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1  README file for PCRE (Perl-compatible regular expression library)  README file for PCRE (Perl-compatible regular expression library)
2  -----------------------------------------------------------------  -----------------------------------------------------------------
3    
4    The latest release of PCRE is always available in three alternative formats
5    from:
6    
7      ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.gz
8      ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.bz2
9      ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.zip
10    
11    There is a mailing list for discussion about the development of PCRE at
12    
13      pcre-dev@exim.org
14    
15  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.
16    The contents of this README file are:
17    
18      The PCRE APIs
19      Documentation for PCRE
20      Contributions by users of PCRE
21      Building PCRE on non-Unix systems
22      Building PCRE on Unix-like systems
23      Retrieving configuration information on Unix-like systems
24      Shared libraries on Unix-like systems
25      Cross-compiling on Unix-like systems
26      Using HP's ANSI C++ compiler (aCC)
27      Using PCRE from MySQL
28      Making new tarballs
29      Testing PCRE
30      Character tables
31      File manifest
32    
33    
34    The PCRE APIs
35    -------------
36    
37    PCRE is written in C, and it has its own API. The distribution also includes a
38    set of C++ wrapper functions (see the pcrecpp man page for details), courtesy
39    of Google Inc.
40    
41    In addition, there is a set of C wrapper functions that are based on the POSIX
42    regular expression API (see the pcreposix man page). These end up in the
43    library called libpcreposix. Note that this just provides a POSIX calling
44    interface to PCRE; the regular expressions themselves still follow Perl syntax
45    and semantics. The POSIX API is restricted, and does not give full access to
46    all of PCRE's facilities.
47    
48    The header file for the POSIX-style functions is called pcreposix.h. The
49    official POSIX name is regex.h, but I did not want to risk possible problems
50    with existing files of that name by distributing it that way. To use PCRE with
51    an existing program that uses the POSIX API, pcreposix.h will have to be
52    renamed or pointed at by a link.
53    
54    If you are using the POSIX interface to PCRE and there is already a POSIX regex
55    library installed on your system, as well as worrying about the regex.h header
56    file (as mentioned above), you must also take care when linking programs to
57    ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
58    up the POSIX functions of the same name from the other library.
59    
60    One way of avoiding this confusion is to compile PCRE with the addition of
61    -Dregcomp=PCREregcomp (and similarly for the other POSIX functions) to the
62    compiler flags (CFLAGS if you are using "configure" -- see below). This has the
63    effect of renaming the functions so that the names no longer clash. Of course,
64    you have to do the same thing for your applications, or write them using the
65    new names.
66    
67    
68    Documentation for PCRE
69    ----------------------
70    
71    If you install PCRE in the normal way on a Unix-like system, you will end up
72    with a set of man pages whose names all start with "pcre". The one that is just
73    called "pcre" lists all the others. In addition to these man pages, the PCRE
74    documentation is supplied in two other forms:
75    
76      1. There are files called doc/pcre.txt, doc/pcregrep.txt, and
77         doc/pcretest.txt in the source distribution. The first of these is a
78         concatenation of the text forms of all the section 3 man pages except
79         those that summarize individual functions. The other two are the text
80         forms of the section 1 man pages for the pcregrep and pcretest commands.
81         These text forms are provided for ease of scanning with text editors or
82         similar tools. They are installed in <prefix>/share/doc/pcre, where
83         <prefix> is the installation prefix (defaulting to /usr/local).
84    
85      2. A set of files containing all the documentation in HTML form, hyperlinked
86         in various ways, and rooted in a file called index.html, is distributed in
87         doc/html and installed in <prefix>/share/doc/pcre/html.
88    
89    Users of PCRE have contributed files containing the documentation for various
90    releases in CHM format. These can be found in the Contrib directory of the FTP
91    site (see next section).
92    
93    
94  Building PCRE on a Unix system  Contributions by users of PCRE
95  ------------------------------  ------------------------------
96    
97  To build PCRE on a Unix system, run the "configure" command in the PCRE  You can find contributions from PCRE users in the directory
 distribution directory. This is a standard GNU "autoconf" configuration script,  
 for which generic instructions are supplied in INSTALL. On many systems just  
 running "./configure" is sufficient, but the usual methods of changing standard  
 defaults are available. For example  
98    
99  CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local    ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
100    
101    There is a README file giving brief descriptions of what they are. Some are
102    complete in themselves; others are pointers to URLs containing relevant files.
103    Some of this material is likely to be well out-of-date. Several of the earlier
104    contributions provided support for compiling PCRE on various flavours of
105    Windows (I myself do not use Windows). Nowadays there is more Windows support
106    in the standard distribution, so these contibutions have been archived.
107    
 specifies that the C compiler should be run with the flags '-O2 -Wall' instead  
 of the default, and that "make install" should install PCRE under /opt/local  
 instead of the default /usr/local. The "configure" script builds two files:  
108    
109  . Makefile is built by copying Makefile.in and making certain substitutions.  Building PCRE on non-Unix systems
110  . config.h is built by copying config.in and making certain substitutions.  ---------------------------------
111    
112  Once "configure" has run, you can run "make". It builds two libraries called  For a non-Unix system, please read the comments in the file NON-UNIX-USE,
113  libpcre.a and libpcreposix.a, a test program called pcretest, and the pgrep  though if your system supports the use of "configure" and "make" you may be
114  command. You can use "make install" to copy these, and the public header file  able to build PCRE in the same way as for Unix-like systems. PCRE can also be
115  pcre.h, to appropriate live directories on your system, in the normal way.  configured in many platform environments using the GUI facility provided by
116    CMake's cmake-gui command. This creates Makefiles, solution files, etc.
117    
118    PCRE has been compiled on many different operating systems. It should be
119    straightforward to build PCRE on any system that has a Standard C compiler and
120    library, because it uses only Standard C functions.
121    
 Shared libraries on Unix systems  
 --------------------------------  
122    
123  The default distribution builds static libraries. It is also possible to build  Building PCRE on Unix-like systems
124  PCRE as two shared libraries. This support is new and experimental and may not  ----------------------------------
 work on all systems. It relies on the "libtool" scripts - these are distributed  
 with PCRE. To build PCRE using shared libraries you must use --enable-shared  
 when configuring it. For example  
125    
126  ./configure --prefix=/usr/gnu --enable-shared  If you are using HP's ANSI C++ compiler (aCC), please see the special note
127    in the section entitled "Using HP's ANSI C++ compiler (aCC)" below.
128    
129  Then run "make" in the usual way. It should build a "libtool" script and use  The following instructions assume the use of the widely used "configure, make,
130  this to compile and link shared libraries, which are placed in a subdirectory  make install" process. There is also support for CMake in the PCRE
131  called .libs. The programs pcretest and pgrep are built to use these  distribution; there are some comments about using CMake in the NON-UNIX-USE
132  uninstalled libraries by means of wrapper scripts. When you use "make install"  file, though it can also be used in Unix-like systems.
 to install shared libraries, pgrep is automatically re-built to use the newly  
 installed library before it itself is installed.  
133    
134    To build PCRE on a Unix-like system, first run the "configure" command from the
135    PCRE distribution directory, with your current directory set to the directory
136    where you want the files to be created. This command is a standard GNU
137    "autoconf" configuration script, for which generic instructions are supplied in
138    the file INSTALL.
139    
140  Building on non-Unix systems  Most commonly, people build PCRE within its own distribution directory, and in
141  ----------------------------  this case, on many systems, just running "./configure" is sufficient. However,
142    the usual methods of changing standard defaults are available. For example:
143    
144  For a non-Unix system, read the comments in the file NON-UNIX-USE. PCRE has  CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
145  been compiled on Windows systems and on Macintoshes, but I don't know the  
146  details because I don't use those systems. It should be straightforward to  specifies that the C compiler should be run with the flags '-O2 -Wall' instead
147  build PCRE on any system that has a Standard C compiler, because it uses only  of the default, and that "make install" should install PCRE under /opt/local
148  Standard C functions.  instead of the default /usr/local.
149    
150    If you want to build in a different directory, just run "configure" with that
151    directory as current. For example, suppose you have unpacked the PCRE source
152    into /source/pcre/pcre-xxx, but you want to build it in /build/pcre/pcre-xxx:
153    
154    cd /build/pcre/pcre-xxx
155    /source/pcre/pcre-xxx/configure
156    
157    PCRE is written in C and is normally compiled as a C library. However, it is
158    possible to build it as a C++ library, though the provided building apparatus
159    does not have any features to support this.
160    
161    There are some optional features that can be included or omitted from the PCRE
162    library. You can read more about them in the pcrebuild man page.
163    
164    . If you want to suppress the building of the C++ wrapper library, you can add
165      --disable-cpp to the "configure" command. Otherwise, when "configure" is run,
166      it will try to find a C++ compiler and C++ header files, and if it succeeds,
167      it will try to build the C++ wrapper.
168    
169    . If you want to make use of the support for UTF-8 Unicode character strings in
170      PCRE, you must add --enable-utf8 to the "configure" command. Without it, the
171      code for handling UTF-8 is not included in the library. Even when included,
172      it still has to be enabled by an option at run time. When PCRE is compiled
173      with this option, its input can only either be ASCII or UTF-8, even when
174      running on EBCDIC platforms. It is not possible to use both --enable-utf8 and
175      --enable-ebcdic at the same time.
176    
177    . If, in addition to support for UTF-8 character strings, you want to include
178      support for the \P, \p, and \X sequences that recognize Unicode character
179      properties, you must add --enable-unicode-properties to the "configure"
180      command. This adds about 30K to the size of the library (in the form of a
181      property table); only the basic two-letter properties such as Lu are
182      supported.
183    
184    . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
185      of the preceding, or any of the Unicode newline sequences as indicating the
186      end of a line. Whatever you specify at build time is the default; the caller
187      of PCRE can change the selection at run time. The default newline indicator
188      is a single LF character (the Unix standard). You can specify the default
189      newline indicator by adding --enable-newline-is-cr or --enable-newline-is-lf
190      or --enable-newline-is-crlf or --enable-newline-is-anycrlf or
191      --enable-newline-is-any to the "configure" command, respectively.
192    
193      If you specify --enable-newline-is-cr or --enable-newline-is-crlf, some of
194      the standard tests will fail, because the lines in the test files end with
195      LF. Even if the files are edited to change the line endings, there are likely
196      to be some failures. With --enable-newline-is-anycrlf or
197      --enable-newline-is-any, many tests should succeed, but there may be some
198      failures.
199    
200    . By default, the sequence \R in a pattern matches any Unicode line ending
201      sequence. This is independent of the option specifying what PCRE considers to
202      be the end of a line (see above). However, the caller of PCRE can restrict \R
203      to match only CR, LF, or CRLF. You can make this the default by adding
204      --enable-bsr-anycrlf to the "configure" command (bsr = "backslash R").
205    
206    . When called via the POSIX interface, PCRE uses malloc() to get additional
207      storage for processing capturing parentheses if there are more than 10 of
208      them in a pattern. You can increase this threshold by setting, for example,
209    
210      --with-posix-malloc-threshold=20
211    
212      on the "configure" command.
213    
214    . PCRE has a counter that can be set to limit the amount of resources it uses.
215      If the limit is exceeded during a match, the match fails. The default is ten
216      million. You can change the default by setting, for example,
217    
218      --with-match-limit=500000
219    
220      on the "configure" command. This is just the default; individual calls to
221      pcre_exec() can supply their own value. There is more discussion on the
222      pcreapi man page.
223    
224    . There is a separate counter that limits the depth of recursive function calls
225      during a matching process. This also has a default of ten million, which is
226      essentially "unlimited". You can change the default by setting, for example,
227    
228      --with-match-limit-recursion=500000
229    
230      Recursive function calls use up the runtime stack; running out of stack can
231      cause programs to crash in strange ways. There is a discussion about stack
232      sizes in the pcrestack man page.
233    
234    . The default maximum compiled pattern size is around 64K. You can increase
235      this by adding --with-link-size=3 to the "configure" command. You can
236      increase it even more by setting --with-link-size=4, but this is unlikely
237      ever to be necessary. Increasing the internal link size will reduce
238      performance.
239    
240    . You can build PCRE so that its internal match() function that is called from
241      pcre_exec() does not call itself recursively. Instead, it uses memory blocks
242      obtained from the heap via the special functions pcre_stack_malloc() and
243      pcre_stack_free() to save data that would otherwise be saved on the stack. To
244      build PCRE like this, use
245    
246      --disable-stack-for-recursion
247    
248      on the "configure" command. PCRE runs more slowly in this mode, but it may be
249      necessary in environments with limited stack sizes. This applies only to the
250      pcre_exec() function; it does not apply to pcre_dfa_exec(), which does not
251      use deeply nested recursion. There is a discussion about stack sizes in the
252      pcrestack man page.
253    
254    . For speed, PCRE uses four tables for manipulating and identifying characters
255      whose code point values are less than 256. By default, it uses a set of
256      tables for ASCII encoding that is part of the distribution. If you specify
257    
258      --enable-rebuild-chartables
259    
260      a program called dftables is compiled and run in the default C locale when
261      you obey "make". It builds a source file called pcre_chartables.c. If you do
262      not specify this option, pcre_chartables.c is created as a copy of
263      pcre_chartables.c.dist. See "Character tables" below for further information.
264    
265    . It is possible to compile PCRE for use on systems that use EBCDIC as their
266      character code (as opposed to ASCII) by specifying
267    
268      --enable-ebcdic
269    
270      This automatically implies --enable-rebuild-chartables (see above). However,
271      when PCRE is built this way, it always operates in EBCDIC. It cannot support
272      both EBCDIC and UTF-8.
273    
274    . It is possible to compile pcregrep to use libz and/or libbz2, in order to
275      read .gz and .bz2 files (respectively), by specifying one or both of
276    
277      --enable-pcregrep-libz
278      --enable-pcregrep-libbz2
279    
280      Of course, the relevant libraries must be installed on your system.
281    
282    . It is possible to compile pcretest so that it links with the libreadline
283      library, by specifying
284    
285      --enable-pcretest-libreadline
286    
287      If this is done, when pcretest's input is from a terminal, it reads it using
288      the readline() function. This provides line-editing and history facilities.
289      Note that libreadline is GPL-licenced, so if you distribute a binary of
290      pcretest linked in this way, there may be licensing issues.
291    
292      Setting this option causes the -lreadline option to be added to the pcretest
293      build. In many operating environments with a sytem-installed readline
294      library this is sufficient. However, in some environments (e.g. if an
295      unmodified distribution version of readline is in use), it may be necessary
296      to specify something like LIBS="-lncurses" as well. This is because, to quote
297      the readline INSTALL, "Readline uses the termcap functions, but does not link
298      with the termcap or curses library itself, allowing applications which link
299      with readline the to choose an appropriate library." If you get error
300      messages about missing functions tgetstr, tgetent, tputs, tgetflag, or tgoto,
301      this is the problem, and linking with the ncurses library should fix it.
302    
303    The "configure" script builds the following files for the basic C library:
304    
305    . Makefile is the makefile that builds the library
306    . config.h contains build-time configuration options for the library
307    . pcre.h is the public PCRE header file
308    . pcre-config is a script that shows the settings of "configure" options
309    . libpcre.pc is data for the pkg-config command
310    . libtool is a script that builds shared and/or static libraries
311    . RunTest is a script for running tests on the basic C library
312    . RunGrepTest is a script for running tests on the pcregrep command
313    
314    Versions of config.h and pcre.h are distributed in the PCRE tarballs under
315    the names config.h.generic and pcre.h.generic. These are provided for the
316    benefit of those who have to built PCRE without the benefit of "configure". If
317    you use "configure", the .generic versions are not used.
318    
319    If a C++ compiler is found, the following files are also built:
320    
321    . libpcrecpp.pc is data for the pkg-config command
322    . pcrecpparg.h is a header file for programs that call PCRE via the C++ wrapper
323    . pcre_stringpiece.h is the header for the C++ "stringpiece" functions
324    
325    The "configure" script also creates config.status, which is an executable
326    script that can be run to recreate the configuration, and config.log, which
327    contains compiler output from tests that "configure" runs.
328    
329    Once "configure" has run, you can run "make". It builds two libraries, called
330    libpcre and libpcreposix, a test program called pcretest, and the pcregrep
331    command. If a C++ compiler was found on your system, "make" also builds the C++
332    wrapper library, which is called libpcrecpp, and some test programs called
333    pcrecpp_unittest, pcre_scanner_unittest, and pcre_stringpiece_unittest.
334    Building the C++ wrapper can be disabled by adding --disable-cpp to the
335    "configure" command.
336    
337    The command "make check" runs all the appropriate tests. Details of the PCRE
338    tests are given below in a separate section of this document.
339    
340    You can use "make install" to install PCRE into live directories on your
341    system. The following are installed (file names are all relative to the
342    <prefix> that is set when "configure" is run):
343    
344      Commands (bin):
345        pcretest
346        pcregrep
347        pcre-config
348    
349      Libraries (lib):
350        libpcre
351        libpcreposix
352        libpcrecpp (if C++ support is enabled)
353    
354      Configuration information (lib/pkgconfig):
355        libpcre.pc
356        libpcrecpp.pc (if C++ support is enabled)
357    
358      Header files (include):
359        pcre.h
360        pcreposix.h
361        pcre_scanner.h      )
362        pcre_stringpiece.h  ) if C++ support is enabled
363        pcrecpp.h           )
364        pcrecpparg.h        )
365    
366      Man pages (share/man/man{1,3}):
367        pcregrep.1
368        pcretest.1
369        pcre.3
370        pcre*.3 (lots more pages, all starting "pcre")
371    
372      HTML documentation (share/doc/pcre/html):
373        index.html
374        *.html (lots more pages, hyperlinked from index.html)
375    
376      Text file documentation (share/doc/pcre):
377        AUTHORS
378        COPYING
379        ChangeLog
380        LICENCE
381        NEWS
382        README
383        pcre.txt       (a concatenation of the man(3) pages)
384        pcretest.txt   the pcretest man page
385        pcregrep.txt   the pcregrep man page
386    
387    If you want to remove PCRE from your system, you can run "make uninstall".
388    This removes all the files that "make install" installed. However, it does not
389    remove any directories, because these are often shared with other programs.
390    
391    
392    Retrieving configuration information on Unix-like systems
393    ---------------------------------------------------------
394    
395    Running "make install" installs the command pcre-config, which can be used to
396    recall information about the PCRE configuration and installation. For example:
397    
398      pcre-config --version
399    
400    prints the version number, and
401    
402      pcre-config --libs
403    
404    outputs information about where the library is installed. This command can be
405    included in makefiles for programs that use PCRE, saving the programmer from
406    having to remember too many details.
407    
408    The pkg-config command is another system for saving and retrieving information
409    about installed libraries. Instead of separate commands for each library, a
410    single command is used. For example:
411    
412      pkg-config --cflags pcre
413    
414    The data is held in *.pc files that are installed in a directory called
415    <prefix>/lib/pkgconfig.
416    
417    
418    Shared libraries on Unix-like systems
419    -------------------------------------
420    
421    The default distribution builds PCRE as shared libraries and static libraries,
422    as long as the operating system supports shared libraries. Shared library
423    support relies on the "libtool" script which is built as part of the
424    "configure" process.
425    
426    The libtool script is used to compile and link both shared and static
427    libraries. They are placed in a subdirectory called .libs when they are newly
428    built. The programs pcretest and pcregrep are built to use these uninstalled
429    libraries (by means of wrapper scripts in the case of shared libraries). When
430    you use "make install" to install shared libraries, pcregrep and pcretest are
431    automatically re-built to use the newly installed shared libraries before being
432    installed themselves. However, the versions left in the build directory still
433    use the uninstalled libraries.
434    
435    To build PCRE using static libraries only you must use --disable-shared when
436    configuring it. For example:
437    
438    ./configure --prefix=/usr/gnu --disable-shared
439    
440    Then run "make" in the usual way. Similarly, you can use --disable-static to
441    build only shared libraries.
442    
443    
444    Cross-compiling on Unix-like systems
445    ------------------------------------
446    
447    You can specify CC and CFLAGS in the normal way to the "configure" command, in
448    order to cross-compile PCRE for some other host. However, you should NOT
449    specify --enable-rebuild-chartables, because if you do, the dftables.c source
450    file is compiled and run on the local host, in order to generate the inbuilt
451    character tables (the pcre_chartables.c file). This will probably not work,
452    because dftables.c needs to be compiled with the local compiler, not the cross
453    compiler.
454    
455    When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
456    by making a copy of pcre_chartables.c.dist, which is a default set of tables
457    that assumes ASCII code. Cross-compiling with the default tables should not be
458    a problem.
459    
460    If you need to modify the character tables when cross-compiling, you should
461    move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
462    run it on the local host to make a new version of pcre_chartables.c.dist.
463    Then when you cross-compile PCRE this new version of the tables will be used.
464    
465    
466    Using HP's ANSI C++ compiler (aCC)
467    ----------------------------------
468    
469    Unless C++ support is disabled by specifying the "--disable-cpp" option of the
470    "configure" script, you must include the "-AA" option in the CXXFLAGS
471    environment variable in order for the C++ components to compile correctly.
472    
473    Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
474    needed libraries fail to get included when specifying the "-AA" compiler
475    option. If you experience unresolved symbols when linking the C++ programs,
476    use the workaround of specifying the following environment variable prior to
477    running the "configure" script:
478    
479      CXXLDFLAGS="-lstd_v2 -lCsup_v2"
480    
481    
482    Using PCRE from MySQL
483    ---------------------
484    
485    On systems where both PCRE and MySQL are installed, it is possible to make use
486    of PCRE from within MySQL, as an alternative to the built-in pattern matching.
487    There is a web page that tells you how to do this:
488    
489      http://www.mysqludf.org/lib_mysqludf_preg/index.php
490    
491    
492    Making new tarballs
493    -------------------
494    
495    The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
496    zip formats. The command "make distcheck" does the same, but then does a trial
497    build of the new distribution to ensure that it works.
498    
499    If you have modified any of the man page sources in the doc directory, you
500    should first run the PrepareRelease script before making a distribution. This
501    script creates the .txt and HTML forms of the documentation from the man pages.
502    
503    
504  Testing PCRE  Testing PCRE
505  ------------  ------------
506    
507  To test PCRE on a Unix system, run the RunTest script in the pcre directory.  To test the basic PCRE library on a Unix system, run the RunTest script that is
508  (This can also be run by "make runtest" or "make check".) For other systems,  created by the configuring process. There is also a script called RunGrepTest
509  see the instruction in NON-UNIX-USE.  that tests the options of the pcregrep command. If the C++ wrapper library is
510    built, three test programs called pcrecpp_unittest, pcre_scanner_unittest, and
511    pcre_stringpiece_unittest are also built.
512    
513  The script runs the pcretest test program (which is documented in  Both the scripts and all the program tests are run if you obey "make check" or
514  doc/pcretest.txt) on each of the testinput files (in the testdata directory) in  "make test". For other systems, see the instructions in NON-UNIX-USE.
515    
516    The RunTest script runs the pcretest test program (which is documented in its
517    own man page) on each of the testinput files in the testdata directory in
518  turn, and compares the output with the contents of the corresponding testoutput  turn, and compares the output with the contents of the corresponding testoutput
519  file. A file called testtry is used to hold the output from pcretest. To run  files. A file called testtry is used to hold the main output from pcretest
520  pcretest on just one of the test files, give its number as an argument to  (testsavedregex is also used as a working file). To run pcretest on just one of
521  RunTest, for example:  the test files, give its number as an argument to RunTest, for example:
522    
523    RunTest 3    RunTest 2
524    
525  The first and third test files can also be fed directly into the perltest  The first test file can also be fed directly into the perltest.pl script to
526  script to check that Perl gives the same results. The third file requires the  check that Perl gives the same results. The only difference you should see is
527  additional features of release 5.005, which is why it is kept separate from the  in the first few lines, where the Perl version is given instead of the PCRE
528  main test input, which needs only Perl 5.004. In the long run, when 5.005 is  version.
529  widespread, these two test files may get amalgamated.  
530    The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),
531  The second set of tests check pcre_info(), pcre_study(), pcre_copy_substring(),  pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
532  pcre_get_substring(), pcre_get_substring_list(), error detection and run-time  detection, and run-time flags that are specific to PCRE, as well as the POSIX
533  flags that are specific to PCRE, as well as the POSIX wrapper API.  wrapper API. It also uses the debugging flags to check some of the internals of
534    pcre_compile().
535    
536    If you build PCRE with a locale setting that is not the standard C locale, the
537    character tables may be different (see next paragraph). In some cases, this may
538    cause failures in the second set of tests. For example, in a locale where the
539    isprint() function yields TRUE for characters in the range 128-255, the use of
540    [:isascii:] inside a character class defines a different set of characters, and
541    this shows up in this test as a difference in the compiled code, which is being
542    listed for checking. Where the comparison test output contains [\x00-\x7f] the
543    test will contain [\x00-\xff], and similarly in some other cases. This is not a
544    bug in PCRE.
545    
546  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
547  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
548  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
549  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
550  "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"
551  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
552  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
553    
554    ** Failed to set locale "fr"    ** Failed to set locale "fr_FR"
555    
556  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,
557  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.
558    
559  PCRE has its own native API, but a set of "wrapper" functions that are based on  [If you are trying to run this test on Windows, you may be able to get it to
560  the POSIX API are also supplied in the library libpcreposix.a. Note that this  work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
561  just provides a POSIX calling interface to PCRE: the regular expressions  RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
562  themselves still follow Perl syntax and semantics. The header file  Windows versions of test 2. More info on using RunTest.bat is included in the
563  for the POSIX-style functions is called pcreposix.h. The official POSIX name is  document entitled NON-UNIX-USE.]
564  regex.h, but I didn't want to risk possible problems with existing files of  
565  that name by distributing it that way. To use it with an existing program that  The fourth test checks the UTF-8 support. It is not run automatically unless
566  uses the POSIX API, it will have to be renamed or pointed at by a link.  PCRE is built with UTF-8 support. To do this you must set --enable-utf8 when
567    running "configure". This file can be also fed directly to the perltest.pl
568    script, provided you are running Perl 5.8 or higher.
569    
570    The fifth test checks error handling with UTF-8 encoding, and internal UTF-8
571    features of PCRE that are not relevant to Perl.
572    
573    The sixth test (which is Perl-5.10 compatible) checks the support for Unicode
574    character properties. It it not run automatically unless PCRE is built with
575    Unicode property support. To to this you must set --enable-unicode-properties
576    when running "configure".
577    
578    The seventh, eighth, and ninth tests check the pcre_dfa_exec() alternative
579    matching function, in non-UTF-8 mode, UTF-8 mode, and UTF-8 mode with Unicode
580    property support, respectively. The eighth and ninth tests are not run
581    automatically unless PCRE is build with the relevant support.
582    
583    The tenth test checks some internal offsets and code size features; it is run
584    only when the default "link size" of 2 is set (in other cases the sizes
585    change).
586    
587    The eleventh test checks out features that are new in Perl 5.10, and the
588    twelfth test checks a number internals and non-Perl features concerned with
589    Unicode property support. It it not run automatically unless PCRE is built with
590    Unicode property support. To to this you must set --enable-unicode-properties
591    when running "configure".
592    
593    
594  Character tables  Character tables
595  ----------------  ----------------
596    
597  PCRE uses four tables for manipulating and identifying characters. The final  For speed, PCRE uses four tables for manipulating and identifying characters
598  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
599  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
600  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
601  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
602  the binary is used.  passed as NULL, a set of default tables that is built into the binary is used.
603    
604  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
605  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
606  (compiled from dftables.c), which uses the ANSI C character handling functions  tables for ASCII coding. However, if --enable-rebuild-chartables is specified
607  such as isalnum(), isalpha(), isupper(), islower(), etc. to build the table  for ./configure, a different version of pcre_chartables.c is built by the
608  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
609  control the contents of these default tables. You can change the default tables  handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
610  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
611  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
612  re-generated.  the default tables by editing pcre_chartables.c and then re-building PCRE. If
613    you do this, you should take care to ensure that the file does not get
614    automatically re-generated. The best way to do this is to move
615    pcre_chartables.c.dist out of the way and replace it with your customized
616    tables.
617    
618    When the dftables program is run as a result of --enable-rebuild-chartables,
619    it uses the default C locale that is set on your system. It does not pay
620    attention to the LC_xxx environment variables. In other words, it uses the
621    system's default locale rather than whatever the compiling user happens to have
622    set. If you really do want to build a source set of character tables in a
623    locale that is specified by the LC_xxx variables, you can run the dftables
624    program by hand with the -L option. For example:
625    
626      ./dftables -L pcre_chartables.c.special
627    
628  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,
629  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
630  digits, "word" characters, and white space, respectively. These are used when  digits, "word" characters, and white space, respectively. These are used when
631  building 32-byte bit maps that represent character classes.  building 32-byte bit maps that represent character classes for code points less
632    than 256.
633    
634  The final 256-byte table has bits indicating various character types, as  The final 256-byte table has bits indicating various character types, as
635  follows:  follows:
# Line 145  You should not alter the set of characte Line 645  You should not alter the set of characte
645  will cause PCRE to malfunction.  will cause PCRE to malfunction.
646    
647    
648  Manifest  File manifest
649  --------  -------------
650    
651  The distribution should contain the following files:  The distribution should contain the following files:
652    
653  (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.h                header for the external API  
   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  
   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               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/pgrep.1           man page source for the pgrep utility  
   doc/pgrep.html        HTML version  
   doc/pgrep.txt         plain text version  
   install-sh            a shell script for installing files  
   ltconfig              ) files used to build "libtool",  
   ltmain.sh             )   used only when building a shared library  
   pcretest.c            test program  
   perltest              Perl test program  
   pgrep.c               source of a grep utility that uses PCRE  
   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/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  
   
 (C) Auxiliary files for Win32 DLL  
654    
655    dll.mk    dftables.c              auxiliary program for building pcre_chartables.c
656    pcre.def                              when --enable-rebuild-chartables is specified
657    
658  Philip Hazel <ph10@cam.ac.uk>    pcre_chartables.c.dist  a default set of character tables that assume ASCII
659  January 2000                              coding; used, unless --enable-rebuild-chartables is
660                                specified, by copying to pcre_chartables.c
661    
662      pcreposix.c             )
663      pcre_compile.c          )
664      pcre_config.c           )
665      pcre_dfa_exec.c         )
666      pcre_exec.c             )
667      pcre_fullinfo.c         )
668      pcre_get.c              ) sources for the functions in the library,
669      pcre_globals.c          )   and some internal functions that they use
670      pcre_info.c             )
671      pcre_maketables.c       )
672      pcre_newline.c          )
673      pcre_ord2utf8.c         )
674      pcre_refcount.c         )
675      pcre_study.c            )
676      pcre_tables.c           )
677      pcre_try_flipped.c      )
678      pcre_ucd.c              )
679      pcre_valid_utf8.c       )
680      pcre_version.c          )
681      pcre_xclass.c           )
682      pcre_printint.src       ) debugging function that is #included in pcretest,
683                              )   and can also be #included in pcre_compile()
684      pcre.h.in               template for pcre.h when built by "configure"
685      pcreposix.h             header for the external POSIX wrapper API
686      pcre_internal.h         header for internal use
687      ucp.h                   header for Unicode property handling
688    
689      config.h.in             template for config.h, which is built by "configure"
690    
691      pcrecpp.h               public header file for the C++ wrapper
692      pcrecpparg.h.in         template for another C++ header file
693      pcre_scanner.h          public header file for C++ scanner functions
694      pcrecpp.cc              )
695      pcre_scanner.cc         ) source for the C++ wrapper library
696    
697      pcre_stringpiece.h.in   template for pcre_stringpiece.h, the header for the
698                                C++ stringpiece functions
699      pcre_stringpiece.cc     source for the C++ stringpiece functions
700    
701    (B) Source files for programs that use PCRE:
702    
703      pcredemo.c              simple demonstration of coding calls to PCRE
704      pcregrep.c              source of a grep utility that uses PCRE
705      pcretest.c              comprehensive test program
706    
707    (C) Auxiliary files:
708    
709      132html                 script to turn "man" pages into HTML
710      AUTHORS                 information about the author of PCRE
711      ChangeLog               log of changes to the code
712      CleanTxt                script to clean nroff output for txt man pages
713      Detrail                 script to remove trailing spaces
714      HACKING                 some notes about the internals of PCRE
715      INSTALL                 generic installation instructions
716      LICENCE                 conditions for the use of PCRE
717      COPYING                 the same, using GNU's standard name
718      Makefile.in             ) template for Unix Makefile, which is built by
719                              )   "configure"
720      Makefile.am             ) the automake input that was used to create
721                              )   Makefile.in
722      NEWS                    important changes in this release
723      NON-UNIX-USE            notes on building PCRE on non-Unix systems
724      PrepareRelease          script to make preparations for "make dist"
725      README                  this file
726      RunTest                 a Unix shell script for running tests
727      RunGrepTest             a Unix shell script for pcregrep tests
728      aclocal.m4              m4 macros (generated by "aclocal")
729      config.guess            ) files used by libtool,
730      config.sub              )   used only when building a shared library
731      configure               a configuring shell script (built by autoconf)
732      configure.ac            ) the autoconf input that was used to build
733                              )   "configure" and config.h
734      depcomp                 ) script to find program dependencies, generated by
735                              )   automake
736      doc/*.3                 man page sources for PCRE
737      doc/*.1                 man page sources for pcregrep and pcretest
738      doc/index.html.src      the base HTML page
739      doc/html/*              HTML documentation
740      doc/pcre.txt            plain text version of the man pages
741      doc/pcretest.txt        plain text documentation of test program
742      doc/perltest.txt        plain text documentation of Perl test program
743      install-sh              a shell script for installing files
744      libpcre.pc.in           template for libpcre.pc for pkg-config
745      libpcreposix.pc.in      template for libpcreposix.pc for pkg-config
746      libpcrecpp.pc.in        template for libpcrecpp.pc for pkg-config
747      ltmain.sh               file used to build a libtool script
748      missing                 ) common stub for a few missing GNU programs while
749                              )   installing, generated by automake
750      mkinstalldirs           script for making install directories
751      perltest.pl             Perl test program
752      pcre-config.in          source of script which retains PCRE information
753      pcrecpp_unittest.cc          )
754      pcre_scanner_unittest.cc     ) test programs for the C++ wrapper
755      pcre_stringpiece_unittest.cc )
756      testdata/testinput*     test data for main library tests
757      testdata/testoutput*    expected test results
758      testdata/grep*          input and output for pcregrep tests
759    
760    (D) Auxiliary files for cmake support
761    
762      cmake/COPYING-CMAKE-SCRIPTS
763      cmake/FindPackageHandleStandardArgs.cmake
764      cmake/FindReadline.cmake
765      CMakeLists.txt
766      config-cmake.h.in
767    
768    (E) Auxiliary files for VPASCAL
769    
770      makevp.bat
771      makevp_c.txt
772      makevp_l.txt
773      pcregexp.pas
774    
775    (F) Auxiliary files for building PCRE "by hand"
776    
777      pcre.h.generic          ) a version of the public PCRE header file
778                              )   for use in non-"configure" environments
779      config.h.generic        ) a version of config.h for use in non-"configure"
780                              )   environments
781    
782    (F) Miscellaneous
783    
784      RunTest.bat            a script for running tests under Windows
785    
786    Philip Hazel
787    Email local part: ph10
788    Email domain: cam.ac.uk
789    Last updated: 05 October 2009

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