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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  PCRE has its own native API, but a set of "wrapper" functions that are based on    The PCRE APIs
19  the POSIX API are also supplied in the library libpcreposix. Note that this    Documentation for PCRE
20  just provides a POSIX calling interface to PCRE: the regular expressions    Contributions by users of PCRE
21  themselves still follow Perl syntax and semantics. The header file    Building PCRE on non-Unix systems
22  for the POSIX-style functions is called pcreposix.h. The official POSIX name is    Building PCRE on Unix-like systems
23  regex.h, but I didn't want to risk possible problems with existing files of    Retrieving configuration information on Unix-like systems
24  that name by distributing it that way. To use it with an existing program that    Shared libraries on Unix-like systems
25  uses the POSIX API, it will have to be renamed or pointed at by a link.    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  If you are using the POSIX interface to PCRE and there is already a POSIX regex
55  library installed on your system, you must take care when linking programs to  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  ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
58  up the "real" POSIX functions of the same name.  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  Contributions by users of PCRE  Contributions by users of PCRE
# Line 29  You can find contributions from PCRE use Line 98  You can find contributions from PCRE use
98    
99    ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib    ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
100    
101  where there is also a README file giving brief descriptions of what they are.  There is a README file giving brief descriptions of what they are. Some are
102  Several of them provide support for compiling PCRE on various flavours of  complete in themselves; others are pointers to URLs containing relevant files.
103  Windows systems (I myself do not use Windows). Some are complete in themselves;  Some of this material is likely to be well out-of-date. Several of the earlier
104  others are pointers to URLs containing relevant files.  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  Building PCRE on a Unix-like system  
108  -----------------------------------  
109    Building PCRE on non-Unix systems
110    ---------------------------------
111    
112    For a non-Unix system, please read the comments in the file NON-UNIX-USE,
113    though if your system supports the use of "configure" and "make" you may be
114    able to build PCRE in the same way as for Unix-like systems. PCRE can also be
115    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    
122    
123    Building PCRE on Unix-like systems
124    ----------------------------------
125    
126    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    The following instructions assume the use of the widely used "configure, make,
130    make install" process. There is also support for CMake in the PCRE
131    distribution; there are some comments about using CMake in the NON-UNIX-USE
132    file, though it can also be used in Unix-like systems.
133    
134  To build PCRE on a Unix-like system, first run the "configure" command from the  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  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  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  "autoconf" configuration script, for which generic instructions are supplied in
138  INSTALL.  the file INSTALL.
139    
140  Most commonly, people build PCRE within its own distribution directory, and in  Most commonly, people build PCRE within its own distribution directory, and in
141  this case, on many systems, just running "./configure" is sufficient, but the  this case, on many systems, just running "./configure" is sufficient. However,
142  usual methods of changing standard defaults are available. For example,  the usual methods of changing standard defaults are available. For example:
143    
144  CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local  CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
145    
# Line 61  into /source/pcre/pcre-xxx, but you want Line 154  into /source/pcre/pcre-xxx, but you want
154  cd /build/pcre/pcre-xxx  cd /build/pcre/pcre-xxx
155  /source/pcre/pcre-xxx/configure  /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  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.  library. You can read more about them in the pcrebuild man page.
163    
164  . If you want to make use of the support for UTF-8 character strings in PCRE,  . If you want to suppress the building of the C++ wrapper library, you can add
165    you must add --enable-utf8 to the "configure" command. Without it, the code    --disable-cpp to the "configure" command. Otherwise, when "configure" is run,
166    for handling UTF-8 is not included in the library. (Even when included, it    it will try to find a C++ compiler and C++ header files, and if it succeeds,
167    still has to be enabled by an option at run time.)    it will try to build the C++ wrapper.
168    
169  . You can build PCRE to recognized CR or NL as the newline character, instead  . If you want to make use of the support for UTF-8 Unicode character strings in
170    of whatever your compiler uses for "\n", by adding --newline-is-cr or    PCRE, you must add --enable-utf8 to the "configure" command. Without it, the
171    --newline-is-nl to the "configure" command, respectively. Only do this if you    code for handling UTF-8 is not included in the library. Even when included,
172    really understand what you are doing. On traditional Unix-like systems, the    it still has to be enabled by an option at run time. When PCRE is compiled
173    newline character is NL.    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  . 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    storage for processing capturing parentheses if there are more than 10 of
208    them. You can increase this threshold by setting, for example,    them in a pattern. You can increase this threshold by setting, for example,
209    
210    --with-posix-malloc-threshold=20    --with-posix-malloc-threshold=20
211    
212    on the "configure" command.    on the "configure" command.
213    
214  . PCRE has a counter which can be set to limit the amount of resources it uses.  . 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    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,    million. You can change the default by setting, for example,
217    
218    --with-match-limit=500000    --with-match-limit=500000
219    
220    on the "configure" command. This is just the default; individual calls to    on the "configure" command. This is just the default; individual calls to
221    pcre_exec() can supply their own value. There is discussion on the pcreapi    pcre_exec() can supply their own value. There is more discussion on the
222    man page.    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  . 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    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    increase it even more by setting --with-link-size=4, but this is unlikely
237    ever to be necessary. If you build PCRE with an increased link size, test 2    ever to be necessary. Increasing the internal link size will reduce
238    (and 5 if you are using UTF-8) will fail. Part of the output of these tests    performance.
239    is a representation of the compiled pattern, and this changes with the link  
240    size.  . 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  . You can build PCRE so that its match() function does not call itself    obtained from the heap via the special functions pcre_stack_malloc() and
243    recursively. Instead, it uses blocks of data from the heap via special    pcre_stack_free() to save data that would otherwise be saved on the stack. To
244    functions pcre_stack_malloc() and pcre_stack_free() to save data that would    build PCRE like this, use
   otherwise be saved on the stack. To build PCRE like this, use  
245    
246    --disable-stack-for-recursion    --disable-stack-for-recursion
247    
248    on the "configure" command. PCRE runs more slowly in this mode, but it may be    on the "configure" command. PCRE runs more slowly in this mode, but it may be
249    necessary in environments with limited stack sizes.    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  The "configure" script builds five files:  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  . libtool is a script that builds shared and/or static libraries  If a C++ compiler is found, the following files are also built:
320  . Makefile is built by copying Makefile.in and making substitutions.  
321  . config.h is built by copying config.in and making substitutions.  . libpcrecpp.pc is data for the pkg-config command
322  . pcre-config is built by copying pcre-config.in and making substitutions.  . pcrecpparg.h is a header file for programs that call PCRE via the C++ wrapper
323  . RunTest is a script for running tests  . pcre_stringpiece.h is the header for the C++ "stringpiece" functions
324    
325  Once "configure" has run, you can run "make". It builds two libraries called  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  libpcre and libpcreposix, a test program called pcretest, and the pcregrep
331  command. You can use "make install" to copy these, the public header files  command. If a C++ compiler was found on your system, "make" also builds the C++
332  pcre.h and pcreposix.h, and the man pages to appropriate live directories on  wrapper library, which is called libpcrecpp, and some test programs called
333  your system, in the normal way.  pcrecpp_unittest, pcre_scanner_unittest, and pcre_stringpiece_unittest.
334    Building the C++ wrapper can be disabled by adding --disable-cpp to the
335  Running "make install" also installs the command pcre-config, which can be used  "configure" command.
336  to recall information about the PCRE configuration and installation. For  
337  example,  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    pcre-config --version
399    
400  prints the version number, and  prints the version number, and
401    
402   pcre-config --libs    pcre-config --libs
403    
404  outputs information about where the library is installed. This command can be  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  included in makefiles for programs that use PCRE, saving the programmer from
406  having to remember too many details.  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  Shared libraries on Unix-like systems
419  -------------------------------------  -------------------------------------
420    
421  The default distribution builds PCRE as two shared libraries and two static  The default distribution builds PCRE as shared libraries and static libraries,
422  libraries, as long as the operating system supports shared libraries. Shared  as long as the operating system supports shared libraries. Shared library
423  library support relies on the "libtool" script which is built as part of the  support relies on the "libtool" script which is built as part of the
424  "configure" process.  "configure" process.
425    
426  The libtool script is used to compile and link both shared and static  The libtool script is used to compile and link both shared and static
# Line 154  built. The programs pcretest and pcregre Line 429  built. The programs pcretest and pcregre
429  libraries (by means of wrapper scripts in the case of shared libraries). When  libraries (by means of wrapper scripts in the case of shared libraries). When
430  you use "make install" to install shared libraries, pcregrep and pcretest are  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  automatically re-built to use the newly installed shared libraries before being
432  installed themselves. However, the versions left in the source directory still  installed themselves. However, the versions left in the build directory still
433  use the uninstalled libraries.  use the uninstalled libraries.
434    
435  To build PCRE using static libraries only you must use --disable-shared when  To build PCRE using static libraries only you must use --disable-shared when
436  configuring it. For example  configuring it. For example:
437    
438  ./configure --prefix=/usr/gnu --disable-shared  ./configure --prefix=/usr/gnu --disable-shared
439    
# Line 166  Then run "make" in the usual way. Simila Line 441  Then run "make" in the usual way. Simila
441  build only shared libraries.  build only shared libraries.
442    
443    
444  Cross-compiling on a Unix-like system  Cross-compiling on Unix-like systems
445  -------------------------------------  ------------------------------------
446    
447  You can specify CC and CFLAGS in the normal way to the "configure" command, in  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, during the building  order to cross-compile PCRE for some other host. However, you should NOT
449  process, the dftables.c source file is compiled *and run* on the local host, in  specify --enable-rebuild-chartables, because if you do, the dftables.c source
450  order to generate the default character tables (the chartables.c file). It  file is compiled and run on the local host, in order to generate the inbuilt
451  therefore needs to be compiled with the local compiler, not the cross compiler.  character tables (the pcre_chartables.c file). This will probably not work,
452  You can do this by specifying CC_FOR_BUILD (and if necessary CFLAGS_FOR_BUILD)  because dftables.c needs to be compiled with the local compiler, not the cross
453  when calling the "configure" command. If they are not specified, they default  compiler.
454  to the values of CC and CFLAGS.  
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  Building on non-Unix systems  that assumes ASCII code. Cross-compiling with the default tables should not be
458  ----------------------------  a problem.
459    
460  For a non-Unix system, read the comments in the file NON-UNIX-USE, though if  If you need to modify the character tables when cross-compiling, you should
461  the system supports the use of "configure" and "make" you may be able to build  move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
462  PCRE in the same way as for Unix systems.  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  PCRE has been compiled on Windows systems and on Macintoshes, but I don't know  
465  the details because I don't use those systems. It should be straightforward to  
466  build PCRE on any system that has a Standard C compiler, because it uses only  Using HP's ANSI C++ compiler (aCC)
467  Standard C functions.  ----------------------------------
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 that is created by the  To test the basic PCRE library on a Unix system, run the RunTest script that is
508  configuring process. (This can also be run by "make runtest", "make check", or  created by the configuring process. There is also a script called RunGrepTest
509  "make test".) For other systems, see the instructions 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  The script runs the pcretest test program (which is documented in its own man  pcre_stringpiece_unittest are also built.
512  page) on each of the testinput files (in the testdata directory) in turn,  
513  and compares the output with the contents of the corresponding testoutput file.  Both the scripts and all the program tests are run if you obey "make check" or
514  A file called testtry is used to hold the output from pcretest. To run pcretest  "make test". For other systems, see the instructions in NON-UNIX-USE.
515  on just one of the test files, give its number as an argument to RunTest, for  
516  example:  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
519    files. A file called testtry is used to hold the main output from pcretest
520    (testsavedregex is also used as a working file). To run pcretest on just one of
521    the test files, give its number as an argument to RunTest, for example:
522    
523    RunTest 2    RunTest 2
524    
525  The first file can also be fed directly into the perltest script to check that  The first test file can also be fed directly into the perltest.pl script to
526  Perl gives the same results. The only difference you should see is in the first  check that Perl gives the same results. The only difference you should see is
527  few lines, where the Perl version is given instead of the PCRE version.  in the first few lines, where the Perl version is given instead of the PCRE
528    version.
529    
530  The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),  The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),
531  pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error  pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
532  detection, and run-time flags that are specific to PCRE, as well as the POSIX  detection, and run-time flags that are specific to PCRE, as well as the POSIX
533  wrapper API. It also uses the debugging flag to check some of the internals of  wrapper API. It also uses the debugging flags to check some of the internals of
534  pcre_compile().  pcre_compile().
535    
536  If you build PCRE with a locale setting that is not the standard C locale, the  If you build PCRE with a locale setting that is not the standard C locale, the
# Line 241  is output to say why. If running this te Line 556  is output to say why. If running this te
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    [If you are trying to run this test on Windows, you may be able to get it to
560    work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
561    RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
562    Windows versions of test 2. More info on using RunTest.bat is included in the
563    document entitled NON-UNIX-USE.]
564    
565  The fourth test checks the UTF-8 support. It is not run automatically unless  The fourth test checks the UTF-8 support. It is not run automatically unless
566  PCRE is built with UTF-8 support. To do this you must set --enable-utf8 when  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 script,  running "configure". This file can be also fed directly to the perltest script,
568  provided you are running Perl 5.8 or higher. (For Perl 5.6, a small patch,  provided you are running Perl 5.8 or higher. (For Perl 5.6, a small patch,
569  commented in the script, can be be used.)  commented in the script, can be be used.)
570    
571  The fifth and final file tests error handling with UTF-8 encoding, and internal  The fifth test checks error handling with UTF-8 encoding, and internal UTF-8
572  UTF-8 features of PCRE that are not relevant to Perl.  features of PCRE that are not relevant to Perl.
573    
574    The sixth test checks the support for Unicode character properties. It it not
575    run automatically unless PCRE is built with Unicode property support. To to
576    this you must set --enable-unicode-properties 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    
584  Character tables  Character tables
585  ----------------  ----------------
586    
587  PCRE uses four tables for manipulating and identifying characters. The final  For speed, PCRE uses four tables for manipulating and identifying characters
588  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
589  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
590  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
591  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
592  the binary is used.  passed as NULL, a set of default tables that is built into the binary is used.
593    
594  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
595  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
596  (compiled from dftables.c), which uses the ANSI C character handling functions  tables for ASCII coding. However, if --enable-rebuild-chartables is specified
597  such as isalnum(), isalpha(), isupper(), islower(), etc. to build the table  for ./configure, a different version of pcre_chartables.c is built by the
598  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
599  control the contents of these default tables. You can change the default tables  handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
600  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
601  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
602  re-generated.  the default tables by editing pcre_chartables.c and then re-building PCRE. If
603    you do this, you should take care to ensure that the file does not get
604    automatically re-generated. The best way to do this is to move
605    pcre_chartables.c.dist out of the way and replace it with your customized
606    tables.
607    
608    When the dftables program is run as a result of --enable-rebuild-chartables,
609    it uses the default C locale that is set on your system. It does not pay
610    attention to the LC_xxx environment variables. In other words, it uses the
611    system's default locale rather than whatever the compiling user happens to have
612    set. If you really do want to build a source set of character tables in a
613    locale that is specified by the LC_xxx variables, you can run the dftables
614    program by hand with the -L option. For example:
615    
616      ./dftables -L pcre_chartables.c.special
617    
618  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,
619  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
620  digits, "word" characters, and white space, respectively. These are used when  digits, "word" characters, and white space, respectively. These are used when
621  building 32-byte bit maps that represent character classes.  building 32-byte bit maps that represent character classes for code points less
622    than 256.
623    
624  The final 256-byte table has bits indicating various character types, as  The final 256-byte table has bits indicating various character types, as
625  follows:  follows:
# Line 290  You should not alter the set of characte Line 635  You should not alter the set of characte
635  will cause PCRE to malfunction.  will cause PCRE to malfunction.
636    
637    
638  Manifest  File manifest
639  --------  -------------
640    
641  The distribution should contain the following files:  The distribution should contain the following files:
642    
643  (A) The actual source files of the PCRE library functions and their  (A) Source files of the PCRE library functions and their headers:
     headers:  
644    
645    dftables.c            auxiliary program for building chartables.c    dftables.c              auxiliary program for building pcre_chartables.c
646    get.c                 )                              when --enable-rebuild-chartables is specified
   maketables.c          )  
   study.c               ) source of  
   pcre.c                )   the functions  
   pcreposix.c           )  
   printint.c            )  
   pcre.in               "source" for the header for the external API; pcre.h  
                           is built from this by "configure"  
   pcreposix.h           header for the external POSIX wrapper API  
   internal.h            header for internal use  
   config.in             template for config.h, which is built by configure  
   
 (B) Auxiliary files:  
   
   AUTHORS               information about the author of PCRE  
   ChangeLog             log of changes to the code  
   INSTALL               generic installation instructions  
   LICENCE               conditions for the use of PCRE  
   COPYING               the same, using GNU's standard name  
   Makefile.in           template for Unix Makefile, which is built by configure  
   NEWS                  important changes in this release  
   NON-UNIX-USE          notes on building PCRE on non-Unix systems  
   README                this file  
   RunTest.in            template for a Unix shell script for running tests  
   config.guess          ) files used by libtool,  
   config.sub            )   used only when building a shared library  
   configure             a configuring shell script (built by autoconf)  
   configure.in          the autoconf input used to build configure  
   doc/Tech.Notes        notes on the encoding  
   doc/*.3               man page sources for the PCRE functions  
   doc/*.1               man page sources for pcregrep and pcretest  
   doc/html/*            HTML documentation  
   doc/pcre.txt          plain text version of the man pages  
   doc/pcretest.txt      plain text documentation of test program  
   doc/perltest.txt      plain text documentation of Perl test program  
   install-sh            a shell script for installing files  
   ltmain.sh             file used to build a libtool script  
   pcretest.c            comprehensive test program  
   pcredemo.c            simple demonstration of coding calls to PCRE  
   perltest              Perl test program  
   pcregrep.c            source of a grep utility that uses PCRE  
   pcre-config.in        source of script which retains PCRE information  
   testdata/testinput1   test data, compatible with Perl  
   testdata/testinput2   test data for error messages and non-Perl things  
   testdata/testinput3   test data for locale-specific tests  
   testdata/testinput4   test data for UTF-8 tests compatible with Perl  
   testdata/testinput5   test data for other UTF-8 tests  
   testdata/testoutput1  test results corresponding to testinput1  
   testdata/testoutput2  test results corresponding to testinput2  
   testdata/testoutput3  test results corresponding to testinput3  
   testdata/testoutput4  test results corresponding to testinput4  
   testdata/testoutput5  test results corresponding to testinput5  
647    
648  (C) Auxiliary files for Win32 DLL    pcre_chartables.c.dist  a default set of character tables that assume ASCII
649                                coding; used, unless --enable-rebuild-chartables is
650                                specified, by copying to pcre_chartables.c
651    
652      pcreposix.c             )
653      pcre_compile.c          )
654      pcre_config.c           )
655      pcre_dfa_exec.c         )
656      pcre_exec.c             )
657      pcre_fullinfo.c         )
658      pcre_get.c              ) sources for the functions in the library,
659      pcre_globals.c          )   and some internal functions that they use
660      pcre_info.c             )
661      pcre_maketables.c       )
662      pcre_newline.c          )
663      pcre_ord2utf8.c         )
664      pcre_refcount.c         )
665      pcre_study.c            )
666      pcre_tables.c           )
667      pcre_try_flipped.c      )
668      pcre_ucd.c              )
669      pcre_valid_utf8.c       )
670      pcre_version.c          )
671      pcre_xclass.c           )
672      pcre_printint.src       ) debugging function that is #included in pcretest,
673                              )   and can also be #included in pcre_compile()
674      pcre.h.in               template for pcre.h when built by "configure"
675      pcreposix.h             header for the external POSIX wrapper API
676      pcre_internal.h         header for internal use
677      ucp.h                   header for Unicode property handling
678    
679      config.h.in             template for config.h, which is built by "configure"
680    
681      pcrecpp.h               public header file for the C++ wrapper
682      pcrecpparg.h.in         template for another C++ header file
683      pcre_scanner.h          public header file for C++ scanner functions
684      pcrecpp.cc              )
685      pcre_scanner.cc         ) source for the C++ wrapper library
686    
687      pcre_stringpiece.h.in   template for pcre_stringpiece.h, the header for the
688                                C++ stringpiece functions
689      pcre_stringpiece.cc     source for the C++ stringpiece functions
690    
691    (B) Source files for programs that use PCRE:
692    
693      pcredemo.c              simple demonstration of coding calls to PCRE
694      pcregrep.c              source of a grep utility that uses PCRE
695      pcretest.c              comprehensive test program
696    
697    (C) Auxiliary files:
698    
699      132html                 script to turn "man" pages into HTML
700      AUTHORS                 information about the author of PCRE
701      ChangeLog               log of changes to the code
702      CleanTxt                script to clean nroff output for txt man pages
703      Detrail                 script to remove trailing spaces
704      HACKING                 some notes about the internals of PCRE
705      INSTALL                 generic installation instructions
706      LICENCE                 conditions for the use of PCRE
707      COPYING                 the same, using GNU's standard name
708      Makefile.in             ) template for Unix Makefile, which is built by
709                              )   "configure"
710      Makefile.am             ) the automake input that was used to create
711                              )   Makefile.in
712      NEWS                    important changes in this release
713      NON-UNIX-USE            notes on building PCRE on non-Unix systems
714      PrepareRelease          script to make preparations for "make dist"
715      README                  this file
716      RunTest                 a Unix shell script for running tests
717      RunGrepTest             a Unix shell script for pcregrep tests
718      aclocal.m4              m4 macros (generated by "aclocal")
719      config.guess            ) files used by libtool,
720      config.sub              )   used only when building a shared library
721      configure               a configuring shell script (built by autoconf)
722      configure.ac            ) the autoconf input that was used to build
723                              )   "configure" and config.h
724      depcomp                 ) script to find program dependencies, generated by
725                              )   automake
726      doc/*.3                 man page sources for PCRE
727      doc/*.1                 man page sources for pcregrep and pcretest
728      doc/index.html.src      the base HTML page
729      doc/html/*              HTML documentation
730      doc/pcre.txt            plain text version of the man pages
731      doc/pcretest.txt        plain text documentation of test program
732      doc/perltest.txt        plain text documentation of Perl test program
733      install-sh              a shell script for installing files
734      libpcre.pc.in           template for libpcre.pc for pkg-config
735      libpcreposix.pc.in      template for libpcreposix.pc for pkg-config
736      libpcrecpp.pc.in        template for libpcrecpp.pc for pkg-config
737      ltmain.sh               file used to build a libtool script
738      missing                 ) common stub for a few missing GNU programs while
739                              )   installing, generated by automake
740      mkinstalldirs           script for making install directories
741      perltest.pl             Perl test program
742      pcre-config.in          source of script which retains PCRE information
743      pcrecpp_unittest.cc          )
744      pcre_scanner_unittest.cc     ) test programs for the C++ wrapper
745      pcre_stringpiece_unittest.cc )
746      testdata/testinput*     test data for main library tests
747      testdata/testoutput*    expected test results
748      testdata/grep*          input and output for pcregrep tests
749    
750    (D) Auxiliary files for cmake support
751    
752      cmake/COPYING-CMAKE-SCRIPTS
753      cmake/FindPackageHandleStandardArgs.cmake
754      cmake/FindReadline.cmake
755      CMakeLists.txt
756      config-cmake.h.in
757    
758    dll.mk  (E) Auxiliary files for VPASCAL
   pcre.def  
   
 (D) Auxiliary file for VPASCAL  
759    
760    makevp.bat    makevp.bat
761      makevp_c.txt
762      makevp_l.txt
763      pcregexp.pas
764    
765    (F) Auxiliary files for building PCRE "by hand"
766    
767      pcre.h.generic          ) a version of the public PCRE header file
768                              )   for use in non-"configure" environments
769      config.h.generic        ) a version of config.h for use in non-"configure"
770                              )   environments
771    
772    (F) Miscellaneous
773    
774      RunTest.bat            a script for running tests under Windows
775    
776  Philip Hazel <ph10@cam.ac.uk>  Philip Hazel
777  December 2003  Email local part: ph10
778    Email domain: cam.ac.uk
779    Last updated: 16 September 2009

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