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1 nigel 41 README file for PCRE (Perl-compatible regular expression library)
2     -----------------------------------------------------------------
3 nigel 3
4 ph10 374 The latest release of PCRE is always available in three alternative formats
5     from:
6 nigel 43
7     ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.gz
8 ph10 374 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 ph10 123
11 ph10 111 There is a mailing list for discussion about the development of PCRE at
12 nigel 43
13 ph10 123 pcre-dev@exim.org
14    
15 nigel 41 Please read the NEWS file if you are upgrading from a previous release.
16 ph10 109 The contents of this README file are:
17 nigel 23
18 ph10 109 The PCRE APIs
19     Documentation for PCRE
20     Contributions by users of PCRE
21     Building PCRE on non-Unix systems
22 ph10 122 Building PCRE on Unix-like systems
23     Retrieving configuration information on Unix-like systems
24 ph10 109 Shared libraries on Unix-like systems
25 ph10 122 Cross-compiling on Unix-like systems
26 ph10 109 Using HP's ANSI C++ compiler (aCC)
27 ph10 461 Using PCRE from MySQL
28 ph10 111 Making new tarballs
29 ph10 109 Testing PCRE
30     Character tables
31     File manifest
32 nigel 35
33 ph10 109
34 nigel 77 The PCRE APIs
35     -------------
36    
37 ph10 128 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 nigel 77
41 ph10 128 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 nigel 77
48 ph10 109 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 nigel 73 If you are using the POSIX interface to PCRE and there is already a POSIX regex
55 ph10 109 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 nigel 73 ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
58 ph10 109 up the POSIX functions of the same name from the other library.
59 nigel 49
60 ph10 109 One way of avoiding this confusion is to compile PCRE with the addition of
61 ph10 122 -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 nigel 73
67 ph10 109
68 nigel 75 Documentation for PCRE
69     ----------------------
70    
71 ph10 122 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 nigel 75
76 ph10 109 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 ph10 123 similar tools. They are installed in <prefix>/share/doc/pcre, where
83 ph10 111 <prefix> is the installation prefix (defaulting to /usr/local).
84 nigel 75
85 ph10 109 2. A set of files containing all the documentation in HTML form, hyperlinked
86 ph10 123 in various ways, and rooted in a file called index.html, is distributed in
87 ph10 122 doc/html and installed in <prefix>/share/doc/pcre/html.
88 ph10 406
89 ph10 401 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 nigel 75
93    
94 nigel 53 Contributions by users of PCRE
95     ------------------------------
96    
97     You can find contributions from PCRE users in the directory
98    
99     ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
100    
101 ph10 122 There is a README file giving brief descriptions of what they are. Some are
102     complete in themselves; others are pointers to URLs containing relevant files.
103 ph10 128 Some of this material is likely to be well out-of-date. Several of the earlier
104     contributions provided support for compiling PCRE on various flavours of
105     Windows (I myself do not use Windows). Nowadays there is more Windows support
106     in the standard distribution, so these contibutions have been archived.
107 nigel 53
108    
109 ph10 109 Building PCRE on non-Unix systems
110     ---------------------------------
111 ph10 101
112 ph10 122 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 ph10 260 able to build PCRE in the same way as for Unix-like systems. PCRE can also be
115 ph10 436 configured in many platform environments using the GUI facility provided by
116     CMake's cmake-gui command. This creates Makefiles, solution files, etc.
117 ph10 101
118 ph10 109 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 ph10 101
122    
123 ph10 122 Building PCRE on Unix-like systems
124     ----------------------------------
125 nigel 3
126 nigel 87 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 ph10 145 The following instructions assume the use of the widely used "configure, make,
130 ph10 317 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 ph10 144
134 nigel 63 To build PCRE on a Unix-like system, first run the "configure" command from the
135     PCRE distribution directory, with your current directory set to the directory
136     where you want the files to be created. This command is a standard GNU
137     "autoconf" configuration script, for which generic instructions are supplied in
138 ph10 122 the file INSTALL.
139 nigel 3
140 nigel 53 Most commonly, people build PCRE within its own distribution directory, and in
141 ph10 109 this case, on many systems, just running "./configure" is sufficient. However,
142     the usual methods of changing standard defaults are available. For example:
143 nigel 53
144 nigel 41 CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
145    
146     specifies that the C compiler should be run with the flags '-O2 -Wall' instead
147     of the default, and that "make install" should install PCRE under /opt/local
148 nigel 49 instead of the default /usr/local.
149 nigel 41
150 nigel 53 If you want to build in a different directory, just run "configure" with that
151     directory as current. For example, suppose you have unpacked the PCRE source
152     into /source/pcre/pcre-xxx, but you want to build it in /build/pcre/pcre-xxx:
153    
154     cd /build/pcre/pcre-xxx
155     /source/pcre/pcre-xxx/configure
156    
157 nigel 87 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 nigel 63 There are some optional features that can be included or omitted from the PCRE
162 ph10 654 library. They are also documented in the pcrebuild man page.
163 nigel 49
164 ph10 654 . By default, both shared and static libraries are built. You can change this
165     by adding one of these options to the "configure" command:
166    
167     --disable-shared
168     --disable-static
169    
170     (See also "Shared libraries on Unix-like systems" below.)
171    
172 nigel 83 . If you want to suppress the building of the C++ wrapper library, you can add
173     --disable-cpp to the "configure" command. Otherwise, when "configure" is run,
174 ph10 128 it will try to find a C++ compiler and C++ header files, and if it succeeds,
175     it will try to build the C++ wrapper.
176 ph10 691
177     . If you want to include support for just-in-time compiling, which can give
178     large performance improvements on certain platforms, add --enable-jit to the
179     "configure" command. This support is available only for certain hardware
180     architectures. If you try to enable it on an unsupported architecture, there
181 ph10 678 will be a compile time error.
182 ph10 691
183 ph10 685 . When JIT support is enabled, pcregrep automatically makes use of it, unless
184 ph10 691 you add --disable-pcregrep-jit to the "configure" command.
185 nigel 83
186 ph10 391 . If you want to make use of the support for UTF-8 Unicode character strings in
187     PCRE, you must add --enable-utf8 to the "configure" command. Without it, the
188     code for handling UTF-8 is not included in the library. Even when included,
189     it still has to be enabled by an option at run time. When PCRE is compiled
190     with this option, its input can only either be ASCII or UTF-8, even when
191     running on EBCDIC platforms. It is not possible to use both --enable-utf8 and
192     --enable-ebcdic at the same time.
193 nigel 63
194 nigel 75 . If, in addition to support for UTF-8 character strings, you want to include
195     support for the \P, \p, and \X sequences that recognize Unicode character
196     properties, you must add --enable-unicode-properties to the "configure"
197 nigel 91 command. This adds about 30K to the size of the library (in the form of a
198 nigel 75 property table); only the basic two-letter properties such as Lu are
199     supported.
200    
201 nigel 93 . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
202 ph10 149 of the preceding, or any of the Unicode newline sequences as indicating the
203     end of a line. Whatever you specify at build time is the default; the caller
204     of PCRE can change the selection at run time. The default newline indicator
205     is a single LF character (the Unix standard). You can specify the default
206     newline indicator by adding --enable-newline-is-cr or --enable-newline-is-lf
207     or --enable-newline-is-crlf or --enable-newline-is-anycrlf or
208     --enable-newline-is-any to the "configure" command, respectively.
209 ph10 109
210 ph10 149 If you specify --enable-newline-is-cr or --enable-newline-is-crlf, some of
211     the standard tests will fail, because the lines in the test files end with
212     LF. Even if the files are edited to change the line endings, there are likely
213     to be some failures. With --enable-newline-is-anycrlf or
214     --enable-newline-is-any, many tests should succeed, but there may be some
215     failures.
216 ph10 254
217     . By default, the sequence \R in a pattern matches any Unicode line ending
218     sequence. This is independent of the option specifying what PCRE considers to
219 ph10 251 be the end of a line (see above). However, the caller of PCRE can restrict \R
220     to match only CR, LF, or CRLF. You can make this the default by adding
221     --enable-bsr-anycrlf to the "configure" command (bsr = "backslash R").
222 nigel 63
223     . When called via the POSIX interface, PCRE uses malloc() to get additional
224     storage for processing capturing parentheses if there are more than 10 of
225 ph10 128 them in a pattern. You can increase this threshold by setting, for example,
226 nigel 63
227     --with-posix-malloc-threshold=20
228    
229     on the "configure" command.
230    
231 nigel 77 . PCRE has a counter that can be set to limit the amount of resources it uses.
232 nigel 63 If the limit is exceeded during a match, the match fails. The default is ten
233     million. You can change the default by setting, for example,
234    
235     --with-match-limit=500000
236    
237     on the "configure" command. This is just the default; individual calls to
238 ph10 122 pcre_exec() can supply their own value. There is more discussion on the
239     pcreapi man page.
240 nigel 63
241 nigel 91 . There is a separate counter that limits the depth of recursive function calls
242     during a matching process. This also has a default of ten million, which is
243     essentially "unlimited". You can change the default by setting, for example,
244    
245     --with-match-limit-recursion=500000
246    
247     Recursive function calls use up the runtime stack; running out of stack can
248     cause programs to crash in strange ways. There is a discussion about stack
249     sizes in the pcrestack man page.
250    
251 nigel 63 . The default maximum compiled pattern size is around 64K. You can increase
252     this by adding --with-link-size=3 to the "configure" command. You can
253     increase it even more by setting --with-link-size=4, but this is unlikely
254 ph10 128 ever to be necessary. Increasing the internal link size will reduce
255     performance.
256 nigel 63
257 nigel 77 . You can build PCRE so that its internal match() function that is called from
258 ph10 122 pcre_exec() does not call itself recursively. Instead, it uses memory blocks
259     obtained from the heap via the special functions pcre_stack_malloc() and
260     pcre_stack_free() to save data that would otherwise be saved on the stack. To
261     build PCRE like this, use
262 nigel 73
263     --disable-stack-for-recursion
264    
265     on the "configure" command. PCRE runs more slowly in this mode, but it may be
266 nigel 77 necessary in environments with limited stack sizes. This applies only to the
267 ph10 672 normal execution of the pcre_exec() function; if JIT support is being
268     successfully used, it is not relevant. Equally, it does not apply to
269     pcre_dfa_exec(), which does not use deeply nested recursion. There is a
270     discussion about stack sizes in the pcrestack man page.
271 nigel 73
272 ph10 128 . For speed, PCRE uses four tables for manipulating and identifying characters
273     whose code point values are less than 256. By default, it uses a set of
274     tables for ASCII encoding that is part of the distribution. If you specify
275    
276     --enable-rebuild-chartables
277    
278     a program called dftables is compiled and run in the default C locale when
279     you obey "make". It builds a source file called pcre_chartables.c. If you do
280     not specify this option, pcre_chartables.c is created as a copy of
281     pcre_chartables.c.dist. See "Character tables" below for further information.
282    
283     . It is possible to compile PCRE for use on systems that use EBCDIC as their
284 ph10 391 character code (as opposed to ASCII) by specifying
285 ph10 128
286     --enable-ebcdic
287    
288 ph10 392 This automatically implies --enable-rebuild-chartables (see above). However,
289     when PCRE is built this way, it always operates in EBCDIC. It cannot support
290 ph10 391 both EBCDIC and UTF-8.
291 ph10 128
292 ph10 289 . It is possible to compile pcregrep to use libz and/or libbz2, in order to
293 ph10 287 read .gz and .bz2 files (respectively), by specifying one or both of
294 ph10 286
295     --enable-pcregrep-libz
296     --enable-pcregrep-libbz2
297 ph10 289
298 ph10 287 Of course, the relevant libraries must be installed on your system.
299 ph10 289
300 ph10 654 . The default size of internal buffer used by pcregrep can be set by, for
301     example:
302    
303     --with-pcregrep-bufsize=50K
304    
305     The default value is 20K.
306    
307 ph10 289 . It is possible to compile pcretest so that it links with the libreadline
308 ph10 287 library, by specifying
309 ph10 289
310     --enable-pcretest-libreadline
311    
312 ph10 287 If this is done, when pcretest's input is from a terminal, it reads it using
313     the readline() function. This provides line-editing and history facilities.
314     Note that libreadline is GPL-licenced, so if you distribute a binary of
315     pcretest linked in this way, there may be licensing issues.
316 ph10 345
317     Setting this option causes the -lreadline option to be added to the pcretest
318 ph10 338 build. In many operating environments with a sytem-installed readline
319     library this is sufficient. However, in some environments (e.g. if an
320     unmodified distribution version of readline is in use), it may be necessary
321     to specify something like LIBS="-lncurses" as well. This is because, to quote
322     the readline INSTALL, "Readline uses the termcap functions, but does not link
323     with the termcap or curses library itself, allowing applications which link
324 ph10 392 with readline the to choose an appropriate library." If you get error
325     messages about missing functions tgetstr, tgetent, tputs, tgetflag, or tgoto,
326     this is the problem, and linking with the ncurses library should fix it.
327 ph10 286
328 ph10 109 The "configure" script builds the following files for the basic C library:
329 nigel 49
330 ph10 672 . Makefile the makefile that builds the library
331     . config.h build-time configuration options for the library
332     . pcre.h the public PCRE header file
333     . pcre-config script that shows the building settings such as CFLAGS
334     that were set for "configure"
335     . libpcre.pc ) data for the pkg-config command
336     . libpcreposix.pc )
337     . libtool script that builds shared and/or static libraries
338     . RunTest script for running tests on the basic C library
339     . RunGrepTest script for running tests on the pcregrep command
340 nigel 41
341 ph10 489 Versions of config.h and pcre.h are distributed in the PCRE tarballs under the
342     names config.h.generic and pcre.h.generic. These are provided for those who
343     have to built PCRE without using "configure" or CMake. If you use "configure"
344     or CMake, the .generic versions are not used.
345 nigel 77
346 ph10 109 If a C++ compiler is found, the following files are also built:
347    
348 ph10 672 . libpcrecpp.pc data for the pkg-config command
349     . pcrecpparg.h header file for calling PCRE via the C++ wrapper
350     . pcre_stringpiece.h header for the C++ "stringpiece" functions
351 nigel 77
352     The "configure" script also creates config.status, which is an executable
353     script that can be run to recreate the configuration, and config.log, which
354     contains compiler output from tests that "configure" runs.
355    
356     Once "configure" has run, you can run "make". It builds two libraries, called
357 ph10 312 libpcre and libpcreposix, a test program called pcretest, and the pcregrep
358 ph10 691 command. If a C++ compiler was found on your system, and you did not disable it
359 ph10 672 with --disable-cpp, "make" also builds the C++ wrapper library, which is called
360     libpcrecpp, and some test programs called pcrecpp_unittest,
361 ph10 691 pcre_scanner_unittest, and pcre_stringpiece_unittest. If you enabled JIT
362 ph10 672 support with --enable-jit, a test program called pcre_jit_test is also built.
363 nigel 3
364 ph10 109 The command "make check" runs all the appropriate tests. Details of the PCRE
365     tests are given below in a separate section of this document.
366 nigel 75
367 ph10 109 You can use "make install" to install PCRE into live directories on your
368     system. The following are installed (file names are all relative to the
369     <prefix> that is set when "configure" is run):
370 nigel 77
371 ph10 109 Commands (bin):
372     pcretest
373     pcregrep
374 ph10 111 pcre-config
375 ph10 109
376     Libraries (lib):
377     libpcre
378     libpcreposix
379     libpcrecpp (if C++ support is enabled)
380    
381     Configuration information (lib/pkgconfig):
382     libpcre.pc
383 ph10 672 libpcreposix.pc
384 ph10 122 libpcrecpp.pc (if C++ support is enabled)
385 ph10 109
386     Header files (include):
387     pcre.h
388     pcreposix.h
389     pcre_scanner.h )
390     pcre_stringpiece.h ) if C++ support is enabled
391     pcrecpp.h )
392     pcrecpparg.h )
393    
394     Man pages (share/man/man{1,3}):
395     pcregrep.1
396     pcretest.1
397 ph10 691 pcre-config.1
398 ph10 109 pcre.3
399     pcre*.3 (lots more pages, all starting "pcre")
400    
401     HTML documentation (share/doc/pcre/html):
402     index.html
403     *.html (lots more pages, hyperlinked from index.html)
404    
405     Text file documentation (share/doc/pcre):
406     AUTHORS
407     COPYING
408     ChangeLog
409     LICENCE
410     NEWS
411     README
412 ph10 672 pcre.txt (a concatenation of the man(3) pages)
413     pcretest.txt the pcretest man page
414     pcregrep.txt the pcregrep man page
415 ph10 691 pcre-config.txt the pcre-config man page
416 ph10 109
417 nigel 77 If you want to remove PCRE from your system, you can run "make uninstall".
418     This removes all the files that "make install" installed. However, it does not
419     remove any directories, because these are often shared with other programs.
420    
421    
422 ph10 122 Retrieving configuration information on Unix-like systems
423     ---------------------------------------------------------
424 nigel 75
425 ph10 109 Running "make install" installs the command pcre-config, which can be used to
426     recall information about the PCRE configuration and installation. For example:
427 nigel 37
428 nigel 43 pcre-config --version
429    
430     prints the version number, and
431    
432 nigel 75 pcre-config --libs
433 nigel 43
434     outputs information about where the library is installed. This command can be
435     included in makefiles for programs that use PCRE, saving the programmer from
436     having to remember too many details.
437    
438 nigel 75 The pkg-config command is another system for saving and retrieving information
439     about installed libraries. Instead of separate commands for each library, a
440     single command is used. For example:
441 nigel 43
442 nigel 75 pkg-config --cflags pcre
443    
444     The data is held in *.pc files that are installed in a directory called
445 ph10 109 <prefix>/lib/pkgconfig.
446 nigel 75
447    
448 nigel 63 Shared libraries on Unix-like systems
449     -------------------------------------
450 nigel 53
451 nigel 77 The default distribution builds PCRE as shared libraries and static libraries,
452     as long as the operating system supports shared libraries. Shared library
453     support relies on the "libtool" script which is built as part of the
454 nigel 53 "configure" process.
455 nigel 39
456 nigel 53 The libtool script is used to compile and link both shared and static
457     libraries. They are placed in a subdirectory called .libs when they are newly
458     built. The programs pcretest and pcregrep are built to use these uninstalled
459     libraries (by means of wrapper scripts in the case of shared libraries). When
460     you use "make install" to install shared libraries, pcregrep and pcretest are
461     automatically re-built to use the newly installed shared libraries before being
462 ph10 122 installed themselves. However, the versions left in the build directory still
463 nigel 53 use the uninstalled libraries.
464    
465     To build PCRE using static libraries only you must use --disable-shared when
466 nigel 75 configuring it. For example:
467 nigel 3
468 nigel 43 ./configure --prefix=/usr/gnu --disable-shared
469 nigel 41
470 nigel 53 Then run "make" in the usual way. Similarly, you can use --disable-static to
471     build only shared libraries.
472 nigel 41
473 nigel 43
474 ph10 122 Cross-compiling on Unix-like systems
475     ------------------------------------
476 nigel 63
477     You can specify CC and CFLAGS in the normal way to the "configure" command, in
478 ph10 128 order to cross-compile PCRE for some other host. However, you should NOT
479     specify --enable-rebuild-chartables, because if you do, the dftables.c source
480     file is compiled and run on the local host, in order to generate the inbuilt
481     character tables (the pcre_chartables.c file). This will probably not work,
482     because dftables.c needs to be compiled with the local compiler, not the cross
483     compiler.
484 nigel 63
485 ph10 128 When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
486     by making a copy of pcre_chartables.c.dist, which is a default set of tables
487     that assumes ASCII code. Cross-compiling with the default tables should not be
488     a problem.
489 nigel 63
490 ph10 128 If you need to modify the character tables when cross-compiling, you should
491     move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
492     run it on the local host to make a new version of pcre_chartables.c.dist.
493     Then when you cross-compile PCRE this new version of the tables will be used.
494    
495    
496 nigel 87 Using HP's ANSI C++ compiler (aCC)
497     ----------------------------------
498    
499 nigel 93 Unless C++ support is disabled by specifying the "--disable-cpp" option of the
500 ph10 122 "configure" script, you must include the "-AA" option in the CXXFLAGS
501 nigel 87 environment variable in order for the C++ components to compile correctly.
502    
503     Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
504     needed libraries fail to get included when specifying the "-AA" compiler
505     option. If you experience unresolved symbols when linking the C++ programs,
506     use the workaround of specifying the following environment variable prior to
507     running the "configure" script:
508    
509     CXXLDFLAGS="-lstd_v2 -lCsup_v2"
510    
511 ph10 461
512 ph10 469 Using Sun's compilers for Solaris
513     ---------------------------------
514    
515     A user reports that the following configurations work on Solaris 9 sparcv9 and
516     Solaris 9 x86 (32-bit):
517    
518     Solaris 9 sparcv9: ./configure --disable-cpp CC=/bin/cc CFLAGS="-m64 -g"
519     Solaris 9 x86: ./configure --disable-cpp CC=/bin/cc CFLAGS="-g"
520    
521    
522 ph10 452 Using PCRE from MySQL
523     ---------------------
524 ph10 123
525 ph10 461 On systems where both PCRE and MySQL are installed, it is possible to make use
526     of PCRE from within MySQL, as an alternative to the built-in pattern matching.
527 ph10 452 There is a web page that tells you how to do this:
528    
529 ph10 461 http://www.mysqludf.org/lib_mysqludf_preg/index.php
530 ph10 452
531    
532 ph10 111 Making new tarballs
533     -------------------
534 nigel 87
535 ph10 123 The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
536 ph10 155 zip formats. The command "make distcheck" does the same, but then does a trial
537     build of the new distribution to ensure that it works.
538 ph10 111
539 ph10 155 If you have modified any of the man page sources in the doc directory, you
540     should first run the PrepareRelease script before making a distribution. This
541     script creates the .txt and HTML forms of the documentation from the man pages.
542 ph10 111
543 ph10 155
544 nigel 41 Testing PCRE
545     ------------
546    
547 ph10 122 To test the basic PCRE library on a Unix system, run the RunTest script that is
548     created by the configuring process. There is also a script called RunGrepTest
549     that tests the options of the pcregrep command. If the C++ wrapper library is
550     built, three test programs called pcrecpp_unittest, pcre_scanner_unittest, and
551 ph10 691 pcre_stringpiece_unittest are also built. When JIT support is enabled, another
552 ph10 672 test program called pcre_jit_test is built.
553 nigel 41
554 ph10 109 Both the scripts and all the program tests are run if you obey "make check" or
555     "make test". For other systems, see the instructions in NON-UNIX-USE.
556 nigel 77
557     The RunTest script runs the pcretest test program (which is documented in its
558 ph10 672 own man page) on each of the relevant testinput files in the testdata
559     directory, and compares the output with the contents of the corresponding
560     testoutput files. Some tests are relevant only when certain build-time options
561     were selected. For example, the tests for UTF-8 support are run only if
562     --enable-utf8 was used. RunTest outputs a comment when it skips a test.
563    
564 ph10 691 Many of the tests that are not skipped are run up to three times. The second
565     run forces pcre_study() to be called for all patterns except for a few in some
566     tests that are marked "never study" (see the pcretest program for how this is
567     done). If JIT support is available, the non-DFA tests are run a third time,
568 ph10 672 this time with a forced pcre_study() with the PCRE_STUDY_JIT_COMPILE option.
569    
570     RunTest uses a file called testtry to hold the main output from pcretest
571 nigel 75 (testsavedregex is also used as a working file). To run pcretest on just one of
572     the test files, give its number as an argument to RunTest, for example:
573 nigel 41
574 nigel 63 RunTest 2
575 nigel 3
576 ph10 672 The first test file can be fed directly into the perltest.pl script to check
577     that Perl gives the same results. The only difference you should see is in the
578     first few lines, where the Perl version is given instead of the PCRE version.
579 nigel 3
580 nigel 49 The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),
581     pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
582     detection, and run-time flags that are specific to PCRE, as well as the POSIX
583 ph10 122 wrapper API. It also uses the debugging flags to check some of the internals of
584 nigel 49 pcre_compile().
585 nigel 7
586 nigel 49 If you build PCRE with a locale setting that is not the standard C locale, the
587     character tables may be different (see next paragraph). In some cases, this may
588     cause failures in the second set of tests. For example, in a locale where the
589     isprint() function yields TRUE for characters in the range 128-255, the use of
590     [:isascii:] inside a character class defines a different set of characters, and
591     this shows up in this test as a difference in the compiled code, which is being
592     listed for checking. Where the comparison test output contains [\x00-\x7f] the
593     test will contain [\x00-\xff], and similarly in some other cases. This is not a
594     bug in PCRE.
595    
596 nigel 63 The third set of tests checks pcre_maketables(), the facility for building a
597 nigel 25 set of character tables for a specific locale and using them instead of the
598 nigel 73 default tables. The tests make use of the "fr_FR" (French) locale. Before
599     running the test, the script checks for the presence of this locale by running
600     the "locale" command. If that command fails, or if it doesn't include "fr_FR"
601     in the list of available locales, the third test cannot be run, and a comment
602     is output to say why. If running this test produces instances of the error
603 nigel 25
604 nigel 73 ** Failed to set locale "fr_FR"
605 nigel 25
606     in the comparison output, it means that locale is not available on your system,
607     despite being listed by "locale". This does not mean that PCRE is broken.
608    
609 ph10 142 [If you are trying to run this test on Windows, you may be able to get it to
610 ph10 260 work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
611     RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
612     Windows versions of test 2. More info on using RunTest.bat is included in the
613     document entitled NON-UNIX-USE.]
614 ph10 139
615 ph10 672 The fourth test checks the UTF-8 support. This file can be also fed directly to
616     the perltest.pl script, provided you are running Perl 5.8 or higher.
617 nigel 3
618 nigel 75 The fifth test checks error handling with UTF-8 encoding, and internal UTF-8
619     features of PCRE that are not relevant to Perl.
620 nigel 3
621 ph10 461 The sixth test (which is Perl-5.10 compatible) checks the support for Unicode
622 ph10 672 character properties. This file can be also fed directly to the perltest.pl
623     script, provided you are running Perl 5.10 or higher.
624 nigel 63
625 nigel 77 The seventh, eighth, and ninth tests check the pcre_dfa_exec() alternative
626     matching function, in non-UTF-8 mode, UTF-8 mode, and UTF-8 mode with Unicode
627 ph10 672 property support, respectively.
628 nigel 75
629 ph10 461 The tenth test checks some internal offsets and code size features; it is run
630     only when the default "link size" of 2 is set (in other cases the sizes
631 ph10 672 change) and when Unicode property support is enabled.
632 nigel 77
633 ph10 672 The eleventh and twelfth tests check out features that are new in Perl 5.10,
634     without and with UTF-8 support, respectively. This file can be also fed
635     directly to the perltest.pl script, provided you are running Perl 5.10 or
636     higher.
637 ph10 461
638 ph10 672 The thirteenth test checks a number internals and non-Perl features concerned
639     with Unicode property support.
640 ph10 461
641 ph10 691 The fourteenth test is run only when JIT support is available, and the
642     fifteenth test is run only when JIT support is not available. They test some
643     JIT-specific features such as information output from pcretest about JIT
644 ph10 672 compilation.
645    
646    
647 nigel 3 Character tables
648     ----------------
649    
650 ph10 122 For speed, PCRE uses four tables for manipulating and identifying characters
651     whose code point values are less than 256. The final argument of the
652     pcre_compile() function is a pointer to a block of memory containing the
653     concatenated tables. A call to pcre_maketables() can be used to generate a set
654     of tables in the current locale. If the final argument for pcre_compile() is
655     passed as NULL, a set of default tables that is built into the binary is used.
656 nigel 3
657 ph10 128 The source file called pcre_chartables.c contains the default set of tables. By
658     default, this is created as a copy of pcre_chartables.c.dist, which contains
659     tables for ASCII coding. However, if --enable-rebuild-chartables is specified
660     for ./configure, a different version of pcre_chartables.c is built by the
661     program dftables (compiled from dftables.c), which uses the ANSI C character
662     handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
663     build the table sources. This means that the default C locale which is set for
664     your system will control the contents of these default tables. You can change
665     the default tables by editing pcre_chartables.c and then re-building PCRE. If
666     you do this, you should take care to ensure that the file does not get
667     automatically re-generated. The best way to do this is to move
668     pcre_chartables.c.dist out of the way and replace it with your customized
669     tables.
670 nigel 3
671 ph10 128 When the dftables program is run as a result of --enable-rebuild-chartables,
672     it uses the default C locale that is set on your system. It does not pay
673     attention to the LC_xxx environment variables. In other words, it uses the
674     system's default locale rather than whatever the compiling user happens to have
675     set. If you really do want to build a source set of character tables in a
676     locale that is specified by the LC_xxx variables, you can run the dftables
677     program by hand with the -L option. For example:
678    
679     ./dftables -L pcre_chartables.c.special
680    
681 nigel 25 The first two 256-byte tables provide lower casing and case flipping functions,
682     respectively. The next table consists of three 32-byte bit maps which identify
683     digits, "word" characters, and white space, respectively. These are used when
684 ph10 111 building 32-byte bit maps that represent character classes for code points less
685 ph10 109 than 256.
686 nigel 25
687     The final 256-byte table has bits indicating various character types, as
688 nigel 3 follows:
689    
690     1 white space character
691     2 letter
692     4 decimal digit
693     8 hexadecimal digit
694     16 alphanumeric or '_'
695     128 regular expression metacharacter or binary zero
696    
697     You should not alter the set of characters that contain the 128 bit, as that
698     will cause PCRE to malfunction.
699    
700    
701 ph10 109 File manifest
702     -------------
703 nigel 3
704 nigel 41 The distribution should contain the following files:
705 nigel 3
706 ph10 109 (A) Source files of the PCRE library functions and their headers:
707 nigel 3
708 ph10 128 dftables.c auxiliary program for building pcre_chartables.c
709     when --enable-rebuild-chartables is specified
710 ph10 111
711 ph10 128 pcre_chartables.c.dist a default set of character tables that assume ASCII
712     coding; used, unless --enable-rebuild-chartables is
713     specified, by copying to pcre_chartables.c
714 ph10 111
715 ph10 128 pcreposix.c )
716 ph10 836 pcre_byte_order.c )
717 ph10 128 pcre_compile.c )
718     pcre_config.c )
719     pcre_dfa_exec.c )
720     pcre_exec.c )
721     pcre_fullinfo.c )
722     pcre_get.c ) sources for the functions in the library,
723     pcre_globals.c ) and some internal functions that they use
724     pcre_info.c )
725 ph10 691 pcre_jit_compile.c )
726 ph10 128 pcre_maketables.c )
727     pcre_newline.c )
728     pcre_ord2utf8.c )
729     pcre_refcount.c )
730     pcre_study.c )
731     pcre_tables.c )
732 ph10 374 pcre_ucd.c )
733 ph10 128 pcre_valid_utf8.c )
734     pcre_version.c )
735     pcre_xclass.c )
736     pcre_printint.src ) debugging function that is #included in pcretest,
737     ) and can also be #included in pcre_compile()
738     pcre.h.in template for pcre.h when built by "configure"
739     pcreposix.h header for the external POSIX wrapper API
740     pcre_internal.h header for internal use
741 ph10 691 sljit/* 16 files that make up the JIT compiler
742 ph10 374 ucp.h header for Unicode property handling
743 ph10 111
744 ph10 128 config.h.in template for config.h, which is built by "configure"
745 ph10 111
746 ph10 128 pcrecpp.h public header file for the C++ wrapper
747     pcrecpparg.h.in template for another C++ header file
748     pcre_scanner.h public header file for C++ scanner functions
749     pcrecpp.cc )
750     pcre_scanner.cc ) source for the C++ wrapper library
751 ph10 111
752 ph10 128 pcre_stringpiece.h.in template for pcre_stringpiece.h, the header for the
753     C++ stringpiece functions
754     pcre_stringpiece.cc source for the C++ stringpiece functions
755    
756 ph10 109 (B) Source files for programs that use PCRE:
757 nigel 75
758 ph10 128 pcredemo.c simple demonstration of coding calls to PCRE
759     pcregrep.c source of a grep utility that uses PCRE
760     pcretest.c comprehensive test program
761 ph10 111
762     (C) Auxiliary files:
763    
764 ph10 128 132html script to turn "man" pages into HTML
765     AUTHORS information about the author of PCRE
766     ChangeLog log of changes to the code
767     CleanTxt script to clean nroff output for txt man pages
768     Detrail script to remove trailing spaces
769     HACKING some notes about the internals of PCRE
770     INSTALL generic installation instructions
771     LICENCE conditions for the use of PCRE
772     COPYING the same, using GNU's standard name
773     Makefile.in ) template for Unix Makefile, which is built by
774     ) "configure"
775     Makefile.am ) the automake input that was used to create
776     ) Makefile.in
777     NEWS important changes in this release
778     NON-UNIX-USE notes on building PCRE on non-Unix systems
779     PrepareRelease script to make preparations for "make dist"
780     README this file
781 ph10 138 RunTest a Unix shell script for running tests
782     RunGrepTest a Unix shell script for pcregrep tests
783 ph10 128 aclocal.m4 m4 macros (generated by "aclocal")
784     config.guess ) files used by libtool,
785     config.sub ) used only when building a shared library
786     configure a configuring shell script (built by autoconf)
787     configure.ac ) the autoconf input that was used to build
788     ) "configure" and config.h
789     depcomp ) script to find program dependencies, generated by
790     ) automake
791 ph10 429 doc/*.3 man page sources for PCRE
792 ph10 128 doc/*.1 man page sources for pcregrep and pcretest
793     doc/index.html.src the base HTML page
794     doc/html/* HTML documentation
795     doc/pcre.txt plain text version of the man pages
796     doc/pcretest.txt plain text documentation of test program
797     doc/perltest.txt plain text documentation of Perl test program
798     install-sh a shell script for installing files
799     libpcre.pc.in template for libpcre.pc for pkg-config
800 ph10 461 libpcreposix.pc.in template for libpcreposix.pc for pkg-config
801 ph10 128 libpcrecpp.pc.in template for libpcrecpp.pc for pkg-config
802     ltmain.sh file used to build a libtool script
803     missing ) common stub for a few missing GNU programs while
804     ) installing, generated by automake
805     mkinstalldirs script for making install directories
806     perltest.pl Perl test program
807     pcre-config.in source of script which retains PCRE information
808 ph10 691 pcre_jit_test.c test program for the JIT compiler
809 ph10 111 pcrecpp_unittest.cc )
810     pcre_scanner_unittest.cc ) test programs for the C++ wrapper
811     pcre_stringpiece_unittest.cc )
812 ph10 128 testdata/testinput* test data for main library tests
813     testdata/testoutput* expected test results
814     testdata/grep* input and output for pcregrep tests
815 ph10 111
816 ph10 109 (D) Auxiliary files for cmake support
817 nigel 3
818 ph10 374 cmake/COPYING-CMAKE-SCRIPTS
819     cmake/FindPackageHandleStandardArgs.cmake
820     cmake/FindReadline.cmake
821 ph10 109 CMakeLists.txt
822 ph10 111 config-cmake.h.in
823 nigel 29
824 ph10 109 (E) Auxiliary files for VPASCAL
825 nigel 29
826 nigel 63 makevp.bat
827 ph10 135 makevp_c.txt
828     makevp_l.txt
829 ph10 111 pcregexp.pas
830    
831     (F) Auxiliary files for building PCRE "by hand"
832    
833 ph10 128 pcre.h.generic ) a version of the public PCRE header file
834     ) for use in non-"configure" environments
835     config.h.generic ) a version of config.h for use in non-"configure"
836     ) environments
837 ph10 111
838 ph10 109 (F) Miscellaneous
839 nigel 63
840 ph10 109 RunTest.bat a script for running tests under Windows
841    
842 nigel 77 Philip Hazel
843     Email local part: ph10
844     Email domain: cam.ac.uk
845 ph10 685 Last updated: 06 September 2011

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