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revision 53 by nigel, Sat Feb 24 21:39:42 2007 UTC revision 286 by ph10, Mon Dec 17 14:46:11 2007 UTC
# Line 5  The latest release of PCRE is always ava Line 5  The latest release of PCRE is always ava
5    
6    ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.gz    ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.gz
7    
8    There is a mailing list for discussion about the development of PCRE at
9    
10      pcre-dev@exim.org
11    
12  Please read the NEWS file if you are upgrading from a previous release.  Please read the NEWS file if you are upgrading from a previous release.
13    The contents of this README file are:
14    
15  PCRE has its own native API, but a set of "wrapper" functions that are based on    The PCRE APIs
16  the POSIX API are also supplied in the library libpcreposix. Note that this    Documentation for PCRE
17  just provides a POSIX calling interface to PCRE: the regular expressions    Contributions by users of PCRE
18  themselves still follow Perl syntax and semantics. The header file    Building PCRE on non-Unix systems
19  for the POSIX-style functions is called pcreposix.h. The official POSIX name is    Building PCRE on Unix-like systems
20  regex.h, but I didn't want to risk possible problems with existing files of    Retrieving configuration information on Unix-like systems
21  that name by distributing it that way. To use it with an existing program that    Shared libraries on Unix-like systems
22  uses the POSIX API, it will have to be renamed or pointed at by a link.    Cross-compiling on Unix-like systems
23      Using HP's ANSI C++ compiler (aCC)
24      Making new tarballs
25      Testing PCRE
26      Character tables
27      File manifest
28    
29    
30    The PCRE APIs
31    -------------
32    
33    PCRE is written in C, and it has its own API. The distribution also includes a
34    set of C++ wrapper functions (see the pcrecpp man page for details), courtesy
35    of Google Inc.
36    
37    In addition, there is a set of C wrapper functions that are based on the POSIX
38    regular expression API (see the pcreposix man page). These end up in the
39    library called libpcreposix. Note that this just provides a POSIX calling
40    interface to PCRE; the regular expressions themselves still follow Perl syntax
41    and semantics. The POSIX API is restricted, and does not give full access to
42    all of PCRE's facilities.
43    
44    The header file for the POSIX-style functions is called pcreposix.h. The
45    official POSIX name is regex.h, but I did not want to risk possible problems
46    with existing files of that name by distributing it that way. To use PCRE with
47    an existing program that uses the POSIX API, pcreposix.h will have to be
48    renamed or pointed at by a link.
49    
50    If you are using the POSIX interface to PCRE and there is already a POSIX regex
51    library installed on your system, as well as worrying about the regex.h header
52    file (as mentioned above), you must also take care when linking programs to
53    ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
54    up the POSIX functions of the same name from the other library.
55    
56    One way of avoiding this confusion is to compile PCRE with the addition of
57    -Dregcomp=PCREregcomp (and similarly for the other POSIX functions) to the
58    compiler flags (CFLAGS if you are using "configure" -- see below). This has the
59    effect of renaming the functions so that the names no longer clash. Of course,
60    you have to do the same thing for your applications, or write them using the
61    new names.
62    
63    
64    Documentation for PCRE
65    ----------------------
66    
67    If you install PCRE in the normal way on a Unix-like system, you will end up
68    with a set of man pages whose names all start with "pcre". The one that is just
69    called "pcre" lists all the others. In addition to these man pages, the PCRE
70    documentation is supplied in two other forms:
71    
72      1. There are files called doc/pcre.txt, doc/pcregrep.txt, and
73         doc/pcretest.txt in the source distribution. The first of these is a
74         concatenation of the text forms of all the section 3 man pages except
75         those that summarize individual functions. The other two are the text
76         forms of the section 1 man pages for the pcregrep and pcretest commands.
77         These text forms are provided for ease of scanning with text editors or
78         similar tools. They are installed in <prefix>/share/doc/pcre, where
79         <prefix> is the installation prefix (defaulting to /usr/local).
80    
81      2. A set of files containing all the documentation in HTML form, hyperlinked
82         in various ways, and rooted in a file called index.html, is distributed in
83         doc/html and installed in <prefix>/share/doc/pcre/html.
84    
85    
86  Contributions by users of PCRE  Contributions by users of PCRE
# Line 24  You can find contributions from PCRE use Line 90  You can find contributions from PCRE use
90    
91    ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib    ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
92    
93  where there is also a README file giving brief descriptions of what they are.  There is a README file giving brief descriptions of what they are. Some are
94  Several of them provide support for compiling PCRE on various flavours of  complete in themselves; others are pointers to URLs containing relevant files.
95  Windows systems (I myself do not use Windows). Some are complete in themselves;  Some of this material is likely to be well out-of-date. Several of the earlier
96  others are pointers to URLs containing relevant files.  contributions provided support for compiling PCRE on various flavours of
97    Windows (I myself do not use Windows). Nowadays there is more Windows support
98    in the standard distribution, so these contibutions have been archived.
99  Building PCRE on a Unix system  
100  ------------------------------  
101    Building PCRE on non-Unix systems
102  To build PCRE on a Unix system, first run the "configure" command from the PCRE  ---------------------------------
103  distribution directory, with your current directory set to the directory where  
104  you want the files to be created. This command is a standard GNU "autoconf"  For a non-Unix system, please read the comments in the file NON-UNIX-USE,
105  configuration script, for which generic instructions are supplied in INSTALL.  though if your system supports the use of "configure" and "make" you may be
106    able to build PCRE in the same way as for Unix-like systems. PCRE can also be
107    configured in many platform environments using the GUI facility of CMake's
108    CMakeSetup. It creates Makefiles, solution files, etc.
109    
110    PCRE has been compiled on many different operating systems. It should be
111    straightforward to build PCRE on any system that has a Standard C compiler and
112    library, because it uses only Standard C functions.
113    
114    
115    Building PCRE on Unix-like systems
116    ----------------------------------
117    
118    If you are using HP's ANSI C++ compiler (aCC), please see the special note
119    in the section entitled "Using HP's ANSI C++ compiler (aCC)" below.
120    
121    The following instructions assume the use of the widely used "configure, make,
122    make install" process. There is also some experimental support for "cmake" in
123    the PCRE distribution, but it is incomplete and not documented. However, if you
124    are a "cmake" user, you might want to try it.
125    
126    To build PCRE on a Unix-like system, first run the "configure" command from the
127    PCRE distribution directory, with your current directory set to the directory
128    where you want the files to be created. This command is a standard GNU
129    "autoconf" configuration script, for which generic instructions are supplied in
130    the file INSTALL.
131    
132  Most commonly, people build PCRE within its own distribution directory, and in  Most commonly, people build PCRE within its own distribution directory, and in
133  this case, on many systems, just running "./configure" is sufficient, but the  this case, on many systems, just running "./configure" is sufficient. However,
134  usual methods of changing standard defaults are available. For example,  the usual methods of changing standard defaults are available. For example:
135    
136  CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local  CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
137    
# Line 55  into /source/pcre/pcre-xxx, but you want Line 146  into /source/pcre/pcre-xxx, but you want
146  cd /build/pcre/pcre-xxx  cd /build/pcre/pcre-xxx
147  /source/pcre/pcre-xxx/configure  /source/pcre/pcre-xxx/configure
148    
149  If you want to make use of the experimential, incomplete support for UTF-8  PCRE is written in C and is normally compiled as a C library. However, it is
150  character strings in PCRE, you must add --enable-utf8 to the "configure"  possible to build it as a C++ library, though the provided building apparatus
151  command. Without it, the code for handling UTF-8 is not included in the  does not have any features to support this.
152  library. (Even when included, it still has to be enabled by an option at run  
153  time.)  There are some optional features that can be included or omitted from the PCRE
154    library. You can read more about them in the pcrebuild man page.
155    
156    . If you want to suppress the building of the C++ wrapper library, you can add
157      --disable-cpp to the "configure" command. Otherwise, when "configure" is run,
158      it will try to find a C++ compiler and C++ header files, and if it succeeds,
159      it will try to build the C++ wrapper.
160    
161    . If you want to make use of the support for UTF-8 character strings in PCRE,
162      you must add --enable-utf8 to the "configure" command. Without it, the code
163      for handling UTF-8 is not included in the library. (Even when included, it
164      still has to be enabled by an option at run time.)
165    
166    . If, in addition to support for UTF-8 character strings, you want to include
167      support for the \P, \p, and \X sequences that recognize Unicode character
168      properties, you must add --enable-unicode-properties to the "configure"
169      command. This adds about 30K to the size of the library (in the form of a
170      property table); only the basic two-letter properties such as Lu are
171      supported.
172    
173    . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
174      of the preceding, or any of the Unicode newline sequences as indicating the
175      end of a line. Whatever you specify at build time is the default; the caller
176      of PCRE can change the selection at run time. The default newline indicator
177      is a single LF character (the Unix standard). You can specify the default
178      newline indicator by adding --enable-newline-is-cr or --enable-newline-is-lf
179      or --enable-newline-is-crlf or --enable-newline-is-anycrlf or
180      --enable-newline-is-any to the "configure" command, respectively.
181    
182      If you specify --enable-newline-is-cr or --enable-newline-is-crlf, some of
183      the standard tests will fail, because the lines in the test files end with
184      LF. Even if the files are edited to change the line endings, there are likely
185      to be some failures. With --enable-newline-is-anycrlf or
186      --enable-newline-is-any, many tests should succeed, but there may be some
187      failures.
188    
189    . By default, the sequence \R in a pattern matches any Unicode line ending
190      sequence. This is independent of the option specifying what PCRE considers to
191      be the end of a line (see above). However, the caller of PCRE can restrict \R
192      to match only CR, LF, or CRLF. You can make this the default by adding
193      --enable-bsr-anycrlf to the "configure" command (bsr = "backslash R").
194    
195    . When called via the POSIX interface, PCRE uses malloc() to get additional
196      storage for processing capturing parentheses if there are more than 10 of
197      them in a pattern. You can increase this threshold by setting, for example,
198    
199      --with-posix-malloc-threshold=20
200    
201      on the "configure" command.
202    
203    . PCRE has a counter that can be set to limit the amount of resources it uses.
204      If the limit is exceeded during a match, the match fails. The default is ten
205      million. You can change the default by setting, for example,
206    
207      --with-match-limit=500000
208    
209      on the "configure" command. This is just the default; individual calls to
210      pcre_exec() can supply their own value. There is more discussion on the
211      pcreapi man page.
212    
213    . There is a separate counter that limits the depth of recursive function calls
214      during a matching process. This also has a default of ten million, which is
215      essentially "unlimited". You can change the default by setting, for example,
216    
217      --with-match-limit-recursion=500000
218    
219      Recursive function calls use up the runtime stack; running out of stack can
220      cause programs to crash in strange ways. There is a discussion about stack
221      sizes in the pcrestack man page.
222    
223    . The default maximum compiled pattern size is around 64K. You can increase
224      this by adding --with-link-size=3 to the "configure" command. You can
225      increase it even more by setting --with-link-size=4, but this is unlikely
226      ever to be necessary. Increasing the internal link size will reduce
227      performance.
228    
229    . You can build PCRE so that its internal match() function that is called from
230      pcre_exec() does not call itself recursively. Instead, it uses memory blocks
231      obtained from the heap via the special functions pcre_stack_malloc() and
232      pcre_stack_free() to save data that would otherwise be saved on the stack. To
233      build PCRE like this, use
234    
235      --disable-stack-for-recursion
236    
237      on the "configure" command. PCRE runs more slowly in this mode, but it may be
238      necessary in environments with limited stack sizes. This applies only to the
239      pcre_exec() function; it does not apply to pcre_dfa_exec(), which does not
240      use deeply nested recursion. There is a discussion about stack sizes in the
241      pcrestack man page.
242    
243    . For speed, PCRE uses four tables for manipulating and identifying characters
244      whose code point values are less than 256. By default, it uses a set of
245      tables for ASCII encoding that is part of the distribution. If you specify
246    
247      --enable-rebuild-chartables
248    
249      a program called dftables is compiled and run in the default C locale when
250      you obey "make". It builds a source file called pcre_chartables.c. If you do
251      not specify this option, pcre_chartables.c is created as a copy of
252      pcre_chartables.c.dist. See "Character tables" below for further information.
253    
254    . It is possible to compile PCRE for use on systems that use EBCDIC as their
255      default character code (as opposed to ASCII) by specifying
256    
257      --enable-ebcdic
258    
259      This automatically implies --enable-rebuild-chartables (see above).
260    
261    . It is possible to compile pcregrep to use libz and/or libbz2 to read .gz
262      and .bz2 files (respectively) by specifying one or both of
263    
264      --enable-pcregrep-libz
265      --enable-pcregrep-libbz2
266    
267    The "configure" script builds the following files for the basic C library:
268    
269    . Makefile is the makefile that builds the library
270    . config.h contains build-time configuration options for the library
271    . pcre.h is the public PCRE header file
272    . pcre-config is a script that shows the settings of "configure" options
273    . libpcre.pc is data for the pkg-config command
274    . libtool is a script that builds shared and/or static libraries
275    . RunTest is a script for running tests on the basic C library
276    . RunGrepTest is a script for running tests on the pcregrep command
277    
278  The "configure" script builds five files:  Versions of config.h and pcre.h are distributed in the PCRE tarballs under
279    the names config.h.generic and pcre.h.generic. These are provided for the
280    benefit of those who have to built PCRE without the benefit of "configure". If
281    you use "configure", the .generic versions are not used.
282    
283    If a C++ compiler is found, the following files are also built:
284    
285    . libpcrecpp.pc is data for the pkg-config command
286    . pcrecpparg.h is a header file for programs that call PCRE via the C++ wrapper
287    . pcre_stringpiece.h is the header for the C++ "stringpiece" functions
288    
289    The "configure" script also creates config.status, which is an executable
290    script that can be run to recreate the configuration, and config.log, which
291    contains compiler output from tests that "configure" runs.
292    
293    Once "configure" has run, you can run "make". It builds two libraries, called
294    libpcre and libpcreposix, a test program called pcretest, a demonstration
295    program called pcredemo, and the pcregrep command. If a C++ compiler was found
296    on your system, "make" also builds the C++ wrapper library, which is called
297    libpcrecpp, and some test programs called pcrecpp_unittest,
298    pcre_scanner_unittest, and pcre_stringpiece_unittest. Building the C++ wrapper
299    can be disabled by adding --disable-cpp to the "configure" command.
300    
301    The command "make check" runs all the appropriate tests. Details of the PCRE
302    tests are given below in a separate section of this document.
303    
304    You can use "make install" to install PCRE into live directories on your
305    system. The following are installed (file names are all relative to the
306    <prefix> that is set when "configure" is run):
307    
308      Commands (bin):
309        pcretest
310        pcregrep
311        pcre-config
312    
313      Libraries (lib):
314        libpcre
315        libpcreposix
316        libpcrecpp (if C++ support is enabled)
317    
318      Configuration information (lib/pkgconfig):
319        libpcre.pc
320        libpcrecpp.pc (if C++ support is enabled)
321    
322      Header files (include):
323        pcre.h
324        pcreposix.h
325        pcre_scanner.h      )
326        pcre_stringpiece.h  ) if C++ support is enabled
327        pcrecpp.h           )
328        pcrecpparg.h        )
329    
330      Man pages (share/man/man{1,3}):
331        pcregrep.1
332        pcretest.1
333        pcre.3
334        pcre*.3 (lots more pages, all starting "pcre")
335    
336      HTML documentation (share/doc/pcre/html):
337        index.html
338        *.html (lots more pages, hyperlinked from index.html)
339    
340      Text file documentation (share/doc/pcre):
341        AUTHORS
342        COPYING
343        ChangeLog
344        LICENCE
345        NEWS
346        README
347        pcre.txt       (a concatenation of the man(3) pages)
348        pcretest.txt   the pcretest man page
349        pcregrep.txt   the pcregrep man page
350    
351    Note that the pcredemo program that is built by "configure" is *not* installed
352    anywhere. It is a demonstration for programmers wanting to use PCRE.
353    
354    If you want to remove PCRE from your system, you can run "make uninstall".
355    This removes all the files that "make install" installed. However, it does not
356    remove any directories, because these are often shared with other programs.
357    
358  . libtool is a script that builds shared and/or static libraries  
359  . Makefile is built by copying Makefile.in and making substitutions.  Retrieving configuration information on Unix-like systems
360  . config.h is built by copying config.in and making substitutions.  ---------------------------------------------------------
361  . pcre-config is built by copying pcre-config.in and making substitutions.  
362  . RunTest is a script for running tests  Running "make install" installs the command pcre-config, which can be used to
363    recall information about the PCRE configuration and installation. For example:
 Once "configure" has run, you can run "make". It builds two libraries called  
 libpcre and libpcreposix, a test program called pcretest, and the pcregrep  
 command. You can use "make install" to copy these, the public header files  
 pcre.h and pcreposix.h, and the man pages to appropriate live directories on  
 your system, in the normal way.  
   
 Running "make install" also installs the command pcre-config, which can be used  
 to recall information about the PCRE configuration and installation. For  
 example,  
364    
365    pcre-config --version    pcre-config --version
366    
367  prints the version number, and  prints the version number, and
368    
369   pcre-config --libs    pcre-config --libs
370    
371  outputs information about where the library is installed. This command can be  outputs information about where the library is installed. This command can be
372  included in makefiles for programs that use PCRE, saving the programmer from  included in makefiles for programs that use PCRE, saving the programmer from
373  having to remember too many details.  having to remember too many details.
374    
375  There is one esoteric feature that is controlled by "configure". It concerns  The pkg-config command is another system for saving and retrieving information
376  the character value used for "newline", and is something that you probably do  about installed libraries. Instead of separate commands for each library, a
377  not want to change on a Unix system. The default is to use whatever value your  single command is used. For example:
378  compiler gives to '\n'. By using --enable-newline-is-cr or  
379  --enable-newline-is-lf you can force the value to be CR (13) or LF (10) if you    pkg-config --cflags pcre
380  really want to.  
381    The data is held in *.pc files that are installed in a directory called
382    <prefix>/lib/pkgconfig.
383    
384    
385  Shared libraries on Unix systems  Shared libraries on Unix-like systems
386  --------------------------------  -------------------------------------
387    
388  The default distribution builds PCRE as two shared libraries and two static  The default distribution builds PCRE as shared libraries and static libraries,
389  libraries, as long as the operating system supports shared libraries. Shared  as long as the operating system supports shared libraries. Shared library
390  library support relies on the "libtool" script which is built as part of the  support relies on the "libtool" script which is built as part of the
391  "configure" process.  "configure" process.
392    
393  The libtool script is used to compile and link both shared and static  The libtool script is used to compile and link both shared and static
# Line 111  built. The programs pcretest and pcregre Line 396  built. The programs pcretest and pcregre
396  libraries (by means of wrapper scripts in the case of shared libraries). When  libraries (by means of wrapper scripts in the case of shared libraries). When
397  you use "make install" to install shared libraries, pcregrep and pcretest are  you use "make install" to install shared libraries, pcregrep and pcretest are
398  automatically re-built to use the newly installed shared libraries before being  automatically re-built to use the newly installed shared libraries before being
399  installed themselves. However, the versions left in the source directory still  installed themselves. However, the versions left in the build directory still
400  use the uninstalled libraries.  use the uninstalled libraries.
401    
402  To build PCRE using static libraries only you must use --disable-shared when  To build PCRE using static libraries only you must use --disable-shared when
403  configuring it. For example  configuring it. For example:
404    
405  ./configure --prefix=/usr/gnu --disable-shared  ./configure --prefix=/usr/gnu --disable-shared
406    
# Line 123  Then run "make" in the usual way. Simila Line 408  Then run "make" in the usual way. Simila
408  build only shared libraries.  build only shared libraries.
409    
410    
411  Building on non-Unix systems  Cross-compiling on Unix-like systems
412  ----------------------------  ------------------------------------
413    
414  For a non-Unix system, read the comments in the file NON-UNIX-USE. PCRE has  You can specify CC and CFLAGS in the normal way to the "configure" command, in
415  been compiled on Windows systems and on Macintoshes, but I don't know the  order to cross-compile PCRE for some other host. However, you should NOT
416  details because I don't use those systems. It should be straightforward to  specify --enable-rebuild-chartables, because if you do, the dftables.c source
417  build PCRE on any system that has a Standard C compiler, because it uses only  file is compiled and run on the local host, in order to generate the inbuilt
418  Standard C functions.  character tables (the pcre_chartables.c file). This will probably not work,
419    because dftables.c needs to be compiled with the local compiler, not the cross
420    compiler.
421    
422    When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
423    by making a copy of pcre_chartables.c.dist, which is a default set of tables
424    that assumes ASCII code. Cross-compiling with the default tables should not be
425    a problem.
426    
427    If you need to modify the character tables when cross-compiling, you should
428    move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
429    run it on the local host to make a new version of pcre_chartables.c.dist.
430    Then when you cross-compile PCRE this new version of the tables will be used.
431    
432    
433    Using HP's ANSI C++ compiler (aCC)
434    ----------------------------------
435    
436    Unless C++ support is disabled by specifying the "--disable-cpp" option of the
437    "configure" script, you must include the "-AA" option in the CXXFLAGS
438    environment variable in order for the C++ components to compile correctly.
439    
440    Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
441    needed libraries fail to get included when specifying the "-AA" compiler
442    option. If you experience unresolved symbols when linking the C++ programs,
443    use the workaround of specifying the following environment variable prior to
444    running the "configure" script:
445    
446      CXXLDFLAGS="-lstd_v2 -lCsup_v2"
447    
448    
449    Making new tarballs
450    -------------------
451    
452    The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
453    zip formats. The command "make distcheck" does the same, but then does a trial
454    build of the new distribution to ensure that it works.
455    
456    If you have modified any of the man page sources in the doc directory, you
457    should first run the PrepareRelease script before making a distribution. This
458    script creates the .txt and HTML forms of the documentation from the man pages.
459    
460    
461  Testing PCRE  Testing PCRE
462  ------------  ------------
463    
464  To test PCRE on a Unix system, run the RunTest script that is created by the  To test the basic PCRE library on a Unix system, run the RunTest script that is
465  configuring process. (This can also be run by "make runtest", "make check", or  created by the configuring process. There is also a script called RunGrepTest
466  "make test".) For other systems, see the instruction in NON-UNIX-USE.  that tests the options of the pcregrep command. If the C++ wrapper library is
467    built, three test programs called pcrecpp_unittest, pcre_scanner_unittest, and
468  The script runs the pcretest test program (which is documented in the doc  pcre_stringpiece_unittest are also built.
469  directory) on each of the testinput files (in the testdata directory) in turn,  
470  and compares the output with the contents of the corresponding testoutput file.  Both the scripts and all the program tests are run if you obey "make check" or
471  A file called testtry is used to hold the output from pcretest. To run pcretest  "make test". For other systems, see the instructions in NON-UNIX-USE.
472  on just one of the test files, give its number as an argument to RunTest, for  
473  example:  The RunTest script runs the pcretest test program (which is documented in its
474    own man page) on each of the testinput files in the testdata directory in
475    RunTest 3  turn, and compares the output with the contents of the corresponding testoutput
476    files. A file called testtry is used to hold the main output from pcretest
477  The first and third test files can also be fed directly into the perltest  (testsavedregex is also used as a working file). To run pcretest on just one of
478  script to check that Perl gives the same results. The third file requires the  the test files, give its number as an argument to RunTest, for example:
479  additional features of release 5.005, which is why it is kept separate from the  
480  main test input, which needs only Perl 5.004. In the long run, when 5.005 (or    RunTest 2
481  higher) is widespread, these two test files may get amalgamated.  
482    The first test file can also be fed directly into the perltest.pl script to
483    check that Perl gives the same results. The only difference you should see is
484    in the first few lines, where the Perl version is given instead of the PCRE
485    version.
486    
487  The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),  The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),
488  pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error  pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
489  detection, and run-time flags that are specific to PCRE, as well as the POSIX  detection, and run-time flags that are specific to PCRE, as well as the POSIX
490  wrapper API. It also uses the debugging flag to check some of the internals of  wrapper API. It also uses the debugging flags to check some of the internals of
491  pcre_compile().  pcre_compile().
492    
493  If you build PCRE with a locale setting that is not the standard C locale, the  If you build PCRE with a locale setting that is not the standard C locale, the
# Line 171  listed for checking. Where the compariso Line 500  listed for checking. Where the compariso
500  test will contain [\x00-\xff], and similarly in some other cases. This is not a  test will contain [\x00-\xff], and similarly in some other cases. This is not a
501  bug in PCRE.  bug in PCRE.
502    
503  The fourth set of tests checks pcre_maketables(), the facility for building a  The third set of tests checks pcre_maketables(), the facility for building a
504  set of character tables for a specific locale and using them instead of the  set of character tables for a specific locale and using them instead of the
505  default tables. The tests make use of the "fr" (French) locale. Before running  default tables. The tests make use of the "fr_FR" (French) locale. Before
506  the test, the script checks for the presence of this locale by running the  running the test, the script checks for the presence of this locale by running
507  "locale" command. If that command fails, or if it doesn't include "fr" in the  the "locale" command. If that command fails, or if it doesn't include "fr_FR"
508  list of available locales, the fourth test cannot be run, and a comment is  in the list of available locales, the third test cannot be run, and a comment
509  output to say why. If running this test produces instances of the error  is output to say why. If running this test produces instances of the error
510    
511    ** Failed to set locale "fr"    ** Failed to set locale "fr_FR"
512    
513  in the comparison output, it means that locale is not available on your system,  in the comparison output, it means that locale is not available on your system,
514  despite being listed by "locale". This does not mean that PCRE is broken.  despite being listed by "locale". This does not mean that PCRE is broken.
515    
516  The fifth test checks the experimental, incomplete UTF-8 support. It is not run  [If you are trying to run this test on Windows, you may be able to get it to
517  automatically unless PCRE is built with UTF-8 support. This file can be fed  work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
518  directly to the perltest8 script, which requires Perl 5.6 or higher. The sixth  RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
519  file tests internal UTF-8 features of PCRE that are not relevant to Perl.  Windows versions of test 2. More info on using RunTest.bat is included in the
520    document entitled NON-UNIX-USE.]
521    
522    The fourth test checks the UTF-8 support. It is not run automatically unless
523    PCRE is built with UTF-8 support. To do this you must set --enable-utf8 when
524    running "configure". This file can be also fed directly to the perltest script,
525    provided you are running Perl 5.8 or higher. (For Perl 5.6, a small patch,
526    commented in the script, can be be used.)
527    
528    The fifth test checks error handling with UTF-8 encoding, and internal UTF-8
529    features of PCRE that are not relevant to Perl.
530    
531    The sixth test checks the support for Unicode character properties. It it not
532    run automatically unless PCRE is built with Unicode property support. To to
533    this you must set --enable-unicode-properties when running "configure".
534    
535    The seventh, eighth, and ninth tests check the pcre_dfa_exec() alternative
536    matching function, in non-UTF-8 mode, UTF-8 mode, and UTF-8 mode with Unicode
537    property support, respectively. The eighth and ninth tests are not run
538    automatically unless PCRE is build with the relevant support.
539    
540    
541  Character tables  Character tables
542  ----------------  ----------------
543    
544  PCRE uses four tables for manipulating and identifying characters. The final  For speed, PCRE uses four tables for manipulating and identifying characters
545  argument of the pcre_compile() function is a pointer to a block of memory  whose code point values are less than 256. The final argument of the
546  containing the concatenated tables. A call to pcre_maketables() can be used to  pcre_compile() function is a pointer to a block of memory containing the
547  generate a set of tables in the current locale. If the final argument for  concatenated tables. A call to pcre_maketables() can be used to generate a set
548  pcre_compile() is passed as NULL, a set of default tables that is built into  of tables in the current locale. If the final argument for pcre_compile() is
549  the binary is used.  passed as NULL, a set of default tables that is built into the binary is used.
550    
551  The source file called chartables.c contains the default set of tables. This is  The source file called pcre_chartables.c contains the default set of tables. By
552  not supplied in the distribution, but is built by the program dftables  default, this is created as a copy of pcre_chartables.c.dist, which contains
553  (compiled from dftables.c), which uses the ANSI C character handling functions  tables for ASCII coding. However, if --enable-rebuild-chartables is specified
554  such as isalnum(), isalpha(), isupper(), islower(), etc. to build the table  for ./configure, a different version of pcre_chartables.c is built by the
555  sources. This means that the default C locale which is set for your system will  program dftables (compiled from dftables.c), which uses the ANSI C character
556  control the contents of these default tables. You can change the default tables  handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
557  by editing chartables.c and then re-building PCRE. If you do this, you should  build the table sources. This means that the default C locale which is set for
558  probably also edit Makefile to ensure that the file doesn't ever get  your system will control the contents of these default tables. You can change
559  re-generated.  the default tables by editing pcre_chartables.c and then re-building PCRE. If
560    you do this, you should take care to ensure that the file does not get
561    automatically re-generated. The best way to do this is to move
562    pcre_chartables.c.dist out of the way and replace it with your customized
563    tables.
564    
565    When the dftables program is run as a result of --enable-rebuild-chartables,
566    it uses the default C locale that is set on your system. It does not pay
567    attention to the LC_xxx environment variables. In other words, it uses the
568    system's default locale rather than whatever the compiling user happens to have
569    set. If you really do want to build a source set of character tables in a
570    locale that is specified by the LC_xxx variables, you can run the dftables
571    program by hand with the -L option. For example:
572    
573      ./dftables -L pcre_chartables.c.special
574    
575  The first two 256-byte tables provide lower casing and case flipping functions,  The first two 256-byte tables provide lower casing and case flipping functions,
576  respectively. The next table consists of three 32-byte bit maps which identify  respectively. The next table consists of three 32-byte bit maps which identify
577  digits, "word" characters, and white space, respectively. These are used when  digits, "word" characters, and white space, respectively. These are used when
578  building 32-byte bit maps that represent character classes.  building 32-byte bit maps that represent character classes for code points less
579    than 256.
580    
581  The final 256-byte table has bits indicating various character types, as  The final 256-byte table has bits indicating various character types, as
582  follows:  follows:
# Line 229  You should not alter the set of characte Line 592  You should not alter the set of characte
592  will cause PCRE to malfunction.  will cause PCRE to malfunction.
593    
594    
595  Manifest  File manifest
596  --------  -------------
597    
598  The distribution should contain the following files:  The distribution should contain the following files:
599    
600  (A) The actual source files of the PCRE library functions and their  (A) Source files of the PCRE library functions and their headers:
     headers:  
   
   dftables.c            auxiliary program for building chartables.c  
   get.c                 )  
   maketables.c          )  
   study.c               ) source of  
   pcre.c                )   the functions  
   pcreposix.c           )  
   pcre.in               "source" for the header for the external API; pcre.h  
                           is built from this by "configure"  
   pcreposix.h           header for the external POSIX wrapper API  
   internal.h            header for internal use  
   config.in             template for config.h, which is built by configure  
   
 (B) Auxiliary files:  
   
   AUTHORS               information about the author of PCRE  
   ChangeLog             log of changes to the code  
   INSTALL               generic installation instructions  
   LICENCE               conditions for the use of PCRE  
   COPYING               the same, using GNU's standard name  
   Makefile.in           template for Unix Makefile, which is built by configure  
   NEWS                  important changes in this release  
   NON-UNIX-USE          notes on building PCRE on non-Unix systems  
   README                this file  
   RunTest.in            template for a Unix shell script for running tests  
   config.guess          ) files used by libtool,  
   config.sub            )   used only when building a shared library  
   configure             a configuring shell script (built by autoconf)  
   configure.in          the autoconf input used to build configure  
   doc/Tech.Notes        notes on the encoding  
   doc/pcre.3            man page source for the PCRE functions  
   doc/pcre.html         HTML version  
   doc/pcre.txt          plain text version  
   doc/pcreposix.3       man page source for the POSIX wrapper API  
   doc/pcreposix.html    HTML version  
   doc/pcreposix.txt     plain text version  
   doc/pcretest.txt      documentation of test program  
   doc/perltest.txt      documentation of Perl test program  
   doc/pcregrep.1        man page source for the pcregrep utility  
   doc/pcregrep.html     HTML version  
   doc/pcregrep.txt      plain text version  
   install-sh            a shell script for installing files  
   ltmain.sh             file used to build a libtool script  
   pcretest.c            comprehensive test program  
   pcredemo.c            simple demonstration of coding calls to PCRE  
   perltest              Perl test program  
   perltest8             Perl test program for UTF-8 tests  
   pcregrep.c            source of a grep utility that uses PCRE  
   pcre-config.in        source of script which retains PCRE information  
   testdata/testinput1   test data, compatible with Perl 5.004 and 5.005  
   testdata/testinput2   test data for error messages and non-Perl things  
   testdata/testinput3   test data, compatible with Perl 5.005  
   testdata/testinput4   test data for locale-specific tests  
   testdata/testinput5   test data for UTF-8 tests compatible with Perl 5.6  
   testdata/testinput6   test data for other UTF-8 tests  
   testdata/testoutput1  test results corresponding to testinput1  
   testdata/testoutput2  test results corresponding to testinput2  
   testdata/testoutput3  test results corresponding to testinput3  
   testdata/testoutput4  test results corresponding to testinput4  
   testdata/testoutput5  test results corresponding to testinput5  
   testdata/testoutput6  test results corresponding to testinput6  
   
 (C) Auxiliary files for Win32 DLL  
601    
602    dll.mk    dftables.c              auxiliary program for building pcre_chartables.c
603    pcre.def                              when --enable-rebuild-chartables is specified
604    
605  Philip Hazel <ph10@cam.ac.uk>    pcre_chartables.c.dist  a default set of character tables that assume ASCII
606  August 2001                              coding; used, unless --enable-rebuild-chartables is
607                                specified, by copying to pcre_chartables.c
608    
609      pcreposix.c             )
610      pcre_compile.c          )
611      pcre_config.c           )
612      pcre_dfa_exec.c         )
613      pcre_exec.c             )
614      pcre_fullinfo.c         )
615      pcre_get.c              ) sources for the functions in the library,
616      pcre_globals.c          )   and some internal functions that they use
617      pcre_info.c             )
618      pcre_maketables.c       )
619      pcre_newline.c          )
620      pcre_ord2utf8.c         )
621      pcre_refcount.c         )
622      pcre_study.c            )
623      pcre_tables.c           )
624      pcre_try_flipped.c      )
625      pcre_ucp_searchfuncs.c  )
626      pcre_valid_utf8.c       )
627      pcre_version.c          )
628      pcre_xclass.c           )
629      pcre_printint.src       ) debugging function that is #included in pcretest,
630                              )   and can also be #included in pcre_compile()
631      pcre.h.in               template for pcre.h when built by "configure"
632      pcreposix.h             header for the external POSIX wrapper API
633      pcre_internal.h         header for internal use
634      ucp.h                   ) headers concerned with
635      ucpinternal.h           )   Unicode property handling
636      ucptable.h              ) (this one is the data table)
637    
638      config.h.in             template for config.h, which is built by "configure"
639    
640      pcrecpp.h               public header file for the C++ wrapper
641      pcrecpparg.h.in         template for another C++ header file
642      pcre_scanner.h          public header file for C++ scanner functions
643      pcrecpp.cc              )
644      pcre_scanner.cc         ) source for the C++ wrapper library
645    
646      pcre_stringpiece.h.in   template for pcre_stringpiece.h, the header for the
647                                C++ stringpiece functions
648      pcre_stringpiece.cc     source for the C++ stringpiece functions
649    
650    (B) Source files for programs that use PCRE:
651    
652      pcredemo.c              simple demonstration of coding calls to PCRE
653      pcregrep.c              source of a grep utility that uses PCRE
654      pcretest.c              comprehensive test program
655    
656    (C) Auxiliary files:
657    
658      132html                 script to turn "man" pages into HTML
659      AUTHORS                 information about the author of PCRE
660      ChangeLog               log of changes to the code
661      CleanTxt                script to clean nroff output for txt man pages
662      Detrail                 script to remove trailing spaces
663      HACKING                 some notes about the internals of PCRE
664      INSTALL                 generic installation instructions
665      LICENCE                 conditions for the use of PCRE
666      COPYING                 the same, using GNU's standard name
667      Makefile.in             ) template for Unix Makefile, which is built by
668                              )   "configure"
669      Makefile.am             ) the automake input that was used to create
670                              )   Makefile.in
671      NEWS                    important changes in this release
672      NON-UNIX-USE            notes on building PCRE on non-Unix systems
673      PrepareRelease          script to make preparations for "make dist"
674      README                  this file
675      RunTest                 a Unix shell script for running tests
676      RunGrepTest             a Unix shell script for pcregrep tests
677      aclocal.m4              m4 macros (generated by "aclocal")
678      config.guess            ) files used by libtool,
679      config.sub              )   used only when building a shared library
680      configure               a configuring shell script (built by autoconf)
681      configure.ac            ) the autoconf input that was used to build
682                              )   "configure" and config.h
683      depcomp                 ) script to find program dependencies, generated by
684                              )   automake
685      doc/*.3                 man page sources for the PCRE functions
686      doc/*.1                 man page sources for pcregrep and pcretest
687      doc/index.html.src      the base HTML page
688      doc/html/*              HTML documentation
689      doc/pcre.txt            plain text version of the man pages
690      doc/pcretest.txt        plain text documentation of test program
691      doc/perltest.txt        plain text documentation of Perl test program
692      install-sh              a shell script for installing files
693      libpcre.pc.in           template for libpcre.pc for pkg-config
694      libpcrecpp.pc.in        template for libpcrecpp.pc for pkg-config
695      ltmain.sh               file used to build a libtool script
696      missing                 ) common stub for a few missing GNU programs while
697                              )   installing, generated by automake
698      mkinstalldirs           script for making install directories
699      perltest.pl             Perl test program
700      pcre-config.in          source of script which retains PCRE information
701      pcrecpp_unittest.cc          )
702      pcre_scanner_unittest.cc     ) test programs for the C++ wrapper
703      pcre_stringpiece_unittest.cc )
704      testdata/testinput*     test data for main library tests
705      testdata/testoutput*    expected test results
706      testdata/grep*          input and output for pcregrep tests
707    
708    (D) Auxiliary files for cmake support
709    
710      CMakeLists.txt
711      config-cmake.h.in
712    
713    (E) Auxiliary files for VPASCAL
714    
715      makevp.bat
716      makevp_c.txt
717      makevp_l.txt
718      pcregexp.pas
719    
720    (F) Auxiliary files for building PCRE "by hand"
721    
722      pcre.h.generic          ) a version of the public PCRE header file
723                              )   for use in non-"configure" environments
724      config.h.generic        ) a version of config.h for use in non-"configure"
725                              )   environments
726    
727    (F) Miscellaneous
728    
729      RunTest.bat            a script for running tests under Windows
730    
731    Philip Hazel
732    Email local part: ph10
733    Email domain: cam.ac.uk
734    Last updated: 17 December 2007

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