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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 from  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    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      Making new tarballs
28      Testing PCRE
29      Character tables
30      File manifest
31    
32    
33    The PCRE APIs
34    -------------
35    
36    PCRE is written in C, and it has its own API. The distribution also includes a
37    set of C++ wrapper functions (see the pcrecpp man page for details), courtesy
38    of Google Inc.
39    
40    In addition, there is a set of C wrapper functions that are based on the POSIX
41    regular expression API (see the pcreposix man page). These end up in the
42    library called libpcreposix. Note that this just provides a POSIX calling
43    interface to PCRE; the regular expressions themselves still follow Perl syntax
44    and semantics. The POSIX API is restricted, and does not give full access to
45    all of PCRE's facilities.
46    
47    The header file for the POSIX-style functions is called pcreposix.h. The
48    official POSIX name is regex.h, but I did not want to risk possible problems
49    with existing files of that name by distributing it that way. To use PCRE with
50    an existing program that uses the POSIX API, pcreposix.h will have to be
51    renamed or pointed at by a link.
52    
53    If you are using the POSIX interface to PCRE and there is already a POSIX regex
54    library installed on your system, as well as worrying about the regex.h header
55    file (as mentioned above), you must also take care when linking programs to
56    ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
57    up the POSIX functions of the same name from the other library.
58    
59    One way of avoiding this confusion is to compile PCRE with the addition of
60    -Dregcomp=PCREregcomp (and similarly for the other POSIX functions) to the
61    compiler flags (CFLAGS if you are using "configure" -- see below). This has the
62    effect of renaming the functions so that the names no longer clash. Of course,
63    you have to do the same thing for your applications, or write them using the
64    new names.
65    
66    
67    Documentation for PCRE
68    ----------------------
69    
70    If you install PCRE in the normal way on a Unix-like system, you will end up
71    with a set of man pages whose names all start with "pcre". The one that is just
72    called "pcre" lists all the others. In addition to these man pages, the PCRE
73    documentation is supplied in two other forms:
74    
75      1. There are files called doc/pcre.txt, doc/pcregrep.txt, and
76         doc/pcretest.txt in the source distribution. The first of these is a
77         concatenation of the text forms of all the section 3 man pages except
78         those that summarize individual functions. The other two are the text
79         forms of the section 1 man pages for the pcregrep and pcretest commands.
80         These text forms are provided for ease of scanning with text editors or
81         similar tools. They are installed in <prefix>/share/doc/pcre, where
82         <prefix> is the installation prefix (defaulting to /usr/local).
83    
84      2. A set of files containing all the documentation in HTML form, hyperlinked
85         in various ways, and rooted in a file called index.html, is distributed in
86         doc/html and installed in <prefix>/share/doc/pcre/html.
87    
88    Users of PCRE have contributed files containing the documentation for various
89    releases in CHM format. These can be found in the Contrib directory of the FTP
90    site (see next section).
91    
92    
93  Building PCRE on a Unix system  Contributions by users of PCRE
94  ------------------------------  ------------------------------
95    
96  To build PCRE on a Unix system, run the "configure" command in the PCRE  You can find contributions from PCRE users in the directory
97  distribution directory. This is a standard GNU "autoconf" configuration script,  
98  for which generic instructions are supplied in INSTALL. On many systems just    ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
99  running "./configure" is sufficient, but the usual methods of changing standard  
100  defaults are available. For example  There is a README file giving brief descriptions of what they are. Some are
101    complete in themselves; others are pointers to URLs containing relevant files.
102    Some of this material is likely to be well out-of-date. Several of the earlier
103    contributions provided support for compiling PCRE on various flavours of
104    Windows (I myself do not use Windows). Nowadays there is more Windows support
105    in the standard distribution, so these contibutions have been archived.
106    
107    
108    Building PCRE on non-Unix systems
109    ---------------------------------
110    
111    For a non-Unix system, please read the comments in the file NON-UNIX-USE,
112    though if your system supports the use of "configure" and "make" you may be
113    able to build PCRE in the same way as for Unix-like systems. PCRE can also be
114    configured in many platform environments using the GUI facility of CMake's
115    CMakeSetup. It creates Makefiles, solution files, etc.
116    
117    PCRE has been compiled on many different operating systems. It should be
118    straightforward to build PCRE on any system that has a Standard C compiler and
119    library, because it uses only Standard C functions.
120    
121    
122    Building PCRE on Unix-like systems
123    ----------------------------------
124    
125    If you are using HP's ANSI C++ compiler (aCC), please see the special note
126    in the section entitled "Using HP's ANSI C++ compiler (aCC)" below.
127    
128    The following instructions assume the use of the widely used "configure, make,
129    make install" process. There is also support for CMake in the PCRE
130    distribution; there are some comments about using CMake in the NON-UNIX-USE
131    file, though it can also be used in Unix-like systems.
132    
133    To build PCRE on a Unix-like system, first run the "configure" command from the
134    PCRE distribution directory, with your current directory set to the directory
135    where you want the files to be created. This command is a standard GNU
136    "autoconf" configuration script, for which generic instructions are supplied in
137    the file INSTALL.
138    
139    Most commonly, people build PCRE within its own distribution directory, and in
140    this case, on many systems, just running "./configure" is sufficient. However,
141    the usual methods of changing standard defaults are available. For example:
142    
143  CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local  CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
144    
145  specifies that the C compiler should be run with the flags '-O2 -Wall' instead  specifies that the C compiler should be run with the flags '-O2 -Wall' instead
146  of the default, and that "make install" should install PCRE under /opt/local  of the default, and that "make install" should install PCRE under /opt/local
147  instead of the default /usr/local. The "configure" script builds thre files:  instead of the default /usr/local.
148    
149    If you want to build in a different directory, just run "configure" with that
150    directory as current. For example, suppose you have unpacked the PCRE source
151    into /source/pcre/pcre-xxx, but you want to build it in /build/pcre/pcre-xxx:
152    
153    cd /build/pcre/pcre-xxx
154    /source/pcre/pcre-xxx/configure
155    
156    PCRE is written in C and is normally compiled as a C library. However, it is
157    possible to build it as a C++ library, though the provided building apparatus
158    does not have any features to support this.
159    
160    There are some optional features that can be included or omitted from the PCRE
161    library. You can read more about them in the pcrebuild man page.
162    
163    . If you want to suppress the building of the C++ wrapper library, you can add
164      --disable-cpp to the "configure" command. Otherwise, when "configure" is run,
165      it will try to find a C++ compiler and C++ header files, and if it succeeds,
166      it will try to build the C++ wrapper.
167    
168    . If you want to make use of the support for UTF-8 Unicode character strings in
169      PCRE, you must add --enable-utf8 to the "configure" command. Without it, the
170      code for handling UTF-8 is not included in the library. Even when included,
171      it still has to be enabled by an option at run time. When PCRE is compiled
172      with this option, its input can only either be ASCII or UTF-8, even when
173      running on EBCDIC platforms. It is not possible to use both --enable-utf8 and
174      --enable-ebcdic at the same time.
175    
176    . If, in addition to support for UTF-8 character strings, you want to include
177      support for the \P, \p, and \X sequences that recognize Unicode character
178      properties, you must add --enable-unicode-properties to the "configure"
179      command. This adds about 30K to the size of the library (in the form of a
180      property table); only the basic two-letter properties such as Lu are
181      supported.
182    
183    . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
184      of the preceding, or any of the Unicode newline sequences as indicating the
185      end of a line. Whatever you specify at build time is the default; the caller
186      of PCRE can change the selection at run time. The default newline indicator
187      is a single LF character (the Unix standard). You can specify the default
188      newline indicator by adding --enable-newline-is-cr or --enable-newline-is-lf
189      or --enable-newline-is-crlf or --enable-newline-is-anycrlf or
190      --enable-newline-is-any to the "configure" command, respectively.
191    
192      If you specify --enable-newline-is-cr or --enable-newline-is-crlf, some of
193      the standard tests will fail, because the lines in the test files end with
194      LF. Even if the files are edited to change the line endings, there are likely
195      to be some failures. With --enable-newline-is-anycrlf or
196      --enable-newline-is-any, many tests should succeed, but there may be some
197      failures.
198    
199    . By default, the sequence \R in a pattern matches any Unicode line ending
200      sequence. This is independent of the option specifying what PCRE considers to
201      be the end of a line (see above). However, the caller of PCRE can restrict \R
202      to match only CR, LF, or CRLF. You can make this the default by adding
203      --enable-bsr-anycrlf to the "configure" command (bsr = "backslash R").
204    
205    . When called via the POSIX interface, PCRE uses malloc() to get additional
206      storage for processing capturing parentheses if there are more than 10 of
207      them in a pattern. You can increase this threshold by setting, for example,
208    
209      --with-posix-malloc-threshold=20
210    
211      on the "configure" command.
212    
213    . PCRE has a counter that can be set to limit the amount of resources it uses.
214      If the limit is exceeded during a match, the match fails. The default is ten
215      million. You can change the default by setting, for example,
216    
217      --with-match-limit=500000
218    
219      on the "configure" command. This is just the default; individual calls to
220      pcre_exec() can supply their own value. There is more discussion on the
221      pcreapi man page.
222    
223    . There is a separate counter that limits the depth of recursive function calls
224      during a matching process. This also has a default of ten million, which is
225      essentially "unlimited". You can change the default by setting, for example,
226    
227      --with-match-limit-recursion=500000
228    
229      Recursive function calls use up the runtime stack; running out of stack can
230      cause programs to crash in strange ways. There is a discussion about stack
231      sizes in the pcrestack man page.
232    
233    . The default maximum compiled pattern size is around 64K. You can increase
234      this by adding --with-link-size=3 to the "configure" command. You can
235      increase it even more by setting --with-link-size=4, but this is unlikely
236      ever to be necessary. Increasing the internal link size will reduce
237      performance.
238    
239    . You can build PCRE so that its internal match() function that is called from
240      pcre_exec() does not call itself recursively. Instead, it uses memory blocks
241      obtained from the heap via the special functions pcre_stack_malloc() and
242      pcre_stack_free() to save data that would otherwise be saved on the stack. To
243      build PCRE like this, use
244    
245      --disable-stack-for-recursion
246    
247      on the "configure" command. PCRE runs more slowly in this mode, but it may be
248      necessary in environments with limited stack sizes. This applies only to the
249      pcre_exec() function; it does not apply to pcre_dfa_exec(), which does not
250      use deeply nested recursion. There is a discussion about stack sizes in the
251      pcrestack man page.
252    
253    . For speed, PCRE uses four tables for manipulating and identifying characters
254      whose code point values are less than 256. By default, it uses a set of
255      tables for ASCII encoding that is part of the distribution. If you specify
256    
257      --enable-rebuild-chartables
258    
259      a program called dftables is compiled and run in the default C locale when
260      you obey "make". It builds a source file called pcre_chartables.c. If you do
261      not specify this option, pcre_chartables.c is created as a copy of
262      pcre_chartables.c.dist. See "Character tables" below for further information.
263    
264    . It is possible to compile PCRE for use on systems that use EBCDIC as their
265      character code (as opposed to ASCII) by specifying
266    
267      --enable-ebcdic
268    
269      This automatically implies --enable-rebuild-chartables (see above). However,
270      when PCRE is built this way, it always operates in EBCDIC. It cannot support
271      both EBCDIC and UTF-8.
272    
273    . It is possible to compile pcregrep to use libz and/or libbz2, in order to
274      read .gz and .bz2 files (respectively), by specifying one or both of
275    
276      --enable-pcregrep-libz
277      --enable-pcregrep-libbz2
278    
279      Of course, the relevant libraries must be installed on your system.
280    
281    . It is possible to compile pcretest so that it links with the libreadline
282      library, by specifying
283    
284      --enable-pcretest-libreadline
285    
286      If this is done, when pcretest's input is from a terminal, it reads it using
287      the readline() function. This provides line-editing and history facilities.
288      Note that libreadline is GPL-licenced, so if you distribute a binary of
289      pcretest linked in this way, there may be licensing issues.
290    
291      Setting this option causes the -lreadline option to be added to the pcretest
292      build. In many operating environments with a sytem-installed readline
293      library this is sufficient. However, in some environments (e.g. if an
294      unmodified distribution version of readline is in use), it may be necessary
295      to specify something like LIBS="-lncurses" as well. This is because, to quote
296      the readline INSTALL, "Readline uses the termcap functions, but does not link
297      with the termcap or curses library itself, allowing applications which link
298      with readline the to choose an appropriate library." If you get error
299      messages about missing functions tgetstr, tgetent, tputs, tgetflag, or tgoto,
300      this is the problem, and linking with the ncurses library should fix it.
301    
302    The "configure" script builds the following files for the basic C library:
303    
304    . Makefile is the makefile that builds the library
305    . config.h contains build-time configuration options for the library
306    . pcre.h is the public PCRE header file
307    . pcre-config is a script that shows the settings of "configure" options
308    . libpcre.pc is data for the pkg-config command
309    . libtool is a script that builds shared and/or static libraries
310    . RunTest is a script for running tests on the basic C library
311    . RunGrepTest is a script for running tests on the pcregrep command
312    
313    Versions of config.h and pcre.h are distributed in the PCRE tarballs under
314    the names config.h.generic and pcre.h.generic. These are provided for the
315    benefit of those who have to built PCRE without the benefit of "configure". If
316    you use "configure", the .generic versions are not used.
317    
318    If a C++ compiler is found, the following files are also built:
319    
320    . libpcrecpp.pc is data for the pkg-config command
321    . pcrecpparg.h is a header file for programs that call PCRE via the C++ wrapper
322    . pcre_stringpiece.h is the header for the C++ "stringpiece" functions
323    
324    The "configure" script also creates config.status, which is an executable
325    script that can be run to recreate the configuration, and config.log, which
326    contains compiler output from tests that "configure" runs.
327    
328    Once "configure" has run, you can run "make". It builds two libraries, called
329    libpcre and libpcreposix, a test program called pcretest, and the pcregrep
330    command. If a C++ compiler was found on your system, "make" also builds the C++
331    wrapper library, which is called libpcrecpp, and some test programs called
332    pcrecpp_unittest, pcre_scanner_unittest, and pcre_stringpiece_unittest.
333    Building the C++ wrapper can be disabled by adding --disable-cpp to the
334    "configure" command.
335    
336    The command "make check" runs all the appropriate tests. Details of the PCRE
337    tests are given below in a separate section of this document.
338    
339    You can use "make install" to install PCRE into live directories on your
340    system. The following are installed (file names are all relative to the
341    <prefix> that is set when "configure" is run):
342    
343      Commands (bin):
344        pcretest
345        pcregrep
346        pcre-config
347    
348      Libraries (lib):
349        libpcre
350        libpcreposix
351        libpcrecpp (if C++ support is enabled)
352    
353      Configuration information (lib/pkgconfig):
354        libpcre.pc
355        libpcrecpp.pc (if C++ support is enabled)
356    
357      Header files (include):
358        pcre.h
359        pcreposix.h
360        pcre_scanner.h      )
361        pcre_stringpiece.h  ) if C++ support is enabled
362        pcrecpp.h           )
363        pcrecpparg.h        )
364    
365      Man pages (share/man/man{1,3}):
366        pcregrep.1
367        pcretest.1
368        pcre.3
369        pcre*.3 (lots more pages, all starting "pcre")
370    
371      HTML documentation (share/doc/pcre/html):
372        index.html
373        *.html (lots more pages, hyperlinked from index.html)
374    
375      Text file documentation (share/doc/pcre):
376        AUTHORS
377        COPYING
378        ChangeLog
379        LICENCE
380        NEWS
381        README
382        pcre.txt       (a concatenation of the man(3) pages)
383        pcretest.txt   the pcretest man page
384        pcregrep.txt   the pcregrep man page
385    
386    If you want to remove PCRE from your system, you can run "make uninstall".
387    This removes all the files that "make install" installed. However, it does not
388    remove any directories, because these are often shared with other programs.
389    
390    
391  . Makefile is built by copying Makefile.in and making substitutions.  Retrieving configuration information on Unix-like systems
392  . config.h is built by copying config.in and making substitutions.  ---------------------------------------------------------
393  . pcre-config is built by copying pcre-config.in and making substitutions.  
394    Running "make install" installs the command pcre-config, which can be used to
395  Once "configure" has run, you can run "make". It builds two libraries called  recall information about the PCRE configuration and installation. For example:
 libpcre and libpcreposix, a test program called pcretest, and the pgrep  
 command. You can use "make install" to copy these, and the public header file  
 pcre.h, 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,  
396    
397    pcre-config --version    pcre-config --version
398    
399  prints the version number, and  prints the version number, and
400    
401   pcre-config --libs    pcre-config --libs
402    
403  outputs information about where the library is installed. This command can be  outputs information about where the library is installed. This command can be
404  included in makefiles for programs that use PCRE, saving the programmer from  included in makefiles for programs that use PCRE, saving the programmer from
405  having to remember too many details.  having to remember too many details.
406    
407    The pkg-config command is another system for saving and retrieving information
408    about installed libraries. Instead of separate commands for each library, a
409    single command is used. For example:
410    
411      pkg-config --cflags pcre
412    
413    The data is held in *.pc files that are installed in a directory called
414    <prefix>/lib/pkgconfig.
415    
416    
417    Shared libraries on Unix-like systems
418    -------------------------------------
419    
420    The default distribution builds PCRE as shared libraries and static libraries,
421    as long as the operating system supports shared libraries. Shared library
422    support relies on the "libtool" script which is built as part of the
423    "configure" process.
424    
425    The libtool script is used to compile and link both shared and static
426    libraries. They are placed in a subdirectory called .libs when they are newly
427    built. The programs pcretest and pcregrep are built to use these uninstalled
428    libraries (by means of wrapper scripts in the case of shared libraries). When
429    you use "make install" to install shared libraries, pcregrep and pcretest are
430    automatically re-built to use the newly installed shared libraries before being
431    installed themselves. However, the versions left in the build directory still
432    use the uninstalled libraries.
433    
434    To build PCRE using static libraries only you must use --disable-shared when
435    configuring it. For example:
436    
437  Shared libraries on Unix systems  ./configure --prefix=/usr/gnu --disable-shared
 --------------------------------  
438    
439  The default distribution builds PCRE as two shared libraries. This support is  Then run "make" in the usual way. Similarly, you can use --disable-static to
440  new and experimental and may not work on all systems. It relies on the  build only shared libraries.
 "libtool" scripts - these are distributed with PCRE. It should build a  
 "libtool" script and use this to compile and link shared libraries, which are  
 placed in a subdirectory called .libs. The programs pcretest and pgrep are  
 built to use these uninstalled libraries by means of wrapper scripts. When you  
 use "make install" to install shared libraries, pgrep and pcretest are  
 automatically re-built to use the newly installed libraries. However, only  
 pgrep is installed, as pcretest is really just a test program.  
441    
 To build PCRE using static libraries you must use --disable-shared when  
 configuring it. For example  
442    
443  ./configure --prefix=/usr/gnu --disable-shared  Cross-compiling on Unix-like systems
444    ------------------------------------
445    
446    You can specify CC and CFLAGS in the normal way to the "configure" command, in
447    order to cross-compile PCRE for some other host. However, you should NOT
448    specify --enable-rebuild-chartables, because if you do, the dftables.c source
449    file is compiled and run on the local host, in order to generate the inbuilt
450    character tables (the pcre_chartables.c file). This will probably not work,
451    because dftables.c needs to be compiled with the local compiler, not the cross
452    compiler.
453    
454    When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
455    by making a copy of pcre_chartables.c.dist, which is a default set of tables
456    that assumes ASCII code. Cross-compiling with the default tables should not be
457    a problem.
458    
459    If you need to modify the character tables when cross-compiling, you should
460    move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
461    run it on the local host to make a new version of pcre_chartables.c.dist.
462    Then when you cross-compile PCRE this new version of the tables will be used.
463    
464    
465  Then run "make" in the usual way.  Using HP's ANSI C++ compiler (aCC)
466    ----------------------------------
467    
468    Unless C++ support is disabled by specifying the "--disable-cpp" option of the
469    "configure" script, you must include the "-AA" option in the CXXFLAGS
470    environment variable in order for the C++ components to compile correctly.
471    
472  Building on non-Unix systems  Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
473  ----------------------------  needed libraries fail to get included when specifying the "-AA" compiler
474    option. If you experience unresolved symbols when linking the C++ programs,
475    use the workaround of specifying the following environment variable prior to
476    running the "configure" script:
477    
478  For a non-Unix system, read the comments in the file NON-UNIX-USE. PCRE has    CXXLDFLAGS="-lstd_v2 -lCsup_v2"
479  been compiled on Windows systems and on Macintoshes, but I don't know the  
480  details because I don't use those systems. It should be straightforward to  
481  build PCRE on any system that has a Standard C compiler, because it uses only  Making new tarballs
482  Standard C functions.  -------------------
483    
484    The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
485    zip formats. The command "make distcheck" does the same, but then does a trial
486    build of the new distribution to ensure that it works.
487    
488    If you have modified any of the man page sources in the doc directory, you
489    should first run the PrepareRelease script before making a distribution. This
490    script creates the .txt and HTML forms of the documentation from the man pages.
491    
492    
493  Testing PCRE  Testing PCRE
494  ------------  ------------
495    
496  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
497  (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
498  see the instruction in NON-UNIX-USE.  that tests the options of the pcregrep command. If the C++ wrapper library is
499    built, three test programs called pcrecpp_unittest, pcre_scanner_unittest, and
500    pcre_stringpiece_unittest are also built.
501    
502  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
503  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.
504    
505    The RunTest script runs the pcretest test program (which is documented in its
506    own man page) on each of the testinput files in the testdata directory in
507  turn, and compares the output with the contents of the corresponding testoutput  turn, and compares the output with the contents of the corresponding testoutput
508  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
509  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
510  RunTest, for example:  the test files, give its number as an argument to RunTest, for example:
511    
512    RunTest 3    RunTest 2
513    
514  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
515  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
516  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
517  main test input, which needs only Perl 5.004. In the long run, when 5.005 is  version.
518  widespread, these two test files may get amalgamated.  
519    The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),
520  The second set of tests check pcre_info(), pcre_study(), pcre_copy_substring(),  pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
521  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
522  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
523    pcre_compile().
524    
525    If you build PCRE with a locale setting that is not the standard C locale, the
526    character tables may be different (see next paragraph). In some cases, this may
527    cause failures in the second set of tests. For example, in a locale where the
528    isprint() function yields TRUE for characters in the range 128-255, the use of
529    [:isascii:] inside a character class defines a different set of characters, and
530    this shows up in this test as a difference in the compiled code, which is being
531    listed for checking. Where the comparison test output contains [\x00-\x7f] the
532    test will contain [\x00-\xff], and similarly in some other cases. This is not a
533    bug in PCRE.
534    
535  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
536  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
537  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
538  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
539  "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"
540  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
541  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
542    
543    ** Failed to set locale "fr"    ** Failed to set locale "fr_FR"
544    
545  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,
546  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.
547    
548  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
549  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
550  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
551  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
552  for the POSIX-style functions is called pcreposix.h. The official POSIX name is  document entitled NON-UNIX-USE.]
553  regex.h, but I didn't want to risk possible problems with existing files of  
554  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
555  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
556    running "configure". This file can be also fed directly to the perltest script,
557    provided you are running Perl 5.8 or higher. (For Perl 5.6, a small patch,
558    commented in the script, can be be used.)
559    
560    The fifth test checks error handling with UTF-8 encoding, and internal UTF-8
561    features of PCRE that are not relevant to Perl.
562    
563    The sixth test checks the support for Unicode character properties. It it not
564    run automatically unless PCRE is built with Unicode property support. To to
565    this you must set --enable-unicode-properties when running "configure".
566    
567    The seventh, eighth, and ninth tests check the pcre_dfa_exec() alternative
568    matching function, in non-UTF-8 mode, UTF-8 mode, and UTF-8 mode with Unicode
569    property support, respectively. The eighth and ninth tests are not run
570    automatically unless PCRE is build with the relevant support.
571    
572    
573  Character tables  Character tables
574  ----------------  ----------------
575    
576  PCRE uses four tables for manipulating and identifying characters. The final  For speed, PCRE uses four tables for manipulating and identifying characters
577  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
578  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
579  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
580  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
581  the binary is used.  passed as NULL, a set of default tables that is built into the binary is used.
582    
583  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
584  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
585  (compiled from dftables.c), which uses the ANSI C character handling functions  tables for ASCII coding. However, if --enable-rebuild-chartables is specified
586  such as isalnum(), isalpha(), isupper(), islower(), etc. to build the table  for ./configure, a different version of pcre_chartables.c is built by the
587  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
588  control the contents of these default tables. You can change the default tables  handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
589  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
590  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
591  re-generated.  the default tables by editing pcre_chartables.c and then re-building PCRE. If
592    you do this, you should take care to ensure that the file does not get
593    automatically re-generated. The best way to do this is to move
594    pcre_chartables.c.dist out of the way and replace it with your customized
595    tables.
596    
597    When the dftables program is run as a result of --enable-rebuild-chartables,
598    it uses the default C locale that is set on your system. It does not pay
599    attention to the LC_xxx environment variables. In other words, it uses the
600    system's default locale rather than whatever the compiling user happens to have
601    set. If you really do want to build a source set of character tables in a
602    locale that is specified by the LC_xxx variables, you can run the dftables
603    program by hand with the -L option. For example:
604    
605      ./dftables -L pcre_chartables.c.special
606    
607  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,
608  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
609  digits, "word" characters, and white space, respectively. These are used when  digits, "word" characters, and white space, respectively. These are used when
610  building 32-byte bit maps that represent character classes.  building 32-byte bit maps that represent character classes for code points less
611    than 256.
612    
613  The final 256-byte table has bits indicating various character types, as  The final 256-byte table has bits indicating various character types, as
614  follows:  follows:
# Line 166  You should not alter the set of characte Line 624  You should not alter the set of characte
624  will cause PCRE to malfunction.  will cause PCRE to malfunction.
625    
626    
627  Manifest  File manifest
628  --------  -------------
629    
630  The distribution should contain the following files:  The distribution should contain the following files:
631    
632  (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               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  
   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/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  
633    
634    dll.mk    dftables.c              auxiliary program for building pcre_chartables.c
635    pcre.def                              when --enable-rebuild-chartables is specified
636    
637  Philip Hazel <ph10@cam.ac.uk>    pcre_chartables.c.dist  a default set of character tables that assume ASCII
638  February 2000                              coding; used, unless --enable-rebuild-chartables is
639                                specified, by copying to pcre_chartables.c
640    
641      pcreposix.c             )
642      pcre_compile.c          )
643      pcre_config.c           )
644      pcre_dfa_exec.c         )
645      pcre_exec.c             )
646      pcre_fullinfo.c         )
647      pcre_get.c              ) sources for the functions in the library,
648      pcre_globals.c          )   and some internal functions that they use
649      pcre_info.c             )
650      pcre_maketables.c       )
651      pcre_newline.c          )
652      pcre_ord2utf8.c         )
653      pcre_refcount.c         )
654      pcre_study.c            )
655      pcre_tables.c           )
656      pcre_try_flipped.c      )
657      pcre_ucd.c              )
658      pcre_valid_utf8.c       )
659      pcre_version.c          )
660      pcre_xclass.c           )
661      pcre_printint.src       ) debugging function that is #included in pcretest,
662                              )   and can also be #included in pcre_compile()
663      pcre.h.in               template for pcre.h when built by "configure"
664      pcreposix.h             header for the external POSIX wrapper API
665      pcre_internal.h         header for internal use
666      ucp.h                   header for Unicode property handling
667    
668      config.h.in             template for config.h, which is built by "configure"
669    
670      pcrecpp.h               public header file for the C++ wrapper
671      pcrecpparg.h.in         template for another C++ header file
672      pcre_scanner.h          public header file for C++ scanner functions
673      pcrecpp.cc              )
674      pcre_scanner.cc         ) source for the C++ wrapper library
675    
676      pcre_stringpiece.h.in   template for pcre_stringpiece.h, the header for the
677                                C++ stringpiece functions
678      pcre_stringpiece.cc     source for the C++ stringpiece functions
679    
680    (B) Source files for programs that use PCRE:
681    
682      pcredemo.c              simple demonstration of coding calls to PCRE
683      pcregrep.c              source of a grep utility that uses PCRE
684      pcretest.c              comprehensive test program
685    
686    (C) Auxiliary files:
687    
688      132html                 script to turn "man" pages into HTML
689      AUTHORS                 information about the author of PCRE
690      ChangeLog               log of changes to the code
691      CleanTxt                script to clean nroff output for txt man pages
692      Detrail                 script to remove trailing spaces
693      HACKING                 some notes about the internals of PCRE
694      INSTALL                 generic installation instructions
695      LICENCE                 conditions for the use of PCRE
696      COPYING                 the same, using GNU's standard name
697      Makefile.in             ) template for Unix Makefile, which is built by
698                              )   "configure"
699      Makefile.am             ) the automake input that was used to create
700                              )   Makefile.in
701      NEWS                    important changes in this release
702      NON-UNIX-USE            notes on building PCRE on non-Unix systems
703      PrepareRelease          script to make preparations for "make dist"
704      README                  this file
705      RunTest                 a Unix shell script for running tests
706      RunGrepTest             a Unix shell script for pcregrep tests
707      aclocal.m4              m4 macros (generated by "aclocal")
708      config.guess            ) files used by libtool,
709      config.sub              )   used only when building a shared library
710      configure               a configuring shell script (built by autoconf)
711      configure.ac            ) the autoconf input that was used to build
712                              )   "configure" and config.h
713      depcomp                 ) script to find program dependencies, generated by
714                              )   automake
715      doc/*.3                 man page sources for the PCRE functions
716      doc/*.1                 man page sources for pcregrep and pcretest
717      doc/index.html.src      the base HTML page
718      doc/html/*              HTML documentation
719      doc/pcre.txt            plain text version of the man pages
720      doc/pcretest.txt        plain text documentation of test program
721      doc/perltest.txt        plain text documentation of Perl test program
722      install-sh              a shell script for installing files
723      libpcre.pc.in           template for libpcre.pc for pkg-config
724      libpcrecpp.pc.in        template for libpcrecpp.pc for pkg-config
725      ltmain.sh               file used to build a libtool script
726      missing                 ) common stub for a few missing GNU programs while
727                              )   installing, generated by automake
728      mkinstalldirs           script for making install directories
729      perltest.pl             Perl test program
730      pcre-config.in          source of script which retains PCRE information
731      pcrecpp_unittest.cc          )
732      pcre_scanner_unittest.cc     ) test programs for the C++ wrapper
733      pcre_stringpiece_unittest.cc )
734      testdata/testinput*     test data for main library tests
735      testdata/testoutput*    expected test results
736      testdata/grep*          input and output for pcregrep tests
737    
738    (D) Auxiliary files for cmake support
739    
740      cmake/COPYING-CMAKE-SCRIPTS
741      cmake/FindPackageHandleStandardArgs.cmake
742      cmake/FindReadline.cmake
743      CMakeLists.txt
744      config-cmake.h.in
745    
746    (E) Auxiliary files for VPASCAL
747    
748      makevp.bat
749      makevp_c.txt
750      makevp_l.txt
751      pcregexp.pas
752    
753    (F) Auxiliary files for building PCRE "by hand"
754    
755      pcre.h.generic          ) a version of the public PCRE header file
756                              )   for use in non-"configure" environments
757      config.h.generic        ) a version of config.h for use in non-"configure"
758                              )   environments
759    
760    (F) Miscellaneous
761    
762      RunTest.bat            a script for running tests under Windows
763    
764    Philip Hazel
765    Email local part: ph10
766    Email domain: cam.ac.uk
767    Last updated: 21 March 2009

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