
<P>
<b>#include &#60;pcre2.h&#62;</b>
</P>
<P>
<b>int pcre2_substitute(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
<b> uint32_t <i>options</i>, pcre2_match_data *<i>match_data</i>,</b>
<b> pcre2_match_context *<i>mcontext</i>, PCRE2_SPTR \fIreplacementzfP,</b>
<b> PCRE2_SIZE <i>rlength</i>, PCRE2_UCHAR *<i>outputbuffer</i>,</b>
<b> PCRE2_SIZE *<i>outlengthptr</i>);</b>
</P>
<br><b>
DESCRIPTION
</b><br>
<P>
This function matches a compiled regular expression against a given subject
string, using a matching algorithm that is similar to Perl's. It then makes a
copy of the subject, substituting a replacement string for what was matched.
Its arguments are:
<pre>
<i>code</i> Points to the compiled pattern
<i>subject</i> Points to the subject string
<i>length</i> Length of the subject string
<i>startoffset</i> Offset in the subject at which to start matching
<i>options</i> Option bits
<i>match_data</i> Points to a match data block, or is NULL
<i>mcontext</i> Points to a match context, or is NULL
<i>replacement</i> Points to the replacement string
<i>rlength</i> Length of the replacement string
<i>outputbuffer</i> Points to the output buffer
<i>outlengthptr</i> Points to the length of the output buffer
</pre>
A match context is needed only if you want to:
<pre>
Set up a callout function
Change the limit for calling the internal function <i>match()</i>
Change the limit for calling <i>match()</i> recursively
Set custom memory management when the heap is used for recursion
</pre>
The <i>length</i>, <i>startoffset</i> and <i>rlength</i> values are code
units, not characters, as is the contents of the variable pointed at by
<i>outlengthptr</i>, which is updated to the actual length of the new string.
The options are:
<pre>
PCRE2_ANCHORED Match only at the first position
PCRE2_NOTBOL Subject string is not the beginning of a line
PCRE2_NOTEOL Subject string is not the end of a line
PCRE2_NOTEMPTY An empty string is not a valid match
PCRE2_NOTEMPTY_ATSTART An empty string at the start of the subject
is not a valid match
PCRE2_NO_UTF_CHECK Do not check the subject or replacement for
UTF validity (only relevant if PCRE2_UTF
was set at compile time)
PCRE2_SUBSTITUTE_GLOBAL Replace all occurrences in the subject
</pre>
The function returns the number of substitutions, which may be zero if there
were no matches. The result can be greater than one only when
PCRE2_SUBSTITUTE_GLOBAL is set.
</P>
<P>
There is a complete description of the PCRE2 native API in the
<a href="pcre2api.html"><b>pcre2api</b></a>
page and a description of the POSIX API in the
<a href="pcre2posix.html"><b>pcre2posix</b></a>
page.
<p>
Return to the <a href="index.html">PCRE2 index page</a>.
</p>

218
doc/html/pcre2api.html
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@ -19,32 +19,34 @@ please consult the man page, in case the conversion went wrong.
<li><a name="TOC4" href="#SEC4">PCRE2 NATIVE API COMPILE CONTEXT FUNCTIONS</a>
<li><a name="TOC5" href="#SEC5">PCRE2 NATIVE API MATCH CONTEXT FUNCTIONS</a>
<li><a name="TOC6" href="#SEC6">PCRE2 NATIVE API STRING EXTRACTION FUNCTIONS</a>
<li><a name="TOC7" href="#SEC7">PCRE2 NATIVE API JIT FUNCTIONS</a>
<li><a name="TOC8" href="#SEC8">PCRE2 NATIVE API AUXILIARY FUNCTIONS</a>
<li><a name="TOC9" href="#SEC9">PCRE2 8-BIT, 16-BIT, AND 32-BIT LIBRARIES</a>
<li><a name="TOC10" href="#SEC10">PCRE2 API OVERVIEW</a>
<li><a name="TOC11" href="#SEC11">NEWLINES</a>
<li><a name="TOC12" href="#SEC12">MULTITHREADING</a>
<li><a name="TOC13" href="#SEC13">PCRE2 CONTEXTS</a>
<li><a name="TOC14" href="#SEC14">CHECKING BUILD-TIME OPTIONS</a>
<li><a name="TOC15" href="#SEC15">COMPILING A PATTERN</a>
<li><a name="TOC16" href="#SEC16">COMPILATION ERROR CODES</a>
<li><a name="TOC17" href="#SEC17">JUST-IN-TIME (JIT) COMPILATION</a>
<li><a name="TOC18" href="#SEC18">LOCALE SUPPORT</a>
<li><a name="TOC19" href="#SEC19">INFORMATION ABOUT A COMPILED PATTERN</a>
<li><a name="TOC20" href="#SEC20">THE MATCH DATA BLOCK</a>
<li><a name="TOC21" href="#SEC21">MATCHING A PATTERN: THE TRADITIONAL FUNCTION</a>
<li><a name="TOC22" href="#SEC22">NEWLINE HANDLING WHEN MATCHING</a>
<li><a name="TOC23" href="#SEC23">HOW PCRE2_MATCH() RETURNS A STRING AND CAPTURED SUBSTRINGS</a>
<li><a name="TOC24" href="#SEC24">EXTRACTING CAPTURED SUBSTRINGS BY NUMBER</a>
<li><a name="TOC25" href="#SEC25">EXTRACTING A LIST OF ALL CAPTURED SUBSTRINGS</a>
<li><a name="TOC26" href="#SEC26">EXTRACTING CAPTURED SUBSTRINGS BY NAME</a>
<li><a name="TOC27" href="#SEC27">DUPLICATE SUBPATTERN NAMES</a>
<li><a name="TOC28" href="#SEC28">FINDING ALL POSSIBLE MATCHES</a>
<li><a name="TOC29" href="#SEC29">MATCHING A PATTERN: THE ALTERNATIVE FUNCTION</a>
<li><a name="TOC30" href="#SEC30">SEE ALSO</a>
<li><a name="TOC31" href="#SEC31">AUTHOR</a>
<li><a name="TOC32" href="#SEC32">REVISION</a>
<li><a name="TOC7" href="#SEC7">PCRE2 NATIVE API STRING SUBSTITUTION FUNCTION</a>
<li><a name="TOC8" href="#SEC8">PCRE2 NATIVE API JIT FUNCTIONS</a>
<li><a name="TOC9" href="#SEC9">PCRE2 NATIVE API AUXILIARY FUNCTIONS</a>
<li><a name="TOC10" href="#SEC10">PCRE2 8-BIT, 16-BIT, AND 32-BIT LIBRARIES</a>
<li><a name="TOC11" href="#SEC11">PCRE2 API OVERVIEW</a>
<li><a name="TOC12" href="#SEC12">NEWLINES</a>
<li><a name="TOC13" href="#SEC13">MULTITHREADING</a>
<li><a name="TOC14" href="#SEC14">PCRE2 CONTEXTS</a>
<li><a name="TOC15" href="#SEC15">CHECKING BUILD-TIME OPTIONS</a>
<li><a name="TOC16" href="#SEC16">COMPILING A PATTERN</a>
<li><a name="TOC17" href="#SEC17">COMPILATION ERROR CODES</a>
<li><a name="TOC18" href="#SEC18">JUST-IN-TIME (JIT) COMPILATION</a>
<li><a name="TOC19" href="#SEC19">LOCALE SUPPORT</a>
<li><a name="TOC20" href="#SEC20">INFORMATION ABOUT A COMPILED PATTERN</a>
<li><a name="TOC21" href="#SEC21">THE MATCH DATA BLOCK</a>
<li><a name="TOC22" href="#SEC22">MATCHING A PATTERN: THE TRADITIONAL FUNCTION</a>
<li><a name="TOC23" href="#SEC23">NEWLINE HANDLING WHEN MATCHING</a>
<li><a name="TOC24" href="#SEC24">HOW PCRE2_MATCH() RETURNS A STRING AND CAPTURED SUBSTRINGS</a>
<li><a name="TOC25" href="#SEC25">EXTRACTING CAPTURED SUBSTRINGS BY NUMBER</a>
<li><a name="TOC26" href="#SEC26">EXTRACTING A LIST OF ALL CAPTURED SUBSTRINGS</a>
<li><a name="TOC27" href="#SEC27">EXTRACTING CAPTURED SUBSTRINGS BY NAME</a>
<li><a name="TOC28" href="#SEC28">CREATING A NEW STRING WITH SUBSTITUTIONS</a>
<li><a name="TOC29" href="#SEC29">DUPLICATE SUBPATTERN NAMES</a>
<li><a name="TOC30" href="#SEC30">FINDING ALL POSSIBLE MATCHES</a>
<li><a name="TOC31" href="#SEC31">MATCHING A PATTERN: THE ALTERNATIVE FUNCTION</a>
<li><a name="TOC32" href="#SEC32">SEE ALSO</a>
<li><a name="TOC33" href="#SEC33">AUTHOR</a>
<li><a name="TOC34" href="#SEC34">REVISION</a>
</ul>
<P>
<b>#include &#60;pcre2.h&#62;</b>
@ -69,7 +71,7 @@ document for an overview of all the PCRE2 documentation.
<b> pcre2_general_context *<i>gcontext</i>);</b>
<br>
<br>
<b>pcre2_match_data_create_from_pattern(pcre2_code *<i>code</i>,</b>
<b>pcre2_match_data_create_from_pattern(const pcre2_code *<i>code</i>,</b>
<b> pcre2_general_context *<i>gcontext</i>);</b>
<br>
<br>
@ -222,7 +224,16 @@ document for an overview of all the PCRE2 documentation.
<b>int pcre2_substring_list_get(pcre2_match_data *<i>match_data</i>,</b>
<b>" PCRE2_UCHAR ***<i>listptr</i>, PCRE2_SIZE **<i>lengthsptr</i>);</b>
</P>
<br><a name="SEC7" href="#TOC1">PCRE2 NATIVE API JIT FUNCTIONS</a><br>
<br><a name="SEC7" href="#TOC1">PCRE2 NATIVE API STRING SUBSTITUTION FUNCTION</a><br>
<P>
<b>int pcre2_substitute(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
<b> uint32_t <i>options</i>, pcre2_match_data *<i>match_data</i>,</b>
<b> pcre2_match_context *<i>mcontext</i>, PCRE2_SPTR \fIreplacementzfP,</b>
<b> PCRE2_SIZE <i>rlength</i>, PCRE2_UCHAR *<i>outputbuffer</i>,</b>
<b> PCRE2_SIZE *<i>outlengthptr</i>);</b>
</P>
<br><a name="SEC8" href="#TOC1">PCRE2 NATIVE API JIT FUNCTIONS</a><br>
<P>
<b>int pcre2_jit_compile(pcre2_code *<i>code</i>, uint32_t <i>options</i>);</b>
<br>
@ -230,7 +241,7 @@ document for an overview of all the PCRE2 documentation.
<b>int pcre2_jit_match(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
<b> uint32_t <i>options</i>, pcre2_match_data *<i>match_data</i>,</b>
<b> pcre2_match_context *<i>mcontext</i>, pcre2_jit_stack *<i>jit_stack</i>);</b>
<b> pcre2_match_context *<i>mcontext</i>);</b>
<br>
<br>
<b>void pcre2_jit_free_unused_memory(pcre2_general_context *<i>gcontext</i>);</b>
@ -240,13 +251,13 @@ document for an overview of all the PCRE2 documentation.
<b> PCRE2_SIZE <i>startsize</i>, PCRE2_SIZE <i>maxsize</i>);</b>
<br>
<br>
<b>void pcre2_jit_stack_assign(const pcre2_code *<i>code</i>,</b>
<b>void pcre2_jit_stack_assign(pcre2_match_context *<i>mcontext</i>,</b>
<b> pcre2_jit_callback <i>callback_function</i>, void *<i>callback_data</i>);</b>
<br>
<br>
<b>void pcre2_jit_stack_free(pcre2_jit_stack *<i>jit_stack</i>);</b>
</P>
<br><a name="SEC8" href="#TOC1">PCRE2 NATIVE API AUXILIARY FUNCTIONS</a><br>
<br><a name="SEC9" href="#TOC1">PCRE2 NATIVE API AUXILIARY FUNCTIONS</a><br>
<P>
<b>int pcre2_get_error_message(int <i>errorcode</i>, PCRE2_UCHAR *<i>buffer</i>,</b>
<b> PCRE2_SIZE <i>bufflen</i>);</b>
@ -260,7 +271,7 @@ document for an overview of all the PCRE2 documentation.
<br>
<b>int pcre2_config(uint32_t <i>what</i>, void *<i>where</i>);</b>
</P>
<br><a name="SEC9" href="#TOC1">PCRE2 8-BIT, 16-BIT, AND 32-BIT LIBRARIES</a><br>
<br><a name="SEC10" href="#TOC1">PCRE2 8-BIT, 16-BIT, AND 32-BIT LIBRARIES</a><br>
<P>
There are three PCRE2 libraries, supporting 8-bit, 16-bit, and 32-bit code
units, respectively. However, there is just one header file, <b>pcre2.h</b>.
@ -321,7 +332,7 @@ In the function summaries above, and in the rest of this document and other
PCRE2 documents, functions and data types are described using their generic
names, without the 8, 16, or 32 suffix.
</P>
<br><a name="SEC10" href="#TOC1">PCRE2 API OVERVIEW</a><br>
<br><a name="SEC11" href="#TOC1">PCRE2 API OVERVIEW</a><br>
<P>
PCRE2 has its own native API, which is described in this document. There are
also some wrapper functions for the 8-bit library that correspond to the
@ -386,8 +397,8 @@ documentation. There is no JIT support for <b>pcre2_dfa_match()</b>.
</P>
<P>
In addition to the main compiling and matching functions, there are convenience
functions for extracting captured substrings from a subject string that is
matched by <b>pcre2_match()</b>. They are:
functions for extracting captured substrings from a subject string that has
been matched by <b>pcre2_match()</b>. They are:
<pre>
<b>pcre2_substring_copy_byname()</b>
<b>pcre2_substring_copy_bynumber()</b>
@ -403,11 +414,16 @@ matched by <b>pcre2_match()</b>. They are:
provided, to free the memory used for extracted strings.
</P>
<P>
There are functions for finding out information about a compiled pattern
(<b>pcre2_pattern_info()</b>) and about the configuration with which PCRE2 was
built (<b>pcre2_config()</b>).
The function <b>pcre2_substitute()</b> can be called to match a pattern and
return a copy of the subject string with substitutions for parts that were
matched.
</P>
<P>
Finally, there are functions for finding out information about a compiled
pattern (<b>pcre2_pattern_info()</b>) and about the configuration with which
PCRE2 was built (<b>pcre2_config()</b>).
<a name="newlines"></a></P>
<br><a name="SEC11" href="#TOC1">NEWLINES</a><br>
<br><a name="SEC12" href="#TOC1">NEWLINES</a><br>
<P>
PCRE2 supports five different conventions for indicating line breaks in
strings: a single CR (carriage return) character, a single LF (linefeed)
@ -446,7 +462,7 @@ The choice of newline convention does not affect the interpretation of
the \n or \r escape sequences, nor does it affect what \R matches, which has
its own separate control.
</P>
<br><a name="SEC12" href="#TOC1">MULTITHREADING</a><br>
<br><a name="SEC13" href="#TOC1">MULTITHREADING</a><br>
<P>
In a multithreaded application it is important to keep thread-specific data
separate from data that can be shared between threads. The PCRE2 library code
@ -491,7 +507,7 @@ storing the results of a match. This includes details of what was matched, as
well as additional information such as the name of a (*MARK) setting. Each
thread must provide its own version of this memory.
</P>
<br><a name="SEC13" href="#TOC1">PCRE2 CONTEXTS</a><br>
<br><a name="SEC14" href="#TOC1">PCRE2 CONTEXTS</a><br>
<P>
Some PCRE2 functions have a lot of parameters, many of which are used only by
specialist applications, for example, those that use custom memory management
@ -765,7 +781,7 @@ so that they can be re-used when possible during the match. In the absence of
these functions, the normal custom memory management functions are used, if
supplied, otherwise the system functions.
</P>
<br><a name="SEC14" href="#TOC1">CHECKING BUILD-TIME OPTIONS</a><br>
<br><a name="SEC15" href="#TOC1">CHECKING BUILD-TIME OPTIONS</a><br>
<P>
<b>int pcre2_config(uint32_t <i>what</i>, void *<i>where</i>);</b>
</P>
@ -809,8 +825,9 @@ units long. (The exact length needed can be found by calling
<b>pcre2_config()</b> with <b>where</b> set to NULL.) The buffer is filled with a
string that contains the name of the architecture for which the JIT compiler is
configured, for example "x86 32bit (little endian + unaligned)". If JIT support
is not available, PCRE2_ERROR_BADOPTION is returned, otherwise the length of
the string, in code units, is returned.
is not available, PCRE2_ERROR_BADOPTION is returned, otherwise the number of
code units used is returned. This is the length of the string, plus one unit
for the terminating zero.
<pre>
PCRE2_CONFIG_LINKSIZE
</pre>
@ -878,8 +895,8 @@ units long. (The exact length needed can be found by calling
<b>pcre2_config()</b> with <b>where</b> set to NULL.) If PCRE2 has been compiled
without Unicode support, the buffer is filled with the text "Unicode not
supported". Otherwise, the Unicode version string (for example, "7.0.0") is
inserted. The string is zero-terminated. The function returns the length of the
string in code units.
inserted. The number of code units used is returned. This is the length of the
string plus one unit for the terminating zero.
<pre>
PCRE2_CONFIG_UNICODE
</pre>
@ -891,10 +908,11 @@ otherwise it is set to zero. Unicode support implies UTF support.
The <i>where</i> argument should point to a buffer that is at least 12 code
units long. (The exact length needed can be found by calling
<b>pcre2_config()</b> with <b>where</b> set to NULL.) The buffer is filled with
the PCRE2 version string, zero-terminated. The length of the string (in code
units) is returned.
the PCRE2 version string, zero-terminated. The number of code units used is
returned. This is the length of the string plus one unit for the terminating
zero.
<a name="compiling"></a></P>
<br><a name="SEC15" href="#TOC1">COMPILING A PATTERN</a><br>
<br><a name="SEC16" href="#TOC1">COMPILING A PATTERN</a><br>
<P>
<b>pcre2_code *pcre2_compile(PCRE2_SPTR <i>pattern</i>, PCRE2_SIZE <i>length</i>,</b>
<b> uint32_t <i>options</i>, int *<i>errorcode</i>, PCRE2_SIZE *<i>erroroffset,</i></b>
@ -1248,7 +1266,7 @@ of how this option changes the behaviour of PCRE2 are given in the
<a href="pcre2unicode.html"><b>pcre2unicode</b></a>
page.
</P>
<br><a name="SEC16" href="#TOC1">COMPILATION ERROR CODES</a><br>
<br><a name="SEC17" href="#TOC1">COMPILATION ERROR CODES</a><br>
<P>
There are over 80 positive error codes that <b>pcre2_compile()</b> may return if
it finds an error in the pattern. There are also some negative error codes that
@ -1258,7 +1276,7 @@ are used for invalid UTF strings. These are the same as given by
page. The <b>pcre2_get_error_message()</b> function can be called to obtain a
textual error message from any error code.
</P>
<br><a name="SEC17" href="#TOC1">JUST-IN-TIME (JIT) COMPILATION</a><br>
<br><a name="SEC18" href="#TOC1">JUST-IN-TIME (JIT) COMPILATION</a><br>
<P>
<b>int pcre2_jit_compile(pcre2_code *<i>code</i>, uint32_t <i>options</i>);</b>
<br>
@ -1266,7 +1284,7 @@ textual error message from any error code.
<b>int pcre2_jit_match(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
<b> uint32_t <i>options</i>, pcre2_match_data *<i>match_data</i>,</b>
<b> pcre2_match_context *<i>mcontext</i>, pcre2_jit_stack *<i>jit_stack</i>);</b>
<b> pcre2_match_context *<i>mcontext</i>);</b>
<br>
<br>
<b>void pcre2_jit_free_unused_memory(pcre2_general_context *<i>gcontext</i>);</b>
@ -1276,7 +1294,7 @@ textual error message from any error code.
<b> PCRE2_SIZE <i>startsize</i>, PCRE2_SIZE <i>maxsize</i>);</b>
<br>
<br>
<b>void pcre2_jit_stack_assign(const pcre2_code *<i>code</i>,</b>
<b>void pcre2_jit_stack_assign(pcre2_match_context *<i>mcontext</i>,</b>
<b> pcre2_jit_callback <i>callback_function</i>, void *<i>callback_data</i>);</b>
<br>
<br>
@ -1296,7 +1314,7 @@ patterns to be analyzed, and for one-off matches and simple patterns the
benefit of faster execution might be offset by a much slower compilation time.
Most, but not all patterns can be optimized by the JIT compiler.
<a name="localesupport"></a></P>
<br><a name="SEC18" href="#TOC1">LOCALE SUPPORT</a><br>
<br><a name="SEC19" href="#TOC1">LOCALE SUPPORT</a><br>
<P>
PCRE2 handles caseless matching, and determines whether characters are letters,
digits, or whatever, by reference to a set of tables, indexed by character code
@ -1353,7 +1371,7 @@ is saved with the compiled pattern, and the same tables are used by
compilation, and matching all happen in the same locale, but different patterns
can be processed in different locales.
<a name="infoaboutpattern"></a></P>
<br><a name="SEC19" href="#TOC1">INFORMATION ABOUT A COMPILED PATTERN</a><br>
<br><a name="SEC20" href="#TOC1">INFORMATION ABOUT A COMPILED PATTERN</a><br>
<P>
<b>int pcre2_pattern_info(const pcre2 *<i>code</i>, uint32_t <i>what</i>, void *<i>where</i>);</b>
</P>
@ -1640,13 +1658,13 @@ getting memory in which to place the compiled data is the value returned by
this option plus the size of the <b>pcre2_code</b> structure. Processing a
pattern with the JIT compiler does not alter the value returned by this option.
<a name="matchdatablock"></a></P>
<br><a name="SEC20" href="#TOC1">THE MATCH DATA BLOCK</a><br>
<br><a name="SEC21" href="#TOC1">THE MATCH DATA BLOCK</a><br>
<P>
<b>pcre2_match_data_create(uint32_t <i>ovecsize</i>,</b>
<b> pcre2_general_context *<i>gcontext</i>);</b>
<br>
<br>
<b>pcre2_match_data_create_from_pattern(pcre2_code *<i>code</i>,</b>
<b>pcre2_match_data_create_from_pattern(const pcre2_code *<i>code</i>,</b>
<b> pcre2_general_context *<i>gcontext</i>);</b>
<br>
<br>
@ -1690,7 +1708,7 @@ and
<a href="#matchotherdata">other match data</a>
below.
</P>
<br><a name="SEC21" href="#TOC1">MATCHING A PATTERN: THE TRADITIONAL FUNCTION</a><br>
<br><a name="SEC22" href="#TOC1">MATCHING A PATTERN: THE TRADITIONAL FUNCTION</a><br>
<P>
<b>int pcre2_match(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
@ -1902,7 +1920,7 @@ examples, in the
<a href="pcre2partial.html"><b>pcre2partial</b></a>
documentation.
</P>
<br><a name="SEC22" href="#TOC1">NEWLINE HANDLING WHEN MATCHING</a><br>
<br><a name="SEC23" href="#TOC1">NEWLINE HANDLING WHEN MATCHING</a><br>
<P>
When PCRE2 is built, a default newline convention is set; this is usually the
standard convention for the operating system. The default can be overridden in
@ -1940,7 +1958,7 @@ the characters that it matches).
Notwithstanding the above, anomalous effects may still occur when CRLF is a
valid newline sequence and explicit \r or \n escapes appear in the pattern.
<a name="matchedstrings"></a></P>
<br><a name="SEC23" href="#TOC1">HOW PCRE2_MATCH() RETURNS A STRING AND CAPTURED SUBSTRINGS</a><br>
<br><a name="SEC24" href="#TOC1">HOW PCRE2_MATCH() RETURNS A STRING AND CAPTURED SUBSTRINGS</a><br>
<P>
<b>uint32_t pcre2_get_ovector_count(pcre2_match_data *<i>match_data</i>);</b>
<br>
@ -2167,7 +2185,7 @@ time.
</pre>
The internal recursion limit was reached.
<a name="extractbynumber"></a></P>
<br><a name="SEC24" href="#TOC1">EXTRACTING CAPTURED SUBSTRINGS BY NUMBER</a><br>
<br><a name="SEC25" href="#TOC1">EXTRACTING CAPTURED SUBSTRINGS BY NUMBER</a><br>
<P>
<b>int pcre2_substring_length_bynumber(pcre2_match_data *<i>match_data</i>,</b>
<b> unsigned int <i>number</i>, PCRE2_SIZE *<i>length</i>);</b>
@ -2239,7 +2257,7 @@ no capturing group of that number in the pattern, or because the group with
that number did not participate in the match, or because the ovector was too
small to capture that group.
</P>
<br><a name="SEC25" href="#TOC1">EXTRACTING A LIST OF ALL CAPTURED SUBSTRINGS</a><br>
<br><a name="SEC26" href="#TOC1">EXTRACTING A LIST OF ALL CAPTURED SUBSTRINGS</a><br>
<P>
<b>int pcre2_substring_list_get(pcre2_match_data *<i>match_data</i>,</b>
<b>" PCRE2_UCHAR ***<i>listptr</i>, PCRE2_SIZE **<i>lengthsptr</i>);</b>
@ -2273,7 +2291,7 @@ can be distinguished from a genuine zero-length substring by inspecting the
appropriate offset in the ovector, which contains PCRE2_UNSET for unset
substrings.
<a name="extractbynname"></a></P>
<br><a name="SEC26" href="#TOC1">EXTRACTING CAPTURED SUBSTRINGS BY NAME</a><br>
<br><a name="SEC27" href="#TOC1">EXTRACTING CAPTURED SUBSTRINGS BY NAME</a><br>
<P>
<b>int pcre2_substring_number_from_name(const pcre2_code *<i>code</i>,</b>
<b> PCRE2_SPTR <i>name</i>);</b>
@ -2326,7 +2344,67 @@ names are not included in the compiled code. The matching process uses only
numbers. For this reason, the use of different names for subpatterns of the
same number causes an error at compile time.
</P>
<br><a name="SEC27" href="#TOC1">DUPLICATE SUBPATTERN NAMES</a><br>
<br><a name="SEC28" href="#TOC1">CREATING A NEW STRING WITH SUBSTITUTIONS</a><br>
<P>
<b>int pcre2_substitute(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
<b> uint32_t <i>options</i>, pcre2_match_data *<i>match_data</i>,</b>
<b> pcre2_match_context *<i>mcontext</i>, PCRE2_SPTR \fIreplacementzfP,</b>
<b> PCRE2_SIZE <i>rlength</i>, PCRE2_UCHAR *\fIoutputbuffer\zfP,</b>
<b> PCRE2_SIZE *<i>outlengthptr</i>);</b>
This function calls <b>pcre2_match()</b> and then makes a copy of the subject
string in <i>outputbuffer</i>, replacing the part that was matched with the
<i>replacement</i> string, whose length is supplied in <b>rlength</b>. This can
be given as PCRE2_ZERO_TERMINATED for a zero-terminated string.
</P>
<P>
In the replacement string, which is interpreted as a UTF string in UTF mode, a
dollar character is an escape character that can specify the insertion of
characters from capturing groups in the pattern. The following forms are
recognized:
<pre>
$$ insert a dollar character
$&#60;n&#62; insert the contents of group &#60;n&#62;
${&#60;n&#62;} insert the contents of group &#60;n&#62;
</pre>
Either a group number or a group name can be given for &#60;n&#62;. Curly brackets are
required only if the following character would be interpreted as part of the
number or name. The number may be zero to include the entire matched string.
For example, if the pattern a(b)c is matched with "[abc]" and the replacement
string "+$1$0$1+", the result is "[+babcb+]". Group insertion is done by
calling <b>pcre2_copy_byname()</b> or <b>pcre2_copy_bynumber()</b> as
appropriate.
</P>
<P>
The first seven arguments of <b>pcre2_substitute()</b> are the same as for
<b>pcre2_match()</b>, except that the partial matching options are not
permitted, and <i>match_data</i> may be passed as NULL, in which case a match
data block is obtained and freed within this function, using memory management
functions from the match context, if provided, or else those that were used to
allocate memory for the compiled code.
</P>
<P>
There is one additional option, PCRE2_SUBSTITUTE_GLOBAL, which causes the
function to iterate over the subject string, replacing every matching
substring. If this is not set, only the first matching substring is replaced.
</P>
<P>
The <i>outlengthptr</i> argument must point to a variable that contains the
length, in code units, of the output buffer. It is updated to contain the
length of the new string, excluding the trailing zero that is automatically
added.
</P>
<P>
The function returns the number of replacements that were made. This may be
zero if no matches were found, and is never greater than 1 unless
PCRE2_SUBSTITUTE_GLOBAL is set. In the event of an error, a negative error code
is returned. Except for PCRE2_ERROR_NOMATCH (which is never returned), any
errors from <b>pcre2_match()</b> or the substring copying functions are passed
straight back. PCRE2_ERROR_BADREPLACEMENT is returned for an invalid
replacement string (unrecognized sequence following a dollar sign), and
PCRE2_ERROR_NOMEMORY is returned if the output buffer is not big enough.
</P>
<br><a name="SEC29" href="#TOC1">DUPLICATE SUBPATTERN NAMES</a><br>
<P>
<b>int pcre2_substring_nametable_scan(const pcre2_code *<i>code</i>,</b>
<b> PCRE2_SPTR <i>name</i>, PCRE2_SPTR *<i>first</i>, PCRE2_SPTR *<i>last</i>);</b>
@ -2369,7 +2447,7 @@ The format of the name table is described above in the section entitled
Given all the relevant entries for the name, you can extract each of their
numbers, and hence the captured data.
</P>
<br><a name="SEC28" href="#TOC1">FINDING ALL POSSIBLE MATCHES</a><br>
<br><a name="SEC30" href="#TOC1">FINDING ALL POSSIBLE MATCHES</a><br>
<P>
The traditional matching function uses a similar algorithm to Perl, which stops
when it finds the first match, starting at a given point in the subject. If you
@ -2387,7 +2465,7 @@ substring. Then return 1, which forces <b>pcre2_match()</b> to backtrack and try
other alternatives. Ultimately, when it runs out of matches,
<b>pcre2_match()</b> will yield PCRE2_ERROR_NOMATCH.
<a name="dfamatch"></a></P>
<br><a name="SEC29" href="#TOC1">MATCHING A PATTERN: THE ALTERNATIVE FUNCTION</a><br>
<br><a name="SEC31" href="#TOC1">MATCHING A PATTERN: THE ALTERNATIVE FUNCTION</a><br>
<P>
<b>int pcre2_dfa_match(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
@ -2562,13 +2640,13 @@ some plausibility checks are made on the contents of the workspace, which
should contain data about the previous partial match. If any of these checks
fail, this error is given.
</P>
<br><a name="SEC30" href="#TOC1">SEE ALSO</a><br>
<br><a name="SEC32" href="#TOC1">SEE ALSO</a><br>
<P>
<b>pcre2build</b>(3), <b>pcre2libs</b>(3), <b>pcre2callout</b>(3),
<b>pcre2matching</b>(3), <b>pcre2partial</b>(3), <b>pcre2posix</b>(3),
<b>pcre2demo(3)</b>, <b>pcre2sample</b>(3), <b>pcre2stack</b>(3).
</P>
<br><a name="SEC31" href="#TOC1">AUTHOR</a><br>
<br><a name="SEC33" href="#TOC1">AUTHOR</a><br>
<P>
Philip Hazel
<br>
@ -2577,9 +2655,9 @@ University Computing Service
Cambridge CB2 3QH, England.
<br>
</P>
<br><a name="SEC32" href="#TOC1">REVISION</a><br>
<br><a name="SEC34" href="#TOC1">REVISION</a><br>
<P>
Last updated: 03 November 2014
Last updated: 11 November 2014
<br>
Copyright &copy; 1997-2014 University of Cambridge.
<br>

90
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View File

@ -178,19 +178,20 @@ pattern.
The <b>pcre2_jit_stack_assign()</b> function specifies which stack JIT code
should use. Its arguments are as follows:
<pre>
pcre2_code *code
pcre2_jit_callback callback
void *data
pcre2_match_context *mcontext
pcre2_jit_callback callback
void *data
</pre>
The <i>code</i> argument is a pointer to a compiled pattern, after it has been
processed by <b>pcre2_jit_compile()</b>. There are three cases for the values of
the other two options:
The first argument is a pointer to a match context. When this is subsequently
passed to a matching function, its information determines which JIT stack is
used. There are three cases for the values of the other two options:
<pre>
(1) If <i>callback</i> is NULL and <i>data</i> is NULL, an internal 32K block
on the machine stack is used.
(2) If <i>callback</i> is NULL and <i>data</i> is not NULL, <i>data</i> must be
a valid JIT stack, the result of calling <b>pcre2_jit_stack_create()</b>.
a pointer to a valid JIT stack, the result of calling
<b>pcre2_jit_stack_create()</b>.
(3) If <i>callback</i> is not NULL, it must point to a function that is
called with <i>data</i> as an argument at the start of matching, in
@ -215,11 +216,11 @@ each thread so that the application is thread-safe.
</P>
<P>
Strictly speaking, even more is allowed. You can assign the same non-NULL stack
to any number of patterns as long as they are not used for matching by multiple
threads at the same time. For example, you can assign the same stack to all
compiled patterns, and use a global mutex in the callback to wait until the
stack is available for use. However, this is an inefficient solution, and not
recommended.
to a match context that is used by any number of patterns, as long as they are
not used for matching by multiple threads at the same time. For example, you
could use the same stack in all compiled patterns, with a global mutex in the
callback to wait until the stack is available for use. However, this is an
inefficient solution, and not recommended.
</P>
<P>
This is a suggestion for how a multithreaded program that needs to set up
@ -234,10 +235,7 @@ non-default JIT stacks might operate:
Use a one-line callback function
return thread_local_var
</pre>
All the functions described in this section do nothing if JIT is not available,
and <b>pcre2_jit_stack_assign()</b> does nothing unless the <b>code</b> argument
is non-NULL and points to a <b>pcre2_code</b> block that has been successfully
processed by <b>pcre2_jit_compile()</b>.
All the functions described in this section do nothing if JIT is not available.
<a name="stackfaq"></a></P>
<br><a name="SEC7" href="#TOC1">JIT STACK FAQ</a><br>
<P>
@ -267,26 +265,26 @@ grow up to 1M anytime if needed.
<br>
<br>
The owner of the stack is the user program, not the JIT studied pattern or
anything else. The user program must ensure that if a stack is used by
<b>pcre2_match()</b>, (that is, it is assigned to the pattern currently
running), that stack must not be used by any other threads (to avoid
overwriting the same memory area). The best practice for multithreaded programs
is to allocate a stack for each thread, and return this stack through the JIT
callback function.
anything else. The user program must ensure that if a stack is being used by
<b>pcre2_match()</b>, (that is, it is assigned to a match context that is passed
to the pattern currently running), that stack must not be used by any other
threads (to avoid overwriting the same memory area). The best practice for
multithreaded programs is to allocate a stack for each thread, and return this
stack through the JIT callback function.
</P>
<P>
(4) When should a JIT stack be freed?
<br>
<br>
You can free a JIT stack at any time, as long as it will not be used by
<b>pcre2_match()</b> again. When you assign the stack to a pattern, only a
<b>pcre2_match()</b> again. When you assign the stack to a match context, only a
pointer is set. There is no reference counting or any other magic. You can free
the patterns and stacks in any order, anytime. Just <i>do not</i> call
<b>pcre2_match()</b> with a pattern pointing to an already freed stack, as that
will cause SEGFAULT. (Also, do not free a stack currently used by
<b>pcre2_match()</b> in another thread). You can also replace the stack for a
pattern at any time. You can even free the previous stack before assigning a
replacement.
compiled patterns, contexts, and stacks in any order, anytime. Just \fIdo
not\fP call <b>pcre2_match()</b> with a match context pointing to an already
freed stack, as that will cause SEGFAULT. (Also, do not free a stack currently
used by <b>pcre2_match()</b> in another thread). You can also replace the stack
in a context at any time when it is not in use. You can also free the previous
stack before assigning a replacement.
</P>
<P>
(5) Should I allocate/free a stack every time before/after calling
@ -296,7 +294,7 @@ replacement.
No, because this is too costly in terms of resources. However, you could
implement some clever idea which release the stack if it is not used in let's
say two minutes. The JIT callback can help to achieve this without keeping a
list of the currently JIT studied patterns.
list of patterns.
</P>
<P>
(6) OK, the stack is for long term memory allocation. But what happens if a
@ -333,25 +331,28 @@ memory management, or NULL for standard memory management.
<br><a name="SEC9" href="#TOC1">EXAMPLE CODE</a><br>
<P>
This is a single-threaded example that specifies a JIT stack without using a
callback.
callback. A real program should include error checking after all the function
calls.
<pre>
int rc;
pcre2_code *re;
pcre2_match_data *match_data;
pcre2_match_context *mcontext;
pcre2_jit_stack *jit_stack;
re = pcre2_compile(pattern, PCRE2_ZERO_TERMINATED, 0,
&errornumber, &erroffset, NULL);
/* Check for errors */
rc = pcre2_jit_compile(re, PCRE2_JIT_COMPLETE);
/* Check for errors */
mcontext = pcre2_match_context_create(NULL);
jit_stack = pcre2_jit_stack_create(NULL, 32*1024, 512*1024);
/* Check for error (NULL) */
pcre2_jit_stack_assign(re, NULL, jit_stack);
pcre2_jit_stack_assign(mcontext, NULL, jit_stack);
match_data = pcre2_match_data_create(re, 10);
rc = pcre2_match(re, subject, length, 0, 0, match_data, NULL);
/* Check results */
pcre2_free(re);
rc = pcre2_match(re, subject, length, 0, 0, match_data, mcontext);
/* Process result */
pcre2_code_free(re);
pcre2_match_data_free(match_data);
pcre2_match_context_free(mcontext);
pcre2_jit_stack_free(jit_stack);
</PRE>
@ -369,13 +370,10 @@ processed by <b>pcre2_jit_compile()</b>).
</P>
<P>
The fast path function is called <b>pcre2_jit_match()</b>, and it takes exactly
the same arguments as <b>pcre2_match()</b>, plus one additional argument that
must either point to a JIT stack or be NULL. In the latter case, if a callback
function has been set up by <b>pcre2_jit_stack_assign()</b>, it is called.
Otherwise the system stack is used. The return values are the same as for
<b>pcre2_match()</b>, plus PCRE2_ERROR_JIT_BADOPTION if a matching mode (partial
or complete) is requested that was not compiled. Unsupported option bits (for
example, PCRE2_ANCHORED) are ignored.
the same arguments as <b>pcre2_match()</b>. The return values are also the same,
plus PCRE2_ERROR_JIT_BADOPTION if a matching mode (partial or complete) is
requested that was not compiled. Unsupported option bits (for example,
PCRE2_ANCHORED) are ignored.
</P>
<P>
When you call <b>pcre2_match()</b>, as well as testing for invalid options, a
@ -404,7 +402,7 @@ Cambridge CB2 3QH, England.
</P>
<br><a name="SEC13" href="#TOC1">REVISION</a><br>
<P>
Last updated: 03 November 2014
Last updated: 08 November 2014
<br>
Copyright &copy; 1997-2014 University of Cambridge.
<br>

31
doc/html/pcre2test.html
View File

@ -488,7 +488,6 @@ about the pattern:
posix use the POSIX API
stackguard=&#60;number&#62; test the stackguard feature
tables=[0|1|2] select internal tables
use_length use the pattern's length
</pre>
The effects of these modifiers are described in the following sections.
FIXME: Give more examples.
@ -542,15 +541,10 @@ pairs. For example:
/ab 32 59/hex
</pre>
This feature is provided as a way of creating patterns that contain binary zero
characters. When <b>hex</b> is set, it implies <b>use_length</b>.
</P>
<br><b>
Using the pattern's length
</b><br>
<P>
By default, <b>pcre2test</b> passes patterns as zero-terminated strings to
<b>pcre2_compile()</b>, giving the length as -1. If <b>use_length</b> is set, the
length of the pattern is passed. This is implied if <b>hex</b> is set.
characters. By default, <b>pcre2test</b> passes patterns as zero-terminated
strings to <b>pcre2_compile()</b>, giving the length as PCRE2_ZERO_TERMINATED.
However, for patterns specified in hexadecimal, the length of the pattern is
passed.
</P>
<br><b>
JIT compilation
@ -766,6 +760,7 @@ pattern.
ovector=&#60;n&#62; set size of output vector
recursion_limit=&#60;n&#62; set a recursion limit
startchar show startchar when relevant
zero_terminate pass the subject as zero-terminated
</pre>
The effects of these modifiers are described in the following sections.
FIXME: Give more examples.
@ -979,6 +974,20 @@ match block of exactly the right size for the pattern. (It is not possible to
create a match block with a zero-length ovector; there is always one pair of
offsets.)
</P>
<br><b>
Passing the subject as zero-terminated
</b><br>
<P>
By default, the subject string is passed to a native API matching function with
its correct length. In order to test the facility for passing a zero-terminated
string, the <b>zero_terminate</b> modifier is provided. It causes the length to
be passed as PCRE2_ZERO_TERMINATED. (When matching via the POSIX interface,
this modifier has no effect, as there is no facility for passing a length.)
</P>
<P>
When testing <b>pcre2_substitute</b>, this modifier also has the effect of
passing the replacement string as zero-terminated.
</P>
<br><a name="SEC12" href="#TOC1">THE ALTERNATIVE MATCHING FUNCTION</a><br>
<P>
By default, <b>pcre2test</b> uses the standard PCRE2 matching function,
@ -1224,7 +1233,7 @@ Cambridge CB2 3QH, England.
</P>
<br><a name="SEC20" href="#TOC1">REVISION</a><br>
<P>
Last updated: 02 November 2014
Last updated: 09 November 2014
<br>
Copyright &copy; 1997-2014 University of Cambridge.
<br>

4
doc/index.html.src
View File

@ -204,6 +204,10 @@ in the library.
<tr><td><a href="pcre2_set_recursion_memory_management.html">pcre2_set_recursion_memory_management</a></td>
<td>&nbsp;&nbsp;Set match recursion memory management</td></tr>
<tr><td><a href="pcre2_substitute.html">pcre2_substitute</a></td>
<td>&nbsp;&nbsp;Match a compiled pattern to a subject string and do
substitutions</td></tr>
<tr><td><a href="pcre2_substring_copy_byname.html">pcre2_substring_copy_byname</a></td>
<td>&nbsp;&nbsp;Extract named substring into given buffer</td></tr>

459
doc/pcre2.txt
View File

@ -186,7 +186,7 @@ PCRE2 NATIVE API BASIC FUNCTIONS
pcre2_match_data_create(uint32_t ovecsize,
pcre2_general_context *gcontext);
pcre2_match_data_create_from_pattern(pcre2_code *code,
pcre2_match_data_create_from_pattern(const pcre2_code *code,
pcre2_general_context *gcontext);
int pcre2_match(const pcre2_code *code, PCRE2_SPTR subject,
@ -314,6 +314,16 @@ PCRE2 NATIVE API STRING EXTRACTION FUNCTIONS
PCRE2_UCHAR ***listptr, PCRE2_SIZE **lengthsptr);
PCRE2 NATIVE API STRING SUBSTITUTION FUNCTION
int pcre2_substitute(const pcre2_code *code, PCRE2_SPTR subject,
PCRE2_SIZE length, PCRE2_SIZE startoffset,
uint32_t options, pcre2_match_data *match_data,
pcre2_match_context *mcontext, PCRE2_SPTR replacementzfP,
PCRE2_SIZE rlength, PCRE2_UCHAR *outputbuffer,
PCRE2_SIZE *outlengthptr);
PCRE2 NATIVE API JIT FUNCTIONS
int pcre2_jit_compile(pcre2_code *code, uint32_t options);
@ -321,14 +331,14 @@ PCRE2 NATIVE API JIT FUNCTIONS
int pcre2_jit_match(const pcre2_code *code, PCRE2_SPTR subject,
PCRE2_SIZE length, PCRE2_SIZE startoffset,
uint32_t options, pcre2_match_data *match_data,
pcre2_match_context *mcontext, pcre2_jit_stack *jit_stack);
pcre2_match_context *mcontext);
void pcre2_jit_free_unused_memory(pcre2_general_context *gcontext);
pcre2_jit_stack *pcre2_jit_stack_create(pcre2_general_context *gcontext,
PCRE2_SIZE startsize, PCRE2_SIZE maxsize);
void pcre2_jit_stack_assign(const pcre2_code *code,
void pcre2_jit_stack_assign(pcre2_match_context *mcontext,
pcre2_jit_callback callback_function, void *callback_data);
void pcre2_jit_stack_free(pcre2_jit_stack *jit_stack);
@ -459,7 +469,7 @@ PCRE2 API OVERVIEW
In addition to the main compiling and matching functions, there are
convenience functions for extracting captured substrings from a subject
string that is matched by pcre2_match(). They are:
string that has been matched by pcre2_match(). They are:
pcre2_substring_copy_byname()
pcre2_substring_copy_bynumber()
@ -474,9 +484,13 @@ PCRE2 API OVERVIEW
pcre2_substring_free() and pcre2_substring_list_free() are also pro-
vided, to free the memory used for extracted strings.
There are functions for finding out information about a compiled pat-
tern (pcre2_pattern_info()) and about the configuration with which
PCRE2 was built (pcre2_config()).
The function pcre2_substitute() can be called to match a pattern and
return a copy of the subject string with substitutions for parts that
were matched.
Finally, there are functions for finding out information about a com-
piled pattern (pcre2_pattern_info()) and about the configuration with
which PCRE2 was built (pcre2_config()).
NEWLINES
@ -862,33 +876,34 @@ CHECKING BUILD-TIME OPTIONS
contains the name of the architecture for which the JIT compiler is
configured, for example "x86 32bit (little endian + unaligned)". If JIT
support is not available, PCRE2_ERROR_BADOPTION is returned, otherwise
the length of the string, in code units, is returned.
the number of code units used is returned. This is the length of the
string, plus one unit for the terminating zero.
PCRE2_CONFIG_LINKSIZE
The output is an integer that contains the number of bytes used for
The output is an integer that contains the number of bytes used for
internal linkage in compiled regular expressions. When PCRE2 is config-
ured, the value can be set to 2, 3, or 4, with the default being 2.
ured, the value can be set to 2, 3, or 4, with the default being 2.
This is the value that is returned by pcre2_config(). However, when the
16-bit library is compiled, a value of 3 is rounded up to 4, and when
the 32-bit library is compiled, internal linkages always use 4 bytes,
16-bit library is compiled, a value of 3 is rounded up to 4, and when
the 32-bit library is compiled, internal linkages always use 4 bytes,
so the configured value is not relevant.
The default value of 2 for the 8-bit and 16-bit libraries is sufficient
for all but the most massive patterns, since it allows the size of the
for all but the most massive patterns, since it allows the size of the
compiled pattern to be up to 64K code units. Larger values allow larger
regular expressions to be compiled by those two libraries, but at the
regular expressions to be compiled by those two libraries, but at the
expense of slower matching.
PCRE2_CONFIG_MATCHLIMIT
The output is an unsigned long integer that gives the default limit for
the number of internal matching function calls in a pcre2_match() exe-
the number of internal matching function calls in a pcre2_match() exe-
cution. Further details are given with pcre2_match() below.
PCRE2_CONFIG_NEWLINE
The output is an integer whose value specifies the default character
The output is an integer whose value specifies the default character
sequence that is recognized as meaning "newline". The values are:
1 Carriage return (CR)
@ -897,57 +912,58 @@ CHECKING BUILD-TIME OPTIONS
4 Any Unicode line ending
5 Any of CR, LF, or CRLF
The default should normally correspond to the standard sequence for
The default should normally correspond to the standard sequence for
your operating system.
PCRE2_CONFIG_PARENSLIMIT
The output is an unsigned long integer that gives the maximum depth of
nesting of parentheses (of any kind) in a pattern. This limit is
imposed to cap the amount of system stack used when a pattern is com-
piled. It is specified when PCRE2 is built; the default is 250. This
limit does not take into account the stack that may already be used by
the calling application. For finer control over compilation stack
The output is an unsigned long integer that gives the maximum depth of
nesting of parentheses (of any kind) in a pattern. This limit is
imposed to cap the amount of system stack used when a pattern is com-
piled. It is specified when PCRE2 is built; the default is 250. This
limit does not take into account the stack that may already be used by
the calling application. For finer control over compilation stack
usage, see pcre2_set_compile_recursion_guard().
PCRE2_CONFIG_RECURSIONLIMIT
The output is an unsigned long integer that gives the default limit for
the depth of recursion when calling the internal matching function in a
pcre2_match() execution. Further details are given with pcre2_match()
pcre2_match() execution. Further details are given with pcre2_match()
below.
PCRE2_CONFIG_STACKRECURSE
The output is an integer that is set to one if internal recursion when
running pcre2_match() is implemented by recursive function calls that
use the system stack to remember their state. This is the usual way
The output is an integer that is set to one if internal recursion when
running pcre2_match() is implemented by recursive function calls that
use the system stack to remember their state. This is the usual way
that PCRE2 is compiled. The output is zero if PCRE2 was compiled to use
blocks of data on the heap instead of recursive function calls.
PCRE2_CONFIG_UNICODE_VERSION
The where argument should point to a buffer that is at least 24 code
The where argument should point to a buffer that is at least 24 code
units long. (The exact length needed can be found by calling pcre2_con-
fig() with where set to NULL.) If PCRE2 has been compiled without Uni-
code support, the buffer is filled with the text "Unicode not sup-
ported". Otherwise, the Unicode version string (for example, "7.0.0")
is inserted. The string is zero-terminated. The function returns the
length of the string in code units.
fig() with where set to NULL.) If PCRE2 has been compiled without Uni-
code support, the buffer is filled with the text "Unicode not sup-
ported". Otherwise, the Unicode version string (for example, "7.0.0")
is inserted. The number of code units used is returned. This is the
length of the string plus one unit for the terminating zero.
PCRE2_CONFIG_UNICODE
The output is an integer that is set to one if Unicode support is
available; otherwise it is set to zero. Unicode support implies UTF
The output is an integer that is set to one if Unicode support is
available; otherwise it is set to zero. Unicode support implies UTF
support.
PCRE2_CONFIG_VERSION
The where argument should point to a buffer that is at least 12 code
The where argument should point to a buffer that is at least 12 code
units long. (The exact length needed can be found by calling pcre2_con-
fig() with where set to NULL.) The buffer is filled with the PCRE2 ver-
sion string, zero-terminated. The length of the string (in code units)
is returned.
sion string, zero-terminated. The number of code units used is
returned. This is the length of the string plus one unit for the termi-
nating zero.
COMPILING A PATTERN
@ -1300,14 +1316,14 @@ JUST-IN-TIME (JIT) COMPILATION
int pcre2_jit_match(const pcre2_code *code, PCRE2_SPTR subject,
PCRE2_SIZE length, PCRE2_SIZE startoffset,
uint32_t options, pcre2_match_data *match_data,
pcre2_match_context *mcontext, pcre2_jit_stack *jit_stack);
pcre2_match_context *mcontext);
void pcre2_jit_free_unused_memory(pcre2_general_context *gcontext);
pcre2_jit_stack *pcre2_jit_stack_create(pcre2_general_context *gcontext,
PCRE2_SIZE startsize, PCRE2_SIZE maxsize);
void pcre2_jit_stack_assign(const pcre2_code *code,
void pcre2_jit_stack_assign(pcre2_match_context *mcontext,
pcre2_jit_callback callback_function, void *callback_data);
void pcre2_jit_stack_free(pcre2_jit_stack *jit_stack);
@ -1674,7 +1690,7 @@ THE MATCH DATA BLOCK
pcre2_match_data_create(uint32_t ovecsize,
pcre2_general_context *gcontext);
pcre2_match_data_create_from_pattern(pcre2_code *code,
pcre2_match_data_create_from_pattern(const pcre2_code *code,
pcre2_general_context *gcontext);
void pcre2_match_data_free(pcre2_match_data *match_data);
@ -2290,59 +2306,117 @@ EXTRACTING CAPTURED SUBSTRINGS BY NAME
causes an error at compile time.
CREATING A NEW STRING WITH SUBSTITUTIONS
int pcre2_substitute(const pcre2_code *code, PCRE2_SPTR subject,
PCRE2_SIZE length, PCRE2_SIZE startoffset,
uint32_t options, pcre2_match_data *match_data,
pcre2_match_context *mcontext, PCRE2_SPTR replacementzfP,
PCRE2_SIZE rlength, PCRE2_UCHAR *outputbufferP,
PCRE2_SIZE *outlengthptr);
This function calls pcre2_match() and then makes a copy of the subject
string in outputbuffer, replacing the part that was matched with the
replacement string, whose length is supplied in rlength. This can be
given as PCRE2_ZERO_TERMINATED for a zero-terminated string.
In the replacement string, which is interpreted as a UTF string in UTF
mode, a dollar character is an escape character that can specify the
insertion of characters from capturing groups in the pattern. The fol-
lowing forms are recognized:
$$ insert a dollar character
$<n> insert the contents of group <n>
${<n>} insert the contents of group <n>
Either a group number or a group name can be given for <n>. Curly
brackets are required only if the following character would be inter-
preted as part of the number or name. The number may be zero to include
the entire matched string. For example, if the pattern a(b)c is
matched with "[abc]" and the replacement string "+$1$0$1+", the result
is "[+babcb+]". Group insertion is done by calling pcre2_copy_byname()
or pcre2_copy_bynumber() as appropriate.
The first seven arguments of pcre2_substitute() are the same as for
pcre2_match(), except that the partial matching options are not permit-
ted, and match_data may be passed as NULL, in which case a match data
block is obtained and freed within this function, using memory manage-
ment functions from the match context, if provided, or else those that
were used to allocate memory for the compiled code.
There is one additional option, PCRE2_SUBSTITUTE_GLOBAL, which causes
the function to iterate over the subject string, replacing every match-
ing substring. If this is not set, only the first matching substring is
replaced.
The outlengthptr argument must point to a variable that contains the
length, in code units, of the output buffer. It is updated to contain
the length of the new string, excluding the trailing zero that is auto-
matically added.
The function returns the number of replacements that were made. This
may be zero if no matches were found, and is never greater than 1
unless PCRE2_SUBSTITUTE_GLOBAL is set. In the event of an error, a neg-
ative error code is returned. Except for PCRE2_ERROR_NOMATCH (which is
never returned), any errors from pcre2_match() or the substring copying
functions are passed straight back. PCRE2_ERROR_BADREPLACEMENT is
returned for an invalid replacement string (unrecognized sequence fol-
lowing a dollar sign), and PCRE2_ERROR_NOMEMORY is returned if the out-
put buffer is not big enough.
DUPLICATE SUBPATTERN NAMES
int pcre2_substring_nametable_scan(const pcre2_code *code,
PCRE2_SPTR name, PCRE2_SPTR *first, PCRE2_SPTR *last);
When a pattern is compiled with the PCRE2_DUPNAMES option, names for
subpatterns are not required to be unique. Duplicate names are always
allowed for subpatterns with the same number, created by using the (?|
feature. Indeed, if such subpatterns are named, they are required to
When a pattern is compiled with the PCRE2_DUPNAMES option, names for
subpatterns are not required to be unique. Duplicate names are always
allowed for subpatterns with the same number, created by using the (?|
feature. Indeed, if such subpatterns are named, they are required to
use the same names.
Normally, patterns with duplicate names are such that in any one match,
only one of the named subpatterns participates. An example is shown in
only one of the named subpatterns participates. An example is shown in
the pcre2pattern documentation.
When duplicates are present, pcre2_substring_copy_byname() and
pcre2_substring_get_byname() return the first substring corresponding
When duplicates are present, pcre2_substring_copy_byname() and
pcre2_substring_get_byname() return the first substring corresponding
to the given name that is set. If none are set, PCRE2_ERROR_NOSUBSTRING
is returned. The pcre2_substring_number_from_name() function returns
one of the numbers that are associated with the name, but it is not
is returned. The pcre2_substring_number_from_name() function returns
one of the numbers that are associated with the name, but it is not
defined which it is.
If you want to get full details of all captured substrings for a given
name, you must use the pcre2_substring_nametable_scan() function. The
first argument is the compiled pattern, and the second is the name. If
the third and fourth arguments are NULL, the function returns a group
If you want to get full details of all captured substrings for a given
name, you must use the pcre2_substring_nametable_scan() function. The
first argument is the compiled pattern, and the second is the name. If
the third and fourth arguments are NULL, the function returns a group
number (it is not defined which). Otherwise, the third and fourth argu-
ments must be pointers to variables that are updated by the function.
ments must be pointers to variables that are updated by the function.
After it has run, they point to the first and last entries in the name-
to-number table for the given name, and the function returns the length
of each entry. In both cases, PCRE2_ERROR_NOSUBSTRING is returned if
of each entry. In both cases, PCRE2_ERROR_NOSUBSTRING is returned if
there are no entries for the given name.
The format of the name table is described above in the section entitled
Information about a pattern above. Given all the relevant entries for
Information about a pattern above. Given all the relevant entries for
the name, you can extract each of their numbers, and hence the captured
data.
FINDING ALL POSSIBLE MATCHES
The traditional matching function uses a similar algorithm to Perl,
The traditional matching function uses a similar algorithm to Perl,
which stops when it finds the first match, starting at a given point in
the subject. If you want to find all possible matches, or the longest
possible match at a given position, consider using the alternative
matching function (see below) instead. If you cannot use the alterna-
the subject. If you want to find all possible matches, or the longest
possible match at a given position, consider using the alternative
matching function (see below) instead. If you cannot use the alterna-
tive function, you can kludge it up by making use of the callout facil-
ity, which is described in the pcre2callout documentation.
What you have to do is to insert a callout right at the end of the pat-
tern. When your callout function is called, extract and save the cur-
rent matched substring. Then return 1, which forces pcre2_match() to
backtrack and try other alternatives. Ultimately, when it runs out of
tern. When your callout function is called, extract and save the cur-
rent matched substring. Then return 1, which forces pcre2_match() to
backtrack and try other alternatives. Ultimately, when it runs out of
matches, pcre2_match() will yield PCRE2_ERROR_NOMATCH.
@ -2354,26 +2428,26 @@ MATCHING A PATTERN: THE ALTERNATIVE FUNCTION
pcre2_match_context *mcontext,
int *workspace, PCRE2_SIZE wscount);
The function pcre2_dfa_match() is called to match a subject string
against a compiled pattern, using a matching algorithm that scans the
subject string just once, and does not backtrack. This has different
characteristics to the normal algorithm, and is not compatible with
Perl. Some of the features of PCRE2 patterns are not supported. Never-
theless, there are times when this kind of matching can be useful. For
a discussion of the two matching algorithms, and a list of features
The function pcre2_dfa_match() is called to match a subject string
against a compiled pattern, using a matching algorithm that scans the
subject string just once, and does not backtrack. This has different
characteristics to the normal algorithm, and is not compatible with
Perl. Some of the features of PCRE2 patterns are not supported. Never-
theless, there are times when this kind of matching can be useful. For
a discussion of the two matching algorithms, and a list of features
that pcre2_dfa_match() does not support, see the pcre2matching documen-
tation.
The arguments for the pcre2_dfa_match() function are the same as for
The arguments for the pcre2_dfa_match() function are the same as for
pcre2_match(), plus two extras. The ovector within the match data block
is used in a different way, and this is described below. The other com-
mon arguments are used in the same way as for pcre2_match(), so their
mon arguments are used in the same way as for pcre2_match(), so their
description is not repeated here.
The two additional arguments provide workspace for the function. The
workspace vector should contain at least 20 elements. It is used for
The two additional arguments provide workspace for the function. The
workspace vector should contain at least 20 elements. It is used for
keeping track of multiple paths through the pattern tree. More
workspace is needed for patterns and subjects where there are a lot of
workspace is needed for patterns and subjects where there are a lot of
potential matches.
Here is an example of a simple call to pcre2_dfa_match():
@ -2393,45 +2467,45 @@ MATCHING A PATTERN: THE ALTERNATIVE FUNCTION
Option bits for pcre_dfa_match()
The unused bits of the options argument for pcre2_dfa_match() must be
zero. The only bits that may be set are PCRE2_ANCHORED, PCRE2_NOTBOL,
The unused bits of the options argument for pcre2_dfa_match() must be
zero. The only bits that may be set are PCRE2_ANCHORED, PCRE2_NOTBOL,
PCRE2_NOTEOL, PCRE2_NOTEMPTY, PCRE2_NOTEMPTY_ATSTART,
PCRE2_NO_UTF_CHECK, PCRE2_PARTIAL_HARD, PCRE2_PARTIAL_SOFT,
PCRE2_DFA_SHORTEST, and PCRE2_DFA_RESTART. All but the last four of
these are exactly the same as for pcre2_match(), so their description
PCRE2_DFA_SHORTEST, and PCRE2_DFA_RESTART. All but the last four of
these are exactly the same as for pcre2_match(), so their description
is not repeated here.
PCRE2_PARTIAL_HARD
PCRE2_PARTIAL_SOFT
These have the same general effect as they do for pcre2_match(), but
the details are slightly different. When PCRE2_PARTIAL_HARD is set for
pcre2_dfa_match(), it returns PCRE2_ERROR_PARTIAL if the end of the
These have the same general effect as they do for pcre2_match(), but
the details are slightly different. When PCRE2_PARTIAL_HARD is set for
pcre2_dfa_match(), it returns PCRE2_ERROR_PARTIAL if the end of the
subject is reached and there is still at least one matching possibility
that requires additional characters. This happens even if some complete
matches have already been found. When PCRE2_PARTIAL_SOFT is set, the
return code PCRE2_ERROR_NOMATCH is converted into PCRE2_ERROR_PARTIAL
if the end of the subject is reached, there have been no complete
matches have already been found. When PCRE2_PARTIAL_SOFT is set, the
return code PCRE2_ERROR_NOMATCH is converted into PCRE2_ERROR_PARTIAL
if the end of the subject is reached, there have been no complete
matches, but there is still at least one matching possibility. The por-
tion of the string that was inspected when the longest partial match
tion of the string that was inspected when the longest partial match
was found is set as the first matching string in both cases. There is a
more detailed discussion of partial and multi-segment matching, with
more detailed discussion of partial and multi-segment matching, with
examples, in the pcre2partial documentation.
PCRE2_DFA_SHORTEST
Setting the PCRE2_DFA_SHORTEST option causes the matching algorithm to
Setting the PCRE2_DFA_SHORTEST option causes the matching algorithm to
stop as soon as it has found one match. Because of the way the alterna-
tive algorithm works, this is necessarily the shortest possible match
tive algorithm works, this is necessarily the shortest possible match
at the first possible matching point in the subject string.
PCRE2_DFA_RESTART
When pcre2_dfa_match() returns a partial match, it is possible to call
When pcre2_dfa_match() returns a partial match, it is possible to call
it again, with additional subject characters, and have it continue with
the same match. The PCRE2_DFA_RESTART option requests this action; when
it is set, the workspace and wscount options must reference the same
vector as before because data about the match so far is left in them
it is set, the workspace and wscount options must reference the same
vector as before because data about the match so far is left in them
after a partial match. There is more discussion of this facility in the
pcre2partial documentation.
@ -2439,8 +2513,8 @@ MATCHING A PATTERN: THE ALTERNATIVE FUNCTION
When pcre2_dfa_match() succeeds, it may have matched more than one sub-
string in the subject. Note, however, that all the matches from one run
of the function start at the same point in the subject. The shorter
matches are all initial substrings of the longer matches. For example,
of the function start at the same point in the subject. The shorter
matches are all initial substrings of the longer matches. For example,
if the pattern
<.*>
@ -2455,66 +2529,66 @@ MATCHING A PATTERN: THE ALTERNATIVE FUNCTION
<something> <something else>
<something> <something else> <something further>
On success, the yield of the function is a number greater than zero,
which is the number of matched substrings. The offsets of the sub-
strings are returned in the ovector, and can be extracted in the same
way as for pcre2_match(). They are returned in reverse order of
length; that is, the longest matching string is given first. If there
were too many matches to fit into the ovector, the yield of the func-
On success, the yield of the function is a number greater than zero,
which is the number of matched substrings. The offsets of the sub-
strings are returned in the ovector, and can be extracted in the same
way as for pcre2_match(). They are returned in reverse order of
length; that is, the longest matching string is given first. If there
were too many matches to fit into the ovector, the yield of the func-
tion is zero, and the vector is filled with the longest matches.
NOTE: PCRE2's "auto-possessification" optimization usually applies to
character repeats at the end of a pattern (as well as internally). For
example, the pattern "a\d+" is compiled as if it were "a\d++" because
there is no point in backtracking into the repeated digits. For DFA
matching, this means that only one possible match is found. If you
really do want multiple matches in such cases, either use an ungreedy
repeat ("a\d+?") or set the PCRE2_NO_AUTO_POSSESS option when compil-
NOTE: PCRE2's "auto-possessification" optimization usually applies to
character repeats at the end of a pattern (as well as internally). For
example, the pattern "a\d+" is compiled as if it were "a\d++" because
there is no point in backtracking into the repeated digits. For DFA
matching, this means that only one possible match is found. If you
really do want multiple matches in such cases, either use an ungreedy
repeat ("a\d+?") or set the PCRE2_NO_AUTO_POSSESS option when compil-
ing.
Error returns from pcre2_dfa_match()
The pcre2_dfa_match() function returns a negative number when it fails.
Many of the errors are the same as for pcre2_match(), as described
Many of the errors are the same as for pcre2_match(), as described
above. There are in addition the following errors that are specific to
pcre2_dfa_match():
PCRE2_ERROR_DFA_UITEM
This return is given if pcre2_dfa_match() encounters an item in the
This return is given if pcre2_dfa_match() encounters an item in the
pattern that it does not support, for instance, the use of \C or a back
reference.
PCRE2_ERROR_DFA_UCOND
This return is given if pcre2_dfa_match() encounters a condition item
that uses a back reference for the condition, or a test for recursion
This return is given if pcre2_dfa_match() encounters a condition item
that uses a back reference for the condition, or a test for recursion
in a specific group. These are not supported.
PCRE2_ERROR_DFA_WSSIZE
This return is given if pcre2_dfa_match() runs out of space in the
This return is given if pcre2_dfa_match() runs out of space in the
workspace vector.
PCRE2_ERROR_DFA_RECURSE
When a recursive subpattern is processed, the matching function calls
When a recursive subpattern is processed, the matching function calls
itself recursively, using private memory for the ovector and workspace.
This error is given if the internal ovector is not large enough. This
This error is given if the internal ovector is not large enough. This
should be extremely rare, as a vector of size 1000 is used.
PCRE2_ERROR_DFA_BADRESTART
When pcre2_dfa_match() is called with the pcre2_dfa_RESTART option,
some plausibility checks are made on the contents of the workspace,
which should contain data about the previous partial match. If any of
When pcre2_dfa_match() is called with the pcre2_dfa_RESTART option,
some plausibility checks are made on the contents of the workspace,
which should contain data about the previous partial match. If any of
these checks fail, this error is given.
SEE ALSO
pcre2build(3), pcre2libs(3), pcre2callout(3), pcre2matching(3),
pcre2partial(3), pcre2posix(3), pcre2demo(3), pcre2sample(3),
pcre2build(3), pcre2libs(3), pcre2callout(3), pcre2matching(3),
pcre2partial(3), pcre2posix(3), pcre2demo(3), pcre2sample(3),
pcre2stack(3).
@ -2527,7 +2601,7 @@ AUTHOR
REVISION
Last updated: 03 November 2014
Last updated: 11 November 2014
Copyright (c) 1997-2014 University of Cambridge.
------------------------------------------------------------------------------
@ -3553,20 +3627,21 @@ CONTROLLING THE JIT STACK
The pcre2_jit_stack_assign() function specifies which stack JIT code
should use. Its arguments are as follows:
pcre2_code *code
pcre2_jit_callback callback
void *data
pcre2_match_context *mcontext
pcre2_jit_callback callback
void *data
The code argument is a pointer to a compiled pattern, after it has been
processed by pcre2_jit_compile(). There are three cases for the values
of the other two options:
The first argument is a pointer to a match context. When this is subse-
quently passed to a matching function, its information determines which
JIT stack is used. There are three cases for the values of the other
two options:
(1) If callback is NULL and data is NULL, an internal 32K block
on the machine stack is used.
(2) If callback is NULL and data is not NULL, data must be
a valid JIT stack, the result of calling pcre2_jit_stack_cre-
ate().
a pointer to a valid JIT stack, the result of calling
pcre2_jit_stack_create().
(3) If callback is not NULL, it must point to a function that is
called with data as an argument at the start of matching, in
@ -3591,13 +3666,14 @@ CONTROLLING THE JIT STACK
application is thread-safe.
Strictly speaking, even more is allowed. You can assign the same non-
NULL stack to any number of patterns as long as they are not used for
matching by multiple threads at the same time. For example, you can
assign the same stack to all compiled patterns, and use a global mutex
in the callback to wait until the stack is available for use. However,
this is an inefficient solution, and not recommended.
NULL stack to a match context that is used by any number of patterns,
as long as they are not used for matching by multiple threads at the
same time. For example, you could use the same stack in all compiled
patterns, with a global mutex in the callback to wait until the stack
is available for use. However, this is an inefficient solution, and not
recommended.
This is a suggestion for how a multithreaded program that needs to set
This is a suggestion for how a multithreaded program that needs to set
up non-default JIT stacks might operate:
During thread initalization
@ -3609,10 +3685,8 @@ CONTROLLING THE JIT STACK
Use a one-line callback function
return thread_local_var
All the functions described in this section do nothing if JIT is not
available, and pcre2_jit_stack_assign() does nothing unless the code
argument is non-NULL and points to a pcre2_code block that has been
successfully processed by pcre2_jit_compile().
All the functions described in this section do nothing if JIT is not
available.
JIT STACK FAQ
@ -3620,66 +3694,66 @@ JIT STACK FAQ
(1) Why do we need JIT stacks?
PCRE2 (and JIT) is a recursive, depth-first engine, so it needs a stack
where the local data of the current node is pushed before checking its
where the local data of the current node is pushed before checking its
child nodes. Allocating real machine stack on some platforms is diffi-
cult. For example, the stack chain needs to be updated every time if we
extend the stack on PowerPC. Although it is possible, its updating
extend the stack on PowerPC. Although it is possible, its updating
time overhead decreases performance. So we do the recursion in memory.
(2) Why don't we simply allocate blocks of memory with malloc()?
Modern operating systems have a nice feature: they can reserve an
Modern operating systems have a nice feature: they can reserve an
address space instead of allocating memory. We can safely allocate mem-
ory pages inside this address space, so the stack could grow without
ory pages inside this address space, so the stack could grow without
moving memory data (this is important because of pointers). Thus we can
allocate 1M address space, and use only a single memory page (usually
4K) if that is enough. However, we can still grow up to 1M anytime if
allocate 1M address space, and use only a single memory page (usually
4K) if that is enough. However, we can still grow up to 1M anytime if
needed.
(3) Who "owns" a JIT stack?
The owner of the stack is the user program, not the JIT studied pattern
or anything else. The user program must ensure that if a stack is used
by pcre2_match(), (that is, it is assigned to the pattern currently
running), that stack must not be used by any other threads (to avoid
overwriting the same memory area). The best practice for multithreaded
programs is to allocate a stack for each thread, and return this stack
through the JIT callback function.
or anything else. The user program must ensure that if a stack is being
used by pcre2_match(), (that is, it is assigned to a match context that
is passed to the pattern currently running), that stack must not be
used by any other threads (to avoid overwriting the same memory area).
The best practice for multithreaded programs is to allocate a stack for
each thread, and return this stack through the JIT callback function.
(4) When should a JIT stack be freed?
You can free a JIT stack at any time, as long as it will not be used by
pcre2_match() again. When you assign the stack to a pattern, only a
pointer is set. There is no reference counting or any other magic. You
can free the patterns and stacks in any order, anytime. Just do not
call pcre2_match() with a pattern pointing to an already freed stack,
as that will cause SEGFAULT. (Also, do not free a stack currently used
by pcre2_match() in another thread). You can also replace the stack for
a pattern at any time. You can even free the previous stack before
assigning a replacement.
pcre2_match() again. When you assign the stack to a match context, only
a pointer is set. There is no reference counting or any other magic.
You can free compiled patterns, contexts, and stacks in any order, any-
time. Just do not call pcre2_match() with a match context pointing to
an already freed stack, as that will cause SEGFAULT. (Also, do not free
a stack currently used by pcre2_match() in another thread). You can
also replace the stack in a context at any time when it is not in use.
You can also free the previous stack before assigning a replacement.
(5) Should I allocate/free a stack every time before/after calling
(5) Should I allocate/free a stack every time before/after calling
pcre2_match()?
No, because this is too costly in terms of resources. However, you
could implement some clever idea which release the stack if it is not
used in let's say two minutes. The JIT callback can help to achieve
this without keeping a list of the currently JIT studied patterns.
No, because this is too costly in terms of resources. However, you
could implement some clever idea which release the stack if it is not
used in let's say two minutes. The JIT callback can help to achieve
this without keeping a list of patterns.
(6) OK, the stack is for long term memory allocation. But what happens
if a pattern causes stack overflow with a stack of 1M? Is that 1M kept
(6) OK, the stack is for long term memory allocation. But what happens
if a pattern causes stack overflow with a stack of 1M? Is that 1M kept
until the stack is freed?
Especially on embedded sytems, it might be a good idea to release mem-
ory sometimes without freeing the stack. There is no API for this at
the moment. Probably a function call which returns with the currently
allocated memory for any stack and another which allows releasing mem-
Especially on embedded sytems, it might be a good idea to release mem-
ory sometimes without freeing the stack. There is no API for this at
the moment. Probably a function call which returns with the currently
allocated memory for any stack and another which allows releasing mem-
ory (shrinking the stack) would be a good idea if someone needs this.
(7) This is too much of a headache. Isn't there any better solution for
JIT stack handling?
No, thanks to Windows. If POSIX threads were used everywhere, we could
No, thanks to Windows. If POSIX threads were used everywhere, we could
throw out this complicated API.
@ -3688,36 +3762,39 @@ FREEING JIT SPECULATIVE MEMORY
void pcre2_jit_free_unused_memory(pcre2_general_context *gcontext);
The JIT executable allocator does not free all memory when it is possi-
ble. It expects new allocations, and keeps some free memory around to
improve allocation speed. However, in low memory conditions, it might
be better to free all possible memory. You can cause this to happen by
calling pcre2_jit_free_unused_memory(). Its argument is a general con-
ble. It expects new allocations, and keeps some free memory around to
improve allocation speed. However, in low memory conditions, it might
be better to free all possible memory. You can cause this to happen by
calling pcre2_jit_free_unused_memory(). Its argument is a general con-
text, for custom memory management, or NULL for standard memory manage-
ment.
EXAMPLE CODE
This is a single-threaded example that specifies a JIT stack without
using a callback.
This is a single-threaded example that specifies a JIT stack without
using a callback. A real program should include error checking after
all the function calls.
int rc;
pcre2_code *re;
pcre2_match_data *match_data;
pcre2_match_context *mcontext;
pcre2_jit_stack *jit_stack;
re = pcre2_compile(pattern, PCRE2_ZERO_TERMINATED, 0,
&errornumber, &erroffset, NULL);
/* Check for errors */
rc = pcre2_jit_compile(re, PCRE2_JIT_COMPLETE);
/* Check for errors */
mcontext = pcre2_match_context_create(NULL);
jit_stack = pcre2_jit_stack_create(NULL, 32*1024, 512*1024);
/* Check for error (NULL) */
pcre2_jit_stack_assign(re, NULL, jit_stack);
pcre2_jit_stack_assign(mcontext, NULL, jit_stack);
match_data = pcre2_match_data_create(re, 10);
rc = pcre2_match(re, subject, length, 0, 0, match_data, NULL);
/* Check results */
pcre2_free(re);
rc = pcre2_match(re, subject, length, 0, 0, match_data, mcontext);
/* Process result */
pcre2_code_free(re);
pcre2_match_data_free(match_data);
pcre2_match_context_free(mcontext);
pcre2_jit_stack_free(jit_stack);
@ -3733,14 +3810,10 @@ JIT FAST PATH API
patterns that have been successfully processed by pcre2_jit_compile()).
The fast path function is called pcre2_jit_match(), and it takes
exactly the same arguments as pcre2_match(), plus one additional argu-
ment that must either point to a JIT stack or be NULL. In the latter
case, if a callback function has been set up by
pcre2_jit_stack_assign(), it is called. Otherwise the system stack is
used. The return values are the same as for pcre2_match(), plus
PCRE2_ERROR_JIT_BADOPTION if a matching mode (partial or complete) is
requested that was not compiled. Unsupported option bits (for example,
PCRE2_ANCHORED) are ignored.
exactly the same arguments as pcre2_match(). The return values are also
the same, plus PCRE2_ERROR_JIT_BADOPTION if a matching mode (partial or
complete) is requested that was not compiled. Unsupported option bits
(for example, PCRE2_ANCHORED) are ignored.
When you call pcre2_match(), as well as testing for invalid options, a
number of other sanity checks are performed on the arguments. For exam-
@ -3767,7 +3840,7 @@ AUTHOR
REVISION
Last updated: 03 November 2014
Last updated: 08 November 2014
Copyright (c) 1997-2014 University of Cambridge.
------------------------------------------------------------------------------

2
doc/pcre2_jit_stack_assign.3
View File

@ -14,7 +14,7 @@ PCRE2 - Perl-compatible regular expressions (revised API)
.SH DESCRIPTION
.rs
.sp
This function provides control over the memory used by JIT as a run-time stack
This function provides control over the memory used by JIT as a run-time stack
when \fBpcre2_match()\fP or \fBpcre2_jit_match()\fP is called with a pattern
that has been successfully processed by the JIT compiler. The information that
determines which stack is used is put into a match context that is subsequently

73
doc/pcre2_substitute.3 Normal file
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@ -0,0 +1,73 @@
.TH PCRE2_SUBSTITUTE 3 "11 November 2014" "PCRE2 10.00"
.SH NAME
PCRE2 - Perl-compatible regular expressions (revised API)
.SH SYNOPSIS
.rs
.sp
.B #include <pcre2.h>
.PP
.nf
.B int pcre2_substitute(const pcre2_code *\fIcode\fP, PCRE2_SPTR \fIsubject\fP,
.B " PCRE2_SIZE \fIlength\fP, PCRE2_SIZE \fIstartoffset\fP,"
.B " uint32_t \fIoptions\fP, pcre2_match_data *\fImatch_data\fP,"
.B " pcre2_match_context *\fImcontext\fP, PCRE2_SPTR \fIreplacementzfP,"
.B " PCRE2_SIZE \fIrlength\fP, PCRE2_UCHAR *\fIoutputbuffer\fP,"
.B " PCRE2_SIZE *\fIoutlengthptr\fP);"
.fi
.
.SH DESCRIPTION
.rs
.sp
This function matches a compiled regular expression against a given subject
string, using a matching algorithm that is similar to Perl's. It then makes a
copy of the subject, substituting a replacement string for what was matched.
Its arguments are:
.sp
\fIcode\fP Points to the compiled pattern
\fIsubject\fP Points to the subject string
\fIlength\fP Length of the subject string
\fIstartoffset\fP Offset in the subject at which to start matching
\fIoptions\fP Option bits
\fImatch_data\fP Points to a match data block, or is NULL
\fImcontext\fP Points to a match context, or is NULL
\fIreplacement\fP Points to the replacement string
\fIrlength\fP Length of the replacement string
\fIoutputbuffer\fP Points to the output buffer
\fIoutlengthptr\fP Points to the length of the output buffer
.sp
A match context is needed only if you want to:
.sp
Set up a callout function
Change the limit for calling the internal function \fImatch()\fP
Change the limit for calling \fImatch()\fP recursively
Set custom memory management when the heap is used for recursion
.sp
The \fIlength\fP, \fIstartoffset\fP and \fIrlength\fP values are code
units, not characters, as is the contents of the variable pointed at by
\fIoutlengthptr\fP, which is updated to the actual length of the new string.
The options are:
.sp
PCRE2_ANCHORED Match only at the first position
PCRE2_NOTBOL Subject string is not the beginning of a line
PCRE2_NOTEOL Subject string is not the end of a line
PCRE2_NOTEMPTY An empty string is not a valid match
PCRE2_NOTEMPTY_ATSTART An empty string at the start of the subject
is not a valid match
PCRE2_NO_UTF_CHECK Do not check the subject or replacement for
UTF validity (only relevant if PCRE2_UTF
was set at compile time)
PCRE2_SUBSTITUTE_GLOBAL Replace all occurrences in the subject
.sp
The function returns the number of substitutions, which may be zero if there
were no matches. The result can be greater than one only when
PCRE2_SUBSTITUTE_GLOBAL is set.
.P
There is a complete description of the PCRE2 native API in the
.\" HREF
\fBpcre2api\fP
.\"
page and a description of the POSIX API in the
.\" HREF
\fBpcre2posix\fP
.\"
page.

95
doc/pcre2api.3
View File

@ -1,4 +1,4 @@
.TH PCRE2API 3 "08 November 2014" "PCRE2 10.00"
.TH PCRE2API 3 "11 November 2014" "PCRE2 10.00"
.SH NAME
PCRE2 - Perl-compatible regular expressions (revised API)
.sp
@ -169,6 +169,19 @@ document for an overview of all the PCRE2 documentation.
.fi
.
.
.SH "PCRE2 NATIVE API STRING SUBSTITUTION FUNCTION"
.rs
.sp
.nf
.B int pcre2_substitute(const pcre2_code *\fIcode\fP, PCRE2_SPTR \fIsubject\fP,
.B " PCRE2_SIZE \fIlength\fP, PCRE2_SIZE \fIstartoffset\fP,"
.B " uint32_t \fIoptions\fP, pcre2_match_data *\fImatch_data\fP,"
.B " pcre2_match_context *\fImcontext\fP, PCRE2_SPTR \fIreplacementzfP,"
.B " PCRE2_SIZE \fIrlength\fP, PCRE2_UCHAR *\fIoutputbuffer\fP,"
.B " PCRE2_SIZE *\fIoutlengthptr\fP);"
.fi
.
.
.SH "PCRE2 NATIVE API JIT FUNCTIONS"
.rs
.sp
@ -332,8 +345,8 @@ and disadvantages is given in the
documentation. There is no JIT support for \fBpcre2_dfa_match()\fP.
.P
In addition to the main compiling and matching functions, there are convenience
functions for extracting captured substrings from a subject string that is
matched by \fBpcre2_match()\fP. They are:
functions for extracting captured substrings from a subject string that has
been matched by \fBpcre2_match()\fP. They are:
.sp
\fBpcre2_substring_copy_byname()\fP
\fBpcre2_substring_copy_bynumber()\fP
@ -348,9 +361,13 @@ matched by \fBpcre2_match()\fP. They are:
\fBpcre2_substring_free()\fP and \fBpcre2_substring_list_free()\fP are also
provided, to free the memory used for extracted strings.
.P
There are functions for finding out information about a compiled pattern
(\fBpcre2_pattern_info()\fP) and about the configuration with which PCRE2 was
built (\fBpcre2_config()\fP).
The function \fBpcre2_substitute()\fP can be called to match a pattern and
return a copy of the subject string with substitutions for parts that were
matched.
.P
Finally, there are functions for finding out information about a compiled
pattern (\fBpcre2_pattern_info()\fP) and about the configuration with which
PCRE2 was built (\fBpcre2_config()\fP).
.
.
.\" HTML <a name="newlines"></a>
@ -865,8 +882,8 @@ otherwise it is set to zero. Unicode support implies UTF support.
The \fIwhere\fP argument should point to a buffer that is at least 12 code
units long. (The exact length needed can be found by calling
\fBpcre2_config()\fP with \fBwhere\fP set to NULL.) The buffer is filled with
the PCRE2 version string, zero-terminated. The number of code units used is
returned. This is the length of the string plus one unit for the terminating
the PCRE2 version string, zero-terminated. The number of code units used is
returned. This is the length of the string plus one unit for the terminating
zero.
.
.
@ -2361,6 +2378,66 @@ numbers. For this reason, the use of different names for subpatterns of the
same number causes an error at compile time.
.
.
.SH "CREATING A NEW STRING WITH SUBSTITUTIONS"
.rs
.sp
.nf
.B int pcre2_substitute(const pcre2_code *\fIcode\fP, PCRE2_SPTR \fIsubject\fP,
.B " PCRE2_SIZE \fIlength\fP, PCRE2_SIZE \fIstartoffset\fP,"
.B " uint32_t \fIoptions\fP, pcre2_match_data *\fImatch_data\fP,"
.B " pcre2_match_context *\fImcontext\fP, PCRE2_SPTR \fIreplacementzfP,"
.B " PCRE2_SIZE \fIrlength\fP, PCRE2_UCHAR *\fIoutputbuffer\zfP,"
.B " PCRE2_SIZE *\fIoutlengthptr\fP);"
.fi
This function calls \fBpcre2_match()\fP and then makes a copy of the subject
string in \fIoutputbuffer\fP, replacing the part that was matched with the
\fIreplacement\fP string, whose length is supplied in \fBrlength\fP. This can
be given as PCRE2_ZERO_TERMINATED for a zero-terminated string.
.P
In the replacement string, which is interpreted as a UTF string in UTF mode,
and is checked for UTF validity unless the PCRE2_NO_UTF_CHECK option is set, a
dollar character is an escape character that can specify the insertion of
characters from capturing groups in the pattern. The following forms are
recognized:
.sp
$$ insert a dollar character
$<n> insert the contents of group <n>
${<n>} insert the contents of group <n>
.sp
Either a group number or a group name can be given for <n>. Curly brackets are
required only if the following character would be interpreted as part of the
number or name. The number may be zero to include the entire matched string.
For example, if the pattern a(b)c is matched with "[abc]" and the replacement
string "+$1$0$1+", the result is "[+babcb+]". Group insertion is done by
calling \fBpcre2_copy_byname()\fP or \fBpcre2_copy_bynumber()\fP as
appropriate.
.P
The first seven arguments of \fBpcre2_substitute()\fP are the same as for
\fBpcre2_match()\fP, except that the partial matching options are not
permitted, and \fImatch_data\fP may be passed as NULL, in which case a match
data block is obtained and freed within this function, using memory management
functions from the match context, if provided, or else those that were used to
allocate memory for the compiled code.
.P
There is one additional option, PCRE2_SUBSTITUTE_GLOBAL, which causes the
function to iterate over the subject string, replacing every matching
substring. If this is not set, only the first matching substring is replaced.
.P
The \fIoutlengthptr\fP argument must point to a variable that contains the
length, in code units, of the output buffer. It is updated to contain the
length of the new string, excluding the trailing zero that is automatically
added.
.P
The function returns the number of replacements that were made. This may be
zero if no matches were found, and is never greater than 1 unless
PCRE2_SUBSTITUTE_GLOBAL is set. In the event of an error, a negative error code
is returned. Except for PCRE2_ERROR_NOMATCH (which is never returned), any
errors from \fBpcre2_match()\fP or the substring copying functions are passed
straight back. PCRE2_ERROR_BADREPLACEMENT is returned for an invalid
replacement string (unrecognized sequence following a dollar sign), and
PCRE2_ERROR_NOMEMORY is returned if the output buffer is not big enough.
.
.
.SH "DUPLICATE SUBPATTERN NAMES"
.rs
.sp
@ -2633,6 +2710,6 @@ Cambridge CB2 3QH, England.
.rs
.sp
.nf
Last updated: 08 November 2014
Last updated: 11 November 2014
Copyright (c) 1997-2014 University of Cambridge.
.fi

14
doc/pcre2jit.3
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@ -169,7 +169,7 @@ should use. Its arguments are as follows:
void *data
.sp
The first argument is a pointer to a match context. When this is subsequently
passed to a matching function, its information determines which JIT stack is
passed to a matching function, its information determines which JIT stack is
used. There are three cases for the values of the other two options:
.sp
(1) If \fIcallback\fP is NULL and \fIdata\fP is NULL, an internal 32K block
@ -309,27 +309,27 @@ memory management, or NULL for standard memory management.
.rs
.sp
This is a single-threaded example that specifies a JIT stack without using a
callback. A real program should include error checking after all the function
callback. A real program should include error checking after all the function
calls.
.sp
int rc;
pcre2_code *re;
pcre2_match_data *match_data;
pcre2_match_context *mcontext;
pcre2_match_context *mcontext;
pcre2_jit_stack *jit_stack;
.sp
re = pcre2_compile(pattern, PCRE2_ZERO_TERMINATED, 0,
re = pcre2_compile(pattern, PCRE2_ZERO_TERMINATED, 0,
&errornumber, &erroffset, NULL);
rc = pcre2_jit_compile(re, PCRE2_JIT_COMPLETE);
mcontext = pcre2_match_context_create(NULL);
mcontext = pcre2_match_context_create(NULL);
jit_stack = pcre2_jit_stack_create(NULL, 32*1024, 512*1024);
pcre2_jit_stack_assign(mcontext, NULL, jit_stack);
match_data = pcre2_match_data_create(re, 10);
rc = pcre2_match(re, subject, length, 0, 0, match_data, mcontext);
/* Process result */
/* Process result */
.sp
pcre2_code_free(re);
pcre2_match_data_free(match_data);
pcre2_match_data_free(match_data);
pcre2_match_context_free(mcontext);
pcre2_jit_stack_free(jit_stack);
.sp

4
doc/pcre2test.1
View File

@ -720,7 +720,7 @@ pattern.
ovector=<n> set size of output vector
recursion_limit=<n> set a recursion limit
startchar show startchar when relevant
zero_terminate pass the subject as zero-terminated
zero_terminate pass the subject as zero-terminated
.sp
The effects of these modifiers are described in the following sections.
FIXME: Give more examples.
@ -932,7 +932,7 @@ offsets.)
By default, the subject string is passed to a native API matching function with
its correct length. In order to test the facility for passing a zero-terminated
string, the \fBzero_terminate\fP modifier is provided. It causes the length to
be passed as PCRE2_ZERO_TERMINATED. (When matching via the POSIX interface,
be passed as PCRE2_ZERO_TERMINATED. (When matching via the POSIX interface,
this modifier has no effect, as there is no facility for passing a length.)
.P
When testing \fBpcre2_substitute\fP, this modifier also has the effect of

387
doc/pcre2test.txt
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@ -435,7 +435,6 @@ PATTERN MODIFIERS
posix use the POSIX API
stackguard=<number> test the stackguard feature
tables=[0|1|2] select internal tables
use_length use the pattern's length
The effects of these modifiers are described in the following sections.
FIXME: Give more examples.
@ -480,17 +479,14 @@ PATTERN MODIFIERS
/ab 32 59/hex
This feature is provided as a way of creating patterns that contain
binary zero characters. When hex is set, it implies use_length.
Using the pattern's length
By default, pcre2test passes patterns as zero-terminated strings to
pcre2_compile(), giving the length as -1. If use_length is set, the
length of the pattern is passed. This is implied if hex is set.
binary zero characters. By default, pcre2test passes patterns as zero-
terminated strings to pcre2_compile(), giving the length as
PCRE2_ZERO_TERMINATED. However, for patterns specified in hexadecimal,
the length of the pattern is passed.
JIT compilation
The /jit modifier may optionally be followed by and equals sign and a
The /jit modifier may optionally be followed by and equals sign and a
number in the range 0 to 7:
0 disable JIT
@ -501,23 +497,23 @@ PATTERN MODIFIERS
6 use JIT for soft and hard partial match
7 all three modes
If no number is given, 7 is assumed. If JIT compilation is successful,
the compiled JIT code will automatically be used when pcre2_match() is
run for the appropriate type of match, except when incompatible run-
If no number is given, 7 is assumed. If JIT compilation is successful,
the compiled JIT code will automatically be used when pcre2_match() is
run for the appropriate type of match, except when incompatible run-
time options are specified. For more details, see the pcre2jit documen-
tation. See also the jitstack modifier below for a way of setting the
tation. See also the jitstack modifier below for a way of setting the
size of the JIT stack.
If the jitfast modifier is specified, matching is done using the JIT
If the jitfast modifier is specified, matching is done using the JIT
"fast path" interface (pcre2_jit_match()), which skips some of the san-
ity checks that are done by pcre2_match(), and of course does not work
when JIT is not supported. If jitfast is specified without jit, jit=7
ity checks that are done by pcre2_match(), and of course does not work
when JIT is not supported. If jitfast is specified without jit, jit=7
is assumed.
If the jitverify modifier is specified, information about the compiled
pattern shows whether JIT compilation was or was not successful. If
jitverify is specified without jit, jit=7 is assumed. If JIT compila-
tion is successful when jitverify is set, the text "(JIT)" is added to
If the jitverify modifier is specified, information about the compiled
pattern shows whether JIT compilation was or was not successful. If
jitverify is specified without jit, jit=7 is assumed. If JIT compila-
tion is successful when jitverify is set, the text "(JIT)" is added to
the first output line after a match or non match when JIT-compiled code
was actually used.
@ -528,33 +524,33 @@ PATTERN MODIFIERS
/pattern/locale=fr_FR
The given locale is set, pcre2_maketables() is called to build a set of
character tables for the locale, and this is then passed to pcre2_com-
pile() when compiling the regular expression. The same tables are used
character tables for the locale, and this is then passed to pcre2_com-
pile() when compiling the regular expression. The same tables are used
when matching the following subject lines. The /locale modifier applies
only to the pattern on which it appears, but can be given in a #pattern
command if a default is needed. Setting a locale and alternate charac-
command if a default is needed. Setting a locale and alternate charac-
ter tables are mutually exclusive.
Showing pattern memory
The /memory modifier causes the size in bytes of the memory block used
to hold the compiled pattern to be output. This does not include the
size of the pcre2_code block; it is just the actual compiled data. If
The /memory modifier causes the size in bytes of the memory block used
to hold the compiled pattern to be output. This does not include the
size of the pcre2_code block; it is just the actual compiled data. If
the pattern is subsequently passed to the JIT compiler, the size of the
JIT compiled code is also output.
Limiting nested parentheses
The parens_nest_limit modifier sets a limit on the depth of nested
parentheses in a pattern. Breaching the limit causes a compilation
error. The default for the library is set when PCRE2 is built, but
pcre2test sets its own default of 220, which is required for running
The parens_nest_limit modifier sets a limit on the depth of nested
parentheses in a pattern. Breaching the limit causes a compilation
error. The default for the library is set when PCRE2 is built, but
pcre2test sets its own default of 220, which is required for running
the standard test suite.
Using the POSIX wrapper API
The /posix modifier causes pcre2test to call PCRE2 via the POSIX wrap-
per API rather than its native API. This supports only the 8-bit
The /posix modifier causes pcre2test to call PCRE2 via the POSIX wrap-
per API rather than its native API. This supports only the 8-bit
library. When the POSIX API is being used, the following pattern modi-
fiers set options for the regcomp() function:
@ -566,25 +562,25 @@ PATTERN MODIFIERS
ucp REG_UCP ) the POSIX standard
utf REG_UTF8 )
The aftertext and allaftertext subject modifiers work as described
The aftertext and allaftertext subject modifiers work as described
below. All other modifiers cause an error.
Testing the stack guard feature
The /stackguard modifier is used to test the use of pcre2_set_com-
pile_recursion_guard(), a function that is provided to enable stack
availability to be checked during compilation (see the pcre2api docu-
mentation for details). If the number specified by the modifier is
The /stackguard modifier is used to test the use of pcre2_set_com-
pile_recursion_guard(), a function that is provided to enable stack
availability to be checked during compilation (see the pcre2api docu-
mentation for details). If the number specified by the modifier is
greater than zero, pcre2_set_compile_recursion_guard() is called to set
up callback from pcre2_compile() to a local function. The argument it
is passed is the current nesting parenthesis depth; if this is greater
up callback from pcre2_compile() to a local function. The argument it
is passed is the current nesting parenthesis depth; if this is greater
than the value given by the modifier, non-zero is returned, causing the
compilation to be aborted.
Using alternative character tables
The /tables modifier must be followed by a single digit. It causes a
specific set of built-in character tables to be passed to pcre2_com-
The /tables modifier must be followed by a single digit. It causes a
specific set of built-in character tables to be passed to pcre2_com-
pile(). This is used in the PCRE2 tests to check behaviour with differ-
ent character tables. The digit specifies the tables as follows:
@ -593,15 +589,15 @@ PATTERN MODIFIERS
pcre2_chartables.c.dist
2 a set of tables defining ISO 8859 characters
In table 2, some characters whose codes are greater than 128 are iden-
tified as letters, digits, spaces, etc. Setting alternate character
In table 2, some characters whose codes are greater than 128 are iden-
tified as letters, digits, spaces, etc. Setting alternate character
tables and a locale are mutually exclusive.
Setting certain match controls
The following modifiers are really subject modifiers, and are described
below. However, they may be included in a pattern's modifier list, in
which case they are applied to every subject line that is processed
below. However, they may be included in a pattern's modifier list, in
which case they are applied to every subject line that is processed
with that pattern. They do not affect the compilation process.
aftertext show text after match
@ -612,7 +608,7 @@ PATTERN MODIFIERS
mark show mark values
startchar show starting character when relevant
These modifiers may not appear in a #pattern command. If you want them
These modifiers may not appear in a #pattern command. If you want them
as defaults, set them in a #subject command.
@ -623,7 +619,7 @@ SUBJECT MODIFIERS
Setting match options
The following modifiers set options for pcre2_match() or
The following modifiers set options for pcre2_match() or
pcre2_dfa_match(). See pcreapi for a description of their effects.
anchored set PCRE2_ANCHORED
@ -637,20 +633,20 @@ SUBJECT MODIFIERS
partial_hard (or ph) set PCRE2_PARTIAL_HARD
partial_soft (or ps) set PCRE2_PARTIAL_SOFT
The partial matching modifiers are provided with abbreviations because
The partial matching modifiers are provided with abbreviations because
they appear frequently in tests.
If the /posix modifier was present on the pattern, causing the POSIX
If the /posix modifier was present on the pattern, causing the POSIX
wrapper API to be used, the only option-setting modifiers that have any
effect are notbol, notempty, and noteol, causing REG_NOTBOL,
REG_NOTEMPTY, and REG_NOTEOL, respectively, to be passed to regexec().
effect are notbol, notempty, and noteol, causing REG_NOTBOL,
REG_NOTEMPTY, and REG_NOTEOL, respectively, to be passed to regexec().
Any other modifiers cause an error.
Setting match controls
The following modifiers affect the matching process or request addi-
tional information. Some of them may also be specified on a pattern
line (see above), in which case they apply to every subject line that
The following modifiers affect the matching process or request addi-
tional information. Some of them may also be specified on a pattern
line (see above), in which case they apply to every subject line that
is matched against that pattern.
aftertext show text after match
@ -676,29 +672,30 @@ SUBJECT MODIFIERS
ovector=<n> set size of output vector
recursion_limit=<n> set a recursion limit
startchar show startchar when relevant
zero_terminate pass the subject as zero-terminated
The effects of these modifiers are described in the following sections.
FIXME: Give more examples.
Showing more text
The aftertext modifier requests that as well as outputting the sub-
string that matched the entire pattern, pcre2test should in addition
output the remainder of the subject string. This is useful for tests
where the subject contains multiple copies of the same substring. The
allaftertext modifier requests the same action for captured substrings
as well as the main matched substring. In each case the remainder is
output on the following line with a plus character following the cap-
The aftertext modifier requests that as well as outputting the sub-
string that matched the entire pattern, pcre2test should in addition
output the remainder of the subject string. This is useful for tests
where the subject contains multiple copies of the same substring. The
allaftertext modifier requests the same action for captured substrings
as well as the main matched substring. In each case the remainder is
output on the following line with a plus character following the cap-
ture number.
The allusedtext modifier requests that all the text that was consulted
during a successful pattern match by the interpreter should be shown.
This feature is not supported for JIT matching, and if requested with
JIT it is ignored (with a warning message). Setting this modifier
The allusedtext modifier requests that all the text that was consulted
during a successful pattern match by the interpreter should be shown.
This feature is not supported for JIT matching, and if requested with
JIT it is ignored (with a warning message). Setting this modifier
affects the output if there is a lookbehind at the start of a match, or
a lookahead at the end, or if \K is used in the pattern. Characters
that precede or follow the start and end of the actual match are indi-
cated in the output by '<' or '>' characters underneath them. Here is
a lookahead at the end, or if \K is used in the pattern. Characters
that precede or follow the start and end of the actual match are indi-
cated in the output by '<' or '>' characters underneath them. Here is
an example:
re> /(?<=pqr)abc(?=xyz)/
@ -706,15 +703,15 @@ SUBJECT MODIFIERS
0: pqrabcxyz
<<< >>>
This shows that the matched string is "abc", with the preceding and
This shows that the matched string is "abc", with the preceding and
following strings "pqr" and "xyz" also consulted during the match.
The startchar modifier requests that the starting character for the
match be indicated, if it is different to the start of the matched
The startchar modifier requests that the starting character for the
match be indicated, if it is different to the start of the matched
string. The only time when this occurs is when \K has been processed as
part of the match. In this situation, the output for the matched string
is displayed from the starting character instead of from the match
point, with circumflex characters under the earlier characters. For
is displayed from the starting character instead of from the match
point, with circumflex characters under the earlier characters. For
example:
re> /abc\Kxyz/
@ -722,7 +719,7 @@ SUBJECT MODIFIERS
0: abcxyz
^^^
Unlike allusedtext, the startchar modifier can be used with JIT. How-
Unlike allusedtext, the startchar modifier can be used with JIT. How-
ever, these two modifiers are mutually exclusive.
Showing the value of all capture groups
@ -730,171 +727,183 @@ SUBJECT MODIFIERS
The allcaptures modifier requests that the values of all potential cap-
tured parentheses be output after a match. By default, only those up to
the highest one actually used in the match are output (corresponding to
the return code from pcre2_match()). Groups that did not take part in
the return code from pcre2_match()). Groups that did not take part in
the match are output as "<unset>".
Testing callouts
A callout function is supplied when pcre2test calls the library match-
ing functions, unless callout_none is specified. If callout_capture is
A callout function is supplied when pcre2test calls the library match-
ing functions, unless callout_none is specified. If callout_capture is
set, the current captured groups are output when a callout occurs.
The callout_fail modifier can be given one or two numbers. If there is
The callout_fail modifier can be given one or two numbers. If there is
only one number, 1 is returned instead of 0 when a callout of that num-
ber is reached. If two numbers are given, 1 is returned when callout
ber is reached. If two numbers are given, 1 is returned when callout
<n> is reached for the <m>th time.
The callout_data modifier can be given an unsigned or a negative num-
ber. Any value other than zero is used as a return from pcre2test's
The callout_data modifier can be given an unsigned or a negative num-
ber. Any value other than zero is used as a return from pcre2test's
callout function.
Testing substring extraction functions
The copy and get modifiers can be used to test the pcre2_sub-
The copy and get modifiers can be used to test the pcre2_sub-
string_copy_xxx() and pcre2_substring_get_xxx() functions. They can be
given more than once, and each can specify a group name or number, for
given more than once, and each can specify a group name or number, for
example:
abcd\=copy=1,copy=3,get=G1
If the #subject command is used to set default copy and get lists,
these can be unset by specifying a negative number for numbered groups
If the #subject command is used to set default copy and get lists,
these can be unset by specifying a negative number for numbered groups
and an empty name for named groups.
The getall modifier tests pcre2_substring_list_get(), which extracts
The getall modifier tests pcre2_substring_list_get(), which extracts
all captured substrings.
If the subject line is successfully matched, the substrings extracted
by the convenience functions are output with C, G, or L after the
string number instead of a colon. This is in addition to the normal
full list. The string length (that is, the return from the extraction
If the subject line is successfully matched, the substrings extracted
by the convenience functions are output with C, G, or L after the
string number instead of a colon. This is in addition to the normal
full list. The string length (that is, the return from the extraction
function) is given in parentheses after each substring.
Finding all matches in a string
Searching for all possible matches within a subject can be requested by
the global or /altglobal modifier. After finding a match, the matching
function is called again to search the remainder of the subject. The
difference between global and altglobal is that the former uses the
start_offset argument to pcre2_match() or pcre2_dfa_match() to start
searching at a new point within the entire string (which is what Perl
the global or /altglobal modifier. After finding a match, the matching
function is called again to search the remainder of the subject. The
difference between global and altglobal is that the former uses the
start_offset argument to pcre2_match() or pcre2_dfa_match() to start
searching at a new point within the entire string (which is what Perl
does), whereas the latter passes over a shortened substring. This makes
a difference to the matching process if the pattern begins with a look-
behind assertion (including \b or \B).
If an empty string is matched, the next match is done with the
If an empty string is matched, the next match is done with the
PCRE2_NOTEMPTY_ATSTART and PCRE2_ANCHORED flags set, in order to search
for another, non-empty, match at the same point in the subject. If this
match fails, the start offset is advanced, and the normal match is
retried. This imitates the way Perl handles such cases when using the
/g modifier or the split() function. Normally, the start offset is
advanced by one character, but if the newline convention recognizes
CRLF as a newline, and the current character is CR followed by LF, an
match fails, the start offset is advanced, and the normal match is
retried. This imitates the way Perl handles such cases when using the
/g modifier or the split() function. Normally, the start offset is
advanced by one character, but if the newline convention recognizes
CRLF as a newline, and the current character is CR followed by LF, an
advance of two is used.
Setting the JIT stack size
The jitstack modifier provides a way of setting the maximum stack size
that is used by the just-in-time optimization code. It is ignored if
The jitstack modifier provides a way of setting the maximum stack size
that is used by the just-in-time optimization code. It is ignored if
JIT optimization is not being used. The value is a number of kilobytes.
Providing a stack that is larger than the default 32K is necessary only
for very complicated patterns.
Setting match and recursion limits
The match_limit and recursion_limit modifiers set the appropriate lim-
The match_limit and recursion_limit modifiers set the appropriate lim-
its in the match context. These values are ignored when the find_limits
modifier is specified.
Finding minimum limits
If the find_limits modifier is present, pcre2test calls pcre2_match()
several times, setting different values in the match context via
pcre2_set_match_limit() and pcre2_set_recursion_limit() until it finds
the minimum values for each parameter that allow pcre2_match() to com-
If the find_limits modifier is present, pcre2test calls pcre2_match()
several times, setting different values in the match context via
pcre2_set_match_limit() and pcre2_set_recursion_limit() until it finds
the minimum values for each parameter that allow pcre2_match() to com-
plete without error.
If JIT is being used, only the match limit is relevant. If DFA matching
is being used, neither limit is relevant, and this modifier is ignored
is being used, neither limit is relevant, and this modifier is ignored
(with a warning message).
The match_limit number is a measure of the amount of backtracking that
takes place, and learning the minimum value can be instructive. For
most simple matches, the number is quite small, but for patterns with
very large numbers of matching possibilities, it can become large very
quickly with increasing length of subject string. The
match_limit_recursion number is a measure of how much stack (or, if
PCRE2 is compiled with NO_RECURSE, how much heap) memory is needed to
The match_limit number is a measure of the amount of backtracking that
takes place, and learning the minimum value can be instructive. For
most simple matches, the number is quite small, but for patterns with
very large numbers of matching possibilities, it can become large very
quickly with increasing length of subject string. The
match_limit_recursion number is a measure of how much stack (or, if
PCRE2 is compiled with NO_RECURSE, how much heap) memory is needed to
complete the match attempt.
Showing MARK names
The mark modifier causes the names from backtracking control verbs that
are returned from calls to pcre2_match() to be displayed. If a mark is
returned for a match, non-match, or partial match, pcre2test shows it.
For a match, it is on a line by itself, tagged with "MK:". Otherwise,
are returned from calls to pcre2_match() to be displayed. If a mark is
returned for a match, non-match, or partial match, pcre2test shows it.
For a match, it is on a line by itself, tagged with "MK:". Otherwise,
it is added to the non-match message.
Showing memory usage
The memory modifier causes pcre2test to log all memory allocation and
The memory modifier causes pcre2test to log all memory allocation and
freeing calls that occur during a match operation.
Setting a starting offset
The offset modifier sets an offset in the subject string at which
The offset modifier sets an offset in the subject string at which
matching starts. Its value is a number of code units, not characters.
Setting the size of the output vector
The ovector modifier applies only to the subject line in which it
appears, though of course it can also be used to set a default in a
#subject command. It specifies the number of pairs of offsets that are
The ovector modifier applies only to the subject line in which it
appears, though of course it can also be used to set a default in a
#subject command. It specifies the number of pairs of offsets that are
available for storing matching information. The default is 15.
A value of zero is useful when testing the POSIX API because it causes
A value of zero is useful when testing the POSIX API because it causes
regexec() to be called with a NULL capture vector. When not testing the
POSIX API, a value of zero is used to cause pcre2_match_data_cre-
ate_from_pattern to be called, in order to create a match block of
POSIX API, a value of zero is used to cause pcre2_match_data_cre-
ate_from_pattern to be called, in order to create a match block of
exactly the right size for the pattern. (It is not possible to create a
match block with a zero-length ovector; there is always one pair of
match block with a zero-length ovector; there is always one pair of
offsets.)
Passing the subject as zero-terminated
By default, the subject string is passed to a native API matching func-
tion with its correct length. In order to test the facility for passing
a zero-terminated string, the zero_terminate modifier is provided. It
causes the length to be passed as PCRE2_ZERO_TERMINATED. (When matching
via the POSIX interface, this modifier has no effect, as there is no
facility for passing a length.)
When testing pcre2_substitute, this modifier also has the effect of
passing the replacement string as zero-terminated.
THE ALTERNATIVE MATCHING FUNCTION
By default, pcre2test uses the standard PCRE2 matching function,
By default, pcre2test uses the standard PCRE2 matching function,
pcre2_match() to match each subject line. PCRE2 also supports an alter-
native matching function, pcre2_dfa_match(), which operates in a dif-
ferent way, and has some restrictions. The differences between the two
native matching function, pcre2_dfa_match(), which operates in a dif-
ferent way, and has some restrictions. The differences between the two
functions are described in the pcre2matching documentation.
If the dfa modifier is set, the alternative matching function is used.
This function finds all possible matches at a given point in the sub-
ject. If, however, the dfa_shortest modifier is set, processing stops
after the first match is found. This is always the shortest possible
If the dfa modifier is set, the alternative matching function is used.
This function finds all possible matches at a given point in the sub-
ject. If, however, the dfa_shortest modifier is set, processing stops
after the first match is found. This is always the shortest possible
match.
DEFAULT OUTPUT FROM pcre2test
This section describes the output when the normal matching function,
This section describes the output when the normal matching function,
pcre2_match(), is being used.
When a match succeeds, pcre2test outputs the list of captured sub-
strings, starting with number 0 for the string that matched the whole
pattern. Otherwise, it outputs "No match" when the return is
PCRE2_ERROR_NOMATCH, or "Partial match:" followed by the partially
matching substring when the return is PCRE2_ERROR_PARTIAL. (Note that
this is the entire substring that was inspected during the partial
match; it may include characters before the actual match start if a
When a match succeeds, pcre2test outputs the list of captured sub-
strings, starting with number 0 for the string that matched the whole
pattern. Otherwise, it outputs "No match" when the return is
PCRE2_ERROR_NOMATCH, or "Partial match:" followed by the partially
matching substring when the return is PCRE2_ERROR_PARTIAL. (Note that
this is the entire substring that was inspected during the partial
match; it may include characters before the actual match start if a
lookbehind assertion, \K, \b, or \B was involved.)
For any other return, pcre2test outputs the PCRE2 negative error number
and a short descriptive phrase. If the error is a failed UTF string
check, the offset of the start of the failing character and the reason
code are also output. Here is an example of an interactive pcre2test
and a short descriptive phrase. If the error is a failed UTF string
check, the offset of the start of the failing character and the reason
code are also output. Here is an example of an interactive pcre2test
run.
$ pcre2test
@ -908,10 +917,10 @@ DEFAULT OUTPUT FROM pcre2test
No match
Unset capturing substrings that are not followed by one that is set are
not returned by pcre2_match(), and are not shown by pcre2test. In the
following example, there are two capturing substrings, but when the
first data line is matched, the second, unset substring is not shown.
An "internal" unset substring is shown as "<unset>", as for the second
not returned by pcre2_match(), and are not shown by pcre2test. In the
following example, there are two capturing substrings, but when the
first data line is matched, the second, unset substring is not shown.
An "internal" unset substring is shown as "<unset>", as for the second
data line.
re> /(a)|(b)/
@ -923,11 +932,11 @@ DEFAULT OUTPUT FROM pcre2test
1: <unset>
2: b
If the strings contain any non-printing characters, they are output as
\xhh escapes if the value is less than 256 and UTF mode is not set.
If the strings contain any non-printing characters, they are output as
\xhh escapes if the value is less than 256 and UTF mode is not set.
Otherwise they are output as \x{hh...} escapes. See below for the defi-
nition of non-printing characters. If the /aftertext modifier is set,
the output for substring 0 is followed by the the rest of the subject
nition of non-printing characters. If the /aftertext modifier is set,
the output for substring 0 is followed by the the rest of the subject
string, identified by "0+" like this:
re> /cat/aftertext
@ -935,7 +944,7 @@ DEFAULT OUTPUT FROM pcre2test
0: cat
0+ aract
If global matching is requested, the results of successive matching
If global matching is requested, the results of successive matching
attempts are output in sequence, like this:
re> /\Bi(\w\w)/g
@ -947,8 +956,8 @@ DEFAULT OUTPUT FROM pcre2test
0: ipp
1: pp
"No match" is output only if the first match attempt fails. Here is an
example of a failure message (the offset 4 that is specified by \>4 is
"No match" is output only if the first match attempt fails. Here is an
example of a failure message (the offset 4 that is specified by \>4 is
past the end of the subject string):
re> /xyz/
@ -956,7 +965,7 @@ DEFAULT OUTPUT FROM pcre2test
Error -24 (bad offset value)
Note that whereas patterns can be continued over several lines (a plain
">" prompt is used for continuations), subject lines may not. However
">" prompt is used for continuations), subject lines may not. However
newlines can be included in a subject by means of the \n escape (or \r,
\r\n, etc., depending on the newline sequence setting).
@ -964,7 +973,7 @@ DEFAULT OUTPUT FROM pcre2test
OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION
When the alternative matching function, pcre2_dfa_match(), is used, the
output consists of a list of all the matches that start at the first
output consists of a list of all the matches that start at the first
point in the subject where there is at least one match. For example:
re> /(tang|tangerine|tan)/
@ -973,11 +982,11 @@ OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION
1: tang
2: tan
(Using the normal matching function on this data finds only "tang".)
The longest matching string is always given first (and numbered zero).
After a PCRE2_ERROR_PARTIAL return, the output is "Partial match:",
followed by the partially matching substring. (Note that this is the
entire substring that was inspected during the partial match; it may
(Using the normal matching function on this data finds only "tang".)
The longest matching string is always given first (and numbered zero).
After a PCRE2_ERROR_PARTIAL return, the output is "Partial match:",
followed by the partially matching substring. (Note that this is the
entire substring that was inspected during the partial match; it may
include characters before the actual match start if a lookbehind asser-
tion, \K, \b, or \B was involved.)
@ -993,16 +1002,16 @@ OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION
1: tan
0: tan
The alternative matching function does not support substring capture,
so the modifiers that are concerned with captured substrings are not
The alternative matching function does not support substring capture,
so the modifiers that are concerned with captured substrings are not
relevant.
RESTARTING AFTER A PARTIAL MATCH
When the alternative matching function has given the PCRE2_ERROR_PAR-
When the alternative matching function has given the PCRE2_ERROR_PAR-
TIAL return, indicating that the subject partially matched the pattern,
you can restart the match with additional subject data by means of the
you can restart the match with additional subject data by means of the
dfa_restart modifier. For example:
re> /^\d?\d(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\d\d$/
@ -1011,29 +1020,29 @@ RESTARTING AFTER A PARTIAL MATCH
data> n05\=dfa,dfa_restart
0: n05
For further information about partial matching, see the pcre2partial
For further information about partial matching, see the pcre2partial
documentation.
CALLOUTS
If the pattern contains any callout requests, pcre2test's callout func-
tion is called during matching. This works with both matching func-
tion is called during matching. This works with both matching func-
tions. By default, the called function displays the callout number, the
start and current positions in the text at the callout time, and the
start and current positions in the text at the callout time, and the
next pattern item to be tested. For example:
--->pqrabcdef
0 ^ ^ \d
This output indicates that callout number 0 occurred for a match
attempt starting at the fourth character of the subject string, when
the pointer was at the seventh character, and when the next pattern
item was \d. Just one circumflex is output if the start and current
This output indicates that callout number 0 occurred for a match
attempt starting at the fourth character of the subject string, when
the pointer was at the seventh character, and when the next pattern
item was \d. Just one circumflex is output if the start and current
positions are the same.
Callouts numbered 255 are assumed to be automatic callouts, inserted as
a result of the /auto_callout pattern modifier. In this case, instead
a result of the /auto_callout pattern modifier. In this case, instead
of showing the callout number, the offset in the pattern, preceded by a
plus, is output. For example:
@ -1047,7 +1056,7 @@ CALLOUTS
0: E*
If a pattern contains (*MARK) items, an additional line is output when-
ever a change of latest mark is passed to the callout function. For
ever a change of latest mark is passed to the callout function. For
example:
re> /a(*MARK:X)bc/auto_callout
@ -1061,30 +1070,30 @@ CALLOUTS
+12 ^ ^
0: abc
The mark changes between matching "a" and "b", but stays the same for
the rest of the match, so nothing more is output. If, as a result of
backtracking, the mark reverts to being unset, the text "<unset>" is
The mark changes between matching "a" and "b", but stays the same for
the rest of the match, so nothing more is output. If, as a result of
backtracking, the mark reverts to being unset, the text "<unset>" is
output.
The callout function in pcre2test returns zero (carry on matching) by
default, but you can use a callout_fail modifier in a subject line (as
The callout function in pcre2test returns zero (carry on matching) by
default, but you can use a callout_fail modifier in a subject line (as
described above) to change this and other parameters of the callout.
Inserting callouts can be helpful when using pcre2test to check compli-
cated regular expressions. For further information about callouts, see
cated regular expressions. For further information about callouts, see
the pcre2callout documentation.
NON-PRINTING CHARACTERS
When pcre2test is outputting text in the compiled version of a pattern,
bytes other than 32-126 are always treated as non-printing characters
bytes other than 32-126 are always treated as non-printing characters
and are therefore shown as hex escapes.
When pcre2test is outputting text that is a matched part of a subject
string, it behaves in the same way, unless a different locale has been
set for the pattern (using the /locale modifier). In this case, the
isprint() function is used to distinguish printing and non-printing
When pcre2test is outputting text that is a matched part of a subject
string, it behaves in the same way, unless a different locale has been
set for the pattern (using the /locale modifier). In this case, the
isprint() function is used to distinguish printing and non-printing
characters.
@ -1103,5 +1112,5 @@ AUTHOR
REVISION
Last updated: 02 November 2014
Last updated: 09 November 2014
Copyright (c) 1997-2014 University of Cambridge.

27
src/pcre2_substitute.c
View File

@ -67,8 +67,8 @@ Arguments:
buffer where to put the substituted string
blength points to length of buffer; updated to length of string
Returns: > 0 number of substitutions made
< 0 an error code, including PCRE2_ERROR_NOMATCH if no match
Returns: >= 0 number of substitutions made
< 0 an error code
PCRE2_ERROR_BADREPLACEMENT means invalid use of $
*/
@ -78,8 +78,8 @@ pcre2_substitute(const pcre2_code *code, PCRE2_SPTR subject, PCRE2_SIZE length,
pcre2_match_context *mcontext, PCRE2_SPTR replacement, PCRE2_SIZE rlength,
PCRE2_UCHAR *buffer, PCRE2_SIZE *blength)
{
int rc = 0;
int subs = 0;
int rc;
int subs;
uint32_t ovector_count;
uint32_t goptions = 0;
BOOL match_data_created = FALSE;
@ -91,7 +91,7 @@ PCRE2_SIZE *ovector;
if ((options & (PCRE2_PARTIAL_HARD|PCRE2_PARTIAL_SOFT)) != 0)
return PCRE2_ERROR_BADOPTION;
/* If no match data block is provided, create one. */
if (match_data == NULL)
@ -106,6 +106,21 @@ if (match_data == NULL)
ovector = pcre2_get_ovector_pointer(match_data);
ovector_count = pcre2_get_ovector_count(match_data);
/* Check UTF replacement string if necessary. */
#ifdef SUPPORT_UNICODE
if ((code->overall_options & PCRE2_UTF) != 0 &&
(options & PCRE2_NO_UTF_CHECK) == 0)
{
rc = PRIV(valid_utf)(replacement, rlength, &(match_data->rightchar));
if (rc != 0)
{
match_data->leftchar = 0;
goto EXIT;
}
}
#endif /* SUPPORT_UNICODE */
/* Notice the global option and remove it from the options that are passed to
pcre2_match(). */
@ -129,6 +144,7 @@ lengthleft = *blength - start_offset;
/* Loop for global substituting. */
subs = 0;
do
{
PCRE2_SIZE i;
@ -273,6 +289,7 @@ buffer[buff_offset] = 0;
EXIT:
if (match_data_created) pcre2_match_data_free(match_data);
else match_data->rc = rc;
return rc;
NOROOM:

2
src/pcre2_substring.c
View File

@ -473,7 +473,7 @@ Arguments:
Returns: the number of the named parenthesis, or a negative number
PCRE2_ERROR_NOSUBSTRING if not found
PCRE2_ERROR_NOUNIQUESUBSTRING if not unique
PCRE2_ERROR_NOUNIQUESUBSTRING if not unique
*/
PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

4
src/pcre2test.c
View File

@ -1547,7 +1547,7 @@ the three different cases. */
#define PCRE2_GET_STARTCHAR(a,b) a = pcre2_get_startchar_16(G(b,16))
#define PCRE2_JIT_COMPILE(a,b) pcre2_jit_compile_16(G(a,16),b)
#define PCRE2_JIT_FREE_UNUSED_MEMORY(a) pcre2_jit_free_unused_memory_16(G(a,16))
#define PCRE2_JIT_MATCH(a,b,c,d,e,f,g,h,i) \
#define PCRE2_JIT_MATCH(a,b,c,d,e,f,g,h) \
a = pcre2_jit_match_16(G(b,16),(PCRE2_SPTR16)c,d,e,f,G(g,16),G(h,16))
#define PCRE2_JIT_STACK_CREATE(a,b,c,d) \
a = (PCRE2_JIT_STACK *)pcre2_jit_stack_create_16(b,c,d);
@ -1628,7 +1628,7 @@ the three different cases. */
#define PCRE2_GET_STARTCHAR(a,b) a = pcre2_get_startchar_32(G(b,32))
#define PCRE2_JIT_COMPILE(a,b) pcre2_jit_compile_32(G(a,32),b)
#define PCRE2_JIT_FREE_UNUSED_MEMORY(a) pcre2_jit_free_unused_memory_32(G(a,32))
#define PCRE2_JIT_MATCH(a,b,c,d,e,f,g,h,i) \
#define PCRE2_JIT_MATCH(a,b,c,d,e,f,g,h) \
a = pcre2_jit_match_32(G(b,32),(PCRE2_SPTR32)c,d,e,f,G(g,32),G(h,32))
#define PCRE2_JIT_STACK_CREATE(a,b,c,d) \
a = (PCRE2_JIT_STACK *)pcre2_jit_stack_create_32(b,c,d);