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CMake support for linking pcretest with libedit.
1 README file for PCRE (Perl-compatible regular expression library)
2 -----------------------------------------------------------------
3
4 The latest release of PCRE is always available in three alternative formats
5 from:
6
7 ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.gz
8 ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.bz2
9 ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.zip
10
11 There is a mailing list for discussion about the development of PCRE at
12
13 pcre-dev@exim.org
14
15 Please read the NEWS file if you are upgrading from a previous release.
16 The contents of this README file are:
17
18 The PCRE APIs
19 Documentation for PCRE
20 Contributions by users of PCRE
21 Building PCRE on non-Unix systems
22 Building PCRE on Unix-like systems
23 Retrieving configuration information on Unix-like systems
24 Shared libraries on Unix-like systems
25 Cross-compiling on Unix-like systems
26 Using HP's ANSI C++ compiler (aCC)
27 Using PCRE from MySQL
28 Making new tarballs
29 Testing PCRE
30 Character tables
31 File manifest
32
33
34 The PCRE APIs
35 -------------
36
37 PCRE is written in C, and it has its own API. There are two sets of functions,
38 one for the 8-bit library, which processes strings of bytes, and one for the
39 16-bit library, which processes strings of 16-bit values. The distribution also
40 includes a set of C++ wrapper functions (see the pcrecpp man page for details),
41 courtesy of Google Inc., which can be used to call the 8-bit PCRE library from
42 C++.
43
44 In addition, there is a set of C wrapper functions (again, just for the 8-bit
45 library) that are based on the POSIX regular expression API (see the pcreposix
46 man page). These end up in the library called libpcreposix. Note that this just
47 provides a POSIX calling interface to PCRE; the regular expressions themselves
48 still follow Perl syntax and semantics. The POSIX API is restricted, and does
49 not give full access to all of PCRE's facilities.
50
51 The header file for the POSIX-style functions is called pcreposix.h. The
52 official POSIX name is regex.h, but I did not want to risk possible problems
53 with existing files of that name by distributing it that way. To use PCRE with
54 an existing program that uses the POSIX API, pcreposix.h will have to be
55 renamed or pointed at by a link.
56
57 If you are using the POSIX interface to PCRE and there is already a POSIX regex
58 library installed on your system, as well as worrying about the regex.h header
59 file (as mentioned above), you must also take care when linking programs to
60 ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
61 up the POSIX functions of the same name from the other library.
62
63 One way of avoiding this confusion is to compile PCRE with the addition of
64 -Dregcomp=PCREregcomp (and similarly for the other POSIX functions) to the
65 compiler flags (CFLAGS if you are using "configure" -- see below). This has the
66 effect of renaming the functions so that the names no longer clash. Of course,
67 you have to do the same thing for your applications, or write them using the
68 new names.
69
70
71 Documentation for PCRE
72 ----------------------
73
74 If you install PCRE in the normal way on a Unix-like system, you will end up
75 with a set of man pages whose names all start with "pcre". The one that is just
76 called "pcre" lists all the others. In addition to these man pages, the PCRE
77 documentation is supplied in two other forms:
78
79 1. There are files called doc/pcre.txt, doc/pcregrep.txt, and
80 doc/pcretest.txt in the source distribution. The first of these is a
81 concatenation of the text forms of all the section 3 man pages except
82 those that summarize individual functions. The other two are the text
83 forms of the section 1 man pages for the pcregrep and pcretest commands.
84 These text forms are provided for ease of scanning with text editors or
85 similar tools. They are installed in <prefix>/share/doc/pcre, where
86 <prefix> is the installation prefix (defaulting to /usr/local).
87
88 2. A set of files containing all the documentation in HTML form, hyperlinked
89 in various ways, and rooted in a file called index.html, is distributed in
90 doc/html and installed in <prefix>/share/doc/pcre/html.
91
92 Users of PCRE have contributed files containing the documentation for various
93 releases in CHM format. These can be found in the Contrib directory of the FTP
94 site (see next section).
95
96
97 Contributions by users of PCRE
98 ------------------------------
99
100 You can find contributions from PCRE users in the directory
101
102 ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
103
104 There is a README file giving brief descriptions of what they are. Some are
105 complete in themselves; others are pointers to URLs containing relevant files.
106 Some of this material is likely to be well out-of-date. Several of the earlier
107 contributions provided support for compiling PCRE on various flavours of
108 Windows (I myself do not use Windows). Nowadays there is more Windows support
109 in the standard distribution, so these contibutions have been archived.
110
111
112 Building PCRE on non-Unix systems
113 ---------------------------------
114
115 For a non-Unix system, please read the comments in the file NON-UNIX-USE,
116 though if your system supports the use of "configure" and "make" you may be
117 able to build PCRE in the same way as for Unix-like systems. PCRE can also be
118 configured in many platform environments using the GUI facility provided by
119 CMake's cmake-gui command. This creates Makefiles, solution files, etc.
120
121 PCRE has been compiled on many different operating systems. It should be
122 straightforward to build PCRE on any system that has a Standard C compiler and
123 library, because it uses only Standard C functions.
124
125
126 Building PCRE on Unix-like systems
127 ----------------------------------
128
129 If you are using HP's ANSI C++ compiler (aCC), please see the special note
130 in the section entitled "Using HP's ANSI C++ compiler (aCC)" below.
131
132 The following instructions assume the use of the widely used "configure, make,
133 make install" process. There is also support for CMake in the PCRE
134 distribution; there are some comments about using CMake in the NON-UNIX-USE
135 file, though it can also be used in Unix-like systems.
136
137 To build PCRE on a Unix-like system, first run the "configure" command from the
138 PCRE distribution directory, with your current directory set to the directory
139 where you want the files to be created. This command is a standard GNU
140 "autoconf" configuration script, for which generic instructions are supplied in
141 the file INSTALL.
142
143 Most commonly, people build PCRE within its own distribution directory, and in
144 this case, on many systems, just running "./configure" is sufficient. However,
145 the usual methods of changing standard defaults are available. For example:
146
147 CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
148
149 This command specifies that the C compiler should be run with the flags '-O2
150 -Wall' instead of the default, and that "make install" should install PCRE
151 under /opt/local instead of the default /usr/local.
152
153 If you want to build in a different directory, just run "configure" with that
154 directory as current. For example, suppose you have unpacked the PCRE source
155 into /source/pcre/pcre-xxx, but you want to build it in /build/pcre/pcre-xxx:
156
157 cd /build/pcre/pcre-xxx
158 /source/pcre/pcre-xxx/configure
159
160 PCRE is written in C and is normally compiled as a C library. However, it is
161 possible to build it as a C++ library, though the provided building apparatus
162 does not have any features to support this.
163
164 There are some optional features that can be included or omitted from the PCRE
165 library. They are also documented in the pcrebuild man page.
166
167 . By default, both shared and static libraries are built. You can change this
168 by adding one of these options to the "configure" command:
169
170 --disable-shared
171 --disable-static
172
173 (See also "Shared libraries on Unix-like systems" below.)
174
175 . By default, only the 8-bit library is built. If you add --enable-pcre16 to
176 the "configure" command, the 16-bit library is also built. If you want only
177 the 16-bit library, use "./configure --enable-pcre16 --disable-pcre8".
178
179 . If you are building the 8-bit library and want to suppress the building of
180 the C++ wrapper library, you can add --disable-cpp to the "configure"
181 command. Otherwise, when "configure" is run without --disable-pcre8, it will
182 try to find a C++ compiler and C++ header files, and if it succeeds, it will
183 try to build the C++ wrapper.
184
185 . If you want to include support for just-in-time compiling, which can give
186 large performance improvements on certain platforms, add --enable-jit to the
187 "configure" command. This support is available only for certain hardware
188 architectures. If you try to enable it on an unsupported architecture, there
189 will be a compile time error.
190
191 . When JIT support is enabled, pcregrep automatically makes use of it, unless
192 you add --disable-pcregrep-jit to the "configure" command.
193
194 . If you want to make use of the support for UTF-8 Unicode character strings in
195 the 8-bit library, or UTF-16 Unicode character strings in the 16-bit library,
196 you must add --enable-utf to the "configure" command. Without it, the code
197 for handling UTF-8 and UTF-16 is not included in the relevant library. Even
198 when --enable-utf is included, the use of a UTF encoding still has to be
199 enabled by an option at run time. When PCRE is compiled with this option, its
200 input can only either be ASCII or UTF-8/16, even when running on EBCDIC
201 platforms. It is not possible to use both --enable-utf and --enable-ebcdic at
202 the same time.
203
204 . There are no separate options for enabling UTF-8 and UTF-16 independently
205 because that would allow ridiculous settings such as requesting UTF-16
206 support while building only the 8-bit library. However, the option
207 --enable-utf8 is retained for backwards compatibility with earlier releases
208 that did not support 16-bit character strings. It is synonymous with
209 --enable-utf. It is not possible to configure one library with UTF support
210 and the other without in the same configuration.
211
212 . If, in addition to support for UTF-8/16 character strings, you want to
213 include support for the \P, \p, and \X sequences that recognize Unicode
214 character properties, you must add --enable-unicode-properties to the
215 "configure" command. This adds about 30K to the size of the library (in the
216 form of a property table); only the basic two-letter properties such as Lu
217 are supported.
218
219 . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
220 of the preceding, or any of the Unicode newline sequences as indicating the
221 end of a line. Whatever you specify at build time is the default; the caller
222 of PCRE can change the selection at run time. The default newline indicator
223 is a single LF character (the Unix standard). You can specify the default
224 newline indicator by adding --enable-newline-is-cr or --enable-newline-is-lf
225 or --enable-newline-is-crlf or --enable-newline-is-anycrlf or
226 --enable-newline-is-any to the "configure" command, respectively.
227
228 If you specify --enable-newline-is-cr or --enable-newline-is-crlf, some of
229 the standard tests will fail, because the lines in the test files end with
230 LF. Even if the files are edited to change the line endings, there are likely
231 to be some failures. With --enable-newline-is-anycrlf or
232 --enable-newline-is-any, many tests should succeed, but there may be some
233 failures.
234
235 . By default, the sequence \R in a pattern matches any Unicode line ending
236 sequence. This is independent of the option specifying what PCRE considers to
237 be the end of a line (see above). However, the caller of PCRE can restrict \R
238 to match only CR, LF, or CRLF. You can make this the default by adding
239 --enable-bsr-anycrlf to the "configure" command (bsr = "backslash R").
240
241 . When called via the POSIX interface, PCRE uses malloc() to get additional
242 storage for processing capturing parentheses if there are more than 10 of
243 them in a pattern. You can increase this threshold by setting, for example,
244
245 --with-posix-malloc-threshold=20
246
247 on the "configure" command.
248
249 . PCRE has a counter that can be set to limit the amount of resources it uses.
250 If the limit is exceeded during a match, the match fails. The default is ten
251 million. You can change the default by setting, for example,
252
253 --with-match-limit=500000
254
255 on the "configure" command. This is just the default; individual calls to
256 pcre_exec() can supply their own value. There is more discussion on the
257 pcreapi man page.
258
259 . There is a separate counter that limits the depth of recursive function calls
260 during a matching process. This also has a default of ten million, which is
261 essentially "unlimited". You can change the default by setting, for example,
262
263 --with-match-limit-recursion=500000
264
265 Recursive function calls use up the runtime stack; running out of stack can
266 cause programs to crash in strange ways. There is a discussion about stack
267 sizes in the pcrestack man page.
268
269 . The default maximum compiled pattern size is around 64K. You can increase
270 this by adding --with-link-size=3 to the "configure" command. In the 8-bit
271 library, PCRE then uses three bytes instead of two for offsets to different
272 parts of the compiled pattern. In the 16-bit library, --with-link-size=3 is
273 the same as --with-link-size=4, which (in both libraries) uses four-byte
274 offsets. Increasing the internal link size reduces performance.
275
276 . You can build PCRE so that its internal match() function that is called from
277 pcre_exec() does not call itself recursively. Instead, it uses memory blocks
278 obtained from the heap via the special functions pcre_stack_malloc() and
279 pcre_stack_free() to save data that would otherwise be saved on the stack. To
280 build PCRE like this, use
281
282 --disable-stack-for-recursion
283
284 on the "configure" command. PCRE runs more slowly in this mode, but it may be
285 necessary in environments with limited stack sizes. This applies only to the
286 normal execution of the pcre_exec() function; if JIT support is being
287 successfully used, it is not relevant. Equally, it does not apply to
288 pcre_dfa_exec(), which does not use deeply nested recursion. There is a
289 discussion about stack sizes in the pcrestack man page.
290
291 . For speed, PCRE uses four tables for manipulating and identifying characters
292 whose code point values are less than 256. By default, it uses a set of
293 tables for ASCII encoding that is part of the distribution. If you specify
294
295 --enable-rebuild-chartables
296
297 a program called dftables is compiled and run in the default C locale when
298 you obey "make". It builds a source file called pcre_chartables.c. If you do
299 not specify this option, pcre_chartables.c is created as a copy of
300 pcre_chartables.c.dist. See "Character tables" below for further information.
301
302 . It is possible to compile PCRE for use on systems that use EBCDIC as their
303 character code (as opposed to ASCII) by specifying
304
305 --enable-ebcdic
306
307 This automatically implies --enable-rebuild-chartables (see above). However,
308 when PCRE is built this way, it always operates in EBCDIC. It cannot support
309 both EBCDIC and UTF-8/16.
310
311 . The pcregrep program currently supports only 8-bit data files, and so
312 requires the 8-bit PCRE library. It is possible to compile pcregrep to use
313 libz and/or libbz2, in order to read .gz and .bz2 files (respectively), by
314 specifying one or both of
315
316 --enable-pcregrep-libz
317 --enable-pcregrep-libbz2
318
319 Of course, the relevant libraries must be installed on your system.
320
321 . The default size of internal buffer used by pcregrep can be set by, for
322 example:
323
324 --with-pcregrep-bufsize=50K
325
326 The default value is 20K.
327
328 . It is possible to compile pcretest so that it links with the libreadline
329 or libedit libraries, by specifying, respectively,
330
331 --enable-pcretest-libreadline or --enable-pcretest-libedit
332
333 If this is done, when pcretest's input is from a terminal, it reads it using
334 the readline() function. This provides line-editing and history facilities.
335 Note that libreadline is GPL-licenced, so if you distribute a binary of
336 pcretest linked in this way, there may be licensing issues. These can be
337 avoided by linking with libedit (which has a BSD licence) instead.
338
339 Enabling libreadline causes the -lreadline option to be added to the pcretest
340 build. In many operating environments with a sytem-installed readline
341 library this is sufficient. However, in some environments (e.g. if an
342 unmodified distribution version of readline is in use), it may be necessary
343 to specify something like LIBS="-lncurses" as well. This is because, to quote
344 the readline INSTALL, "Readline uses the termcap functions, but does not link
345 with the termcap or curses library itself, allowing applications which link
346 with readline the to choose an appropriate library." If you get error
347 messages about missing functions tgetstr, tgetent, tputs, tgetflag, or tgoto,
348 this is the problem, and linking with the ncurses library should fix it.
349
350 The "configure" script builds the following files for the basic C library:
351
352 . Makefile the makefile that builds the library
353 . config.h build-time configuration options for the library
354 . pcre.h the public PCRE header file
355 . pcre-config script that shows the building settings such as CFLAGS
356 that were set for "configure"
357 . libpcre.pc ) data for the pkg-config command
358 . libpcre16.pc )
359 . libpcreposix.pc )
360 . libtool script that builds shared and/or static libraries
361 . RunTest script for running tests on the basic C library
362 . RunGrepTest script for running tests on the pcregrep command
363
364 Versions of config.h and pcre.h are distributed in the PCRE tarballs under the
365 names config.h.generic and pcre.h.generic. These are provided for those who
366 have to built PCRE without using "configure" or CMake. If you use "configure"
367 or CMake, the .generic versions are not used.
368
369 When building the 8-bit library, if a C++ compiler is found, the following
370 files are also built:
371
372 . libpcrecpp.pc data for the pkg-config command
373 . pcrecpparg.h header file for calling PCRE via the C++ wrapper
374 . pcre_stringpiece.h header for the C++ "stringpiece" functions
375
376 The "configure" script also creates config.status, which is an executable
377 script that can be run to recreate the configuration, and config.log, which
378 contains compiler output from tests that "configure" runs.
379
380 Once "configure" has run, you can run "make". This builds either or both of the
381 libraries libpcre and libpcre16, and a test program called pcretest. If you
382 enabled JIT support with --enable-jit, a test program called pcre_jit_test is
383 built as well.
384
385 If the 8-bit library is built, libpcreposix and the pcregrep command are also
386 built, and if a C++ compiler was found on your system, and you did not disable
387 it with --disable-cpp, "make" builds the C++ wrapper library, which is called
388 libpcrecpp, as well as some test programs called pcrecpp_unittest,
389 pcre_scanner_unittest, and pcre_stringpiece_unittest.
390
391 The command "make check" runs all the appropriate tests. Details of the PCRE
392 tests are given below in a separate section of this document.
393
394 You can use "make install" to install PCRE into live directories on your
395 system. The following are installed (file names are all relative to the
396 <prefix> that is set when "configure" is run):
397
398 Commands (bin):
399 pcretest
400 pcregrep (if 8-bit support is enabled)
401 pcre-config
402
403 Libraries (lib):
404 libpcre16 (if 16-bit support is enabled)
405 libpcre (if 8-bit support is enabled)
406 libpcreposix (if 8-bit support is enabled)
407 libpcrecpp (if 8-bit and C++ support is enabled)
408
409 Configuration information (lib/pkgconfig):
410 libpcre16.pc
411 libpcre.pc
412 libpcreposix.pc
413 libpcrecpp.pc (if C++ support is enabled)
414
415 Header files (include):
416 pcre.h
417 pcreposix.h
418 pcre_scanner.h )
419 pcre_stringpiece.h ) if C++ support is enabled
420 pcrecpp.h )
421 pcrecpparg.h )
422
423 Man pages (share/man/man{1,3}):
424 pcregrep.1
425 pcretest.1
426 pcre-config.1
427 pcre.3
428 pcre*.3 (lots more pages, all starting "pcre")
429
430 HTML documentation (share/doc/pcre/html):
431 index.html
432 *.html (lots more pages, hyperlinked from index.html)
433
434 Text file documentation (share/doc/pcre):
435 AUTHORS
436 COPYING
437 ChangeLog
438 LICENCE
439 NEWS
440 README
441 pcre.txt (a concatenation of the man(3) pages)
442 pcretest.txt the pcretest man page
443 pcregrep.txt the pcregrep man page
444 pcre-config.txt the pcre-config man page
445
446 If you want to remove PCRE from your system, you can run "make uninstall".
447 This removes all the files that "make install" installed. However, it does not
448 remove any directories, because these are often shared with other programs.
449
450
451 Retrieving configuration information on Unix-like systems
452 ---------------------------------------------------------
453
454 Running "make install" installs the command pcre-config, which can be used to
455 recall information about the PCRE configuration and installation. For example:
456
457 pcre-config --version
458
459 prints the version number, and
460
461 pcre-config --libs
462
463 outputs information about where the library is installed. This command can be
464 included in makefiles for programs that use PCRE, saving the programmer from
465 having to remember too many details.
466
467 The pkg-config command is another system for saving and retrieving information
468 about installed libraries. Instead of separate commands for each library, a
469 single command is used. For example:
470
471 pkg-config --cflags pcre
472
473 The data is held in *.pc files that are installed in a directory called
474 <prefix>/lib/pkgconfig.
475
476
477 Shared libraries on Unix-like systems
478 -------------------------------------
479
480 The default distribution builds PCRE as shared libraries and static libraries,
481 as long as the operating system supports shared libraries. Shared library
482 support relies on the "libtool" script which is built as part of the
483 "configure" process.
484
485 The libtool script is used to compile and link both shared and static
486 libraries. They are placed in a subdirectory called .libs when they are newly
487 built. The programs pcretest and pcregrep are built to use these uninstalled
488 libraries (by means of wrapper scripts in the case of shared libraries). When
489 you use "make install" to install shared libraries, pcregrep and pcretest are
490 automatically re-built to use the newly installed shared libraries before being
491 installed themselves. However, the versions left in the build directory still
492 use the uninstalled libraries.
493
494 To build PCRE using static libraries only you must use --disable-shared when
495 configuring it. For example:
496
497 ./configure --prefix=/usr/gnu --disable-shared
498
499 Then run "make" in the usual way. Similarly, you can use --disable-static to
500 build only shared libraries.
501
502
503 Cross-compiling on Unix-like systems
504 ------------------------------------
505
506 You can specify CC and CFLAGS in the normal way to the "configure" command, in
507 order to cross-compile PCRE for some other host. However, you should NOT
508 specify --enable-rebuild-chartables, because if you do, the dftables.c source
509 file is compiled and run on the local host, in order to generate the inbuilt
510 character tables (the pcre_chartables.c file). This will probably not work,
511 because dftables.c needs to be compiled with the local compiler, not the cross
512 compiler.
513
514 When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
515 by making a copy of pcre_chartables.c.dist, which is a default set of tables
516 that assumes ASCII code. Cross-compiling with the default tables should not be
517 a problem.
518
519 If you need to modify the character tables when cross-compiling, you should
520 move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
521 run it on the local host to make a new version of pcre_chartables.c.dist.
522 Then when you cross-compile PCRE this new version of the tables will be used.
523
524
525 Using HP's ANSI C++ compiler (aCC)
526 ----------------------------------
527
528 Unless C++ support is disabled by specifying the "--disable-cpp" option of the
529 "configure" script, you must include the "-AA" option in the CXXFLAGS
530 environment variable in order for the C++ components to compile correctly.
531
532 Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
533 needed libraries fail to get included when specifying the "-AA" compiler
534 option. If you experience unresolved symbols when linking the C++ programs,
535 use the workaround of specifying the following environment variable prior to
536 running the "configure" script:
537
538 CXXLDFLAGS="-lstd_v2 -lCsup_v2"
539
540
541 Using Sun's compilers for Solaris
542 ---------------------------------
543
544 A user reports that the following configurations work on Solaris 9 sparcv9 and
545 Solaris 9 x86 (32-bit):
546
547 Solaris 9 sparcv9: ./configure --disable-cpp CC=/bin/cc CFLAGS="-m64 -g"
548 Solaris 9 x86: ./configure --disable-cpp CC=/bin/cc CFLAGS="-g"
549
550
551 Using PCRE from MySQL
552 ---------------------
553
554 On systems where both PCRE and MySQL are installed, it is possible to make use
555 of PCRE from within MySQL, as an alternative to the built-in pattern matching.
556 There is a web page that tells you how to do this:
557
558 http://www.mysqludf.org/lib_mysqludf_preg/index.php
559
560
561 Making new tarballs
562 -------------------
563
564 The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
565 zip formats. The command "make distcheck" does the same, but then does a trial
566 build of the new distribution to ensure that it works.
567
568 If you have modified any of the man page sources in the doc directory, you
569 should first run the PrepareRelease script before making a distribution. This
570 script creates the .txt and HTML forms of the documentation from the man pages.
571
572
573 Testing PCRE
574 ------------
575
576 To test the basic PCRE library on a Unix system, run the RunTest script that is
577 created by the configuring process. There is also a script called RunGrepTest
578 that tests the options of the pcregrep command. If the C++ wrapper library is
579 built, three test programs called pcrecpp_unittest, pcre_scanner_unittest, and
580 pcre_stringpiece_unittest are also built. When JIT support is enabled, another
581 test program called pcre_jit_test is built.
582
583 Both the scripts and all the program tests are run if you obey "make check" or
584 "make test". For other systems, see the instructions in NON-UNIX-USE.
585
586 The RunTest script runs the pcretest test program (which is documented in its
587 own man page) on each of the relevant testinput files in the testdata
588 directory, and compares the output with the contents of the corresponding
589 testoutput files. Some tests are relevant only when certain build-time options
590 were selected. For example, the tests for UTF-8/16 support are run only if
591 --enable-utf was used. RunTest outputs a comment when it skips a test.
592
593 Many of the tests that are not skipped are run up to three times. The second
594 run forces pcre_study() to be called for all patterns except for a few in some
595 tests that are marked "never study" (see the pcretest program for how this is
596 done). If JIT support is available, the non-DFA tests are run a third time,
597 this time with a forced pcre_study() with the PCRE_STUDY_JIT_COMPILE option.
598
599 When both 8-bit and 16-bit support is enabled, the entire set of tests is run
600 twice, once for each library. If you want to run just one set of tests, call
601 RunTest with either the -8 or -16 option.
602
603 RunTest uses a file called testtry to hold the main output from pcretest.
604 Other files whose names begin with "test" are used as working files in some
605 tests. To run pcretest on just one or more specific test files, give their
606 numbers as arguments to RunTest, for example:
607
608 RunTest 2 7 11
609
610 The first test file can be fed directly into the perltest.pl script to check
611 that Perl gives the same results. The only difference you should see is in the
612 first few lines, where the Perl version is given instead of the PCRE version.
613
614 The second set of tests check pcre_fullinfo(), pcre_study(),
615 pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
616 detection, and run-time flags that are specific to PCRE, as well as the POSIX
617 wrapper API. It also uses the debugging flags to check some of the internals of
618 pcre_compile().
619
620 If you build PCRE with a locale setting that is not the standard C locale, the
621 character tables may be different (see next paragraph). In some cases, this may
622 cause failures in the second set of tests. For example, in a locale where the
623 isprint() function yields TRUE for characters in the range 128-255, the use of
624 [:isascii:] inside a character class defines a different set of characters, and
625 this shows up in this test as a difference in the compiled code, which is being
626 listed for checking. Where the comparison test output contains [\x00-\x7f] the
627 test will contain [\x00-\xff], and similarly in some other cases. This is not a
628 bug in PCRE.
629
630 The third set of tests checks pcre_maketables(), the facility for building a
631 set of character tables for a specific locale and using them instead of the
632 default tables. The tests make use of the "fr_FR" (French) locale. Before
633 running the test, the script checks for the presence of this locale by running
634 the "locale" command. If that command fails, or if it doesn't include "fr_FR"
635 in the list of available locales, the third test cannot be run, and a comment
636 is output to say why. If running this test produces instances of the error
637
638 ** Failed to set locale "fr_FR"
639
640 in the comparison output, it means that locale is not available on your system,
641 despite being listed by "locale". This does not mean that PCRE is broken.
642
643 [If you are trying to run this test on Windows, you may be able to get it to
644 work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
645 RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
646 Windows versions of test 2. More info on using RunTest.bat is included in the
647 document entitled NON-UNIX-USE.]
648
649 The fourth and fifth tests check the UTF-8/16 support and error handling and
650 internal UTF features of PCRE that are not relevant to Perl, respectively. The
651 sixth and seventh tests do the same for Unicode character properties support.
652
653 The eighth, ninth, and tenth tests check the pcre_dfa_exec() alternative
654 matching function, in non-UTF-8/16 mode, UTF-8/16 mode, and UTF-8/16 mode with
655 Unicode property support, respectively.
656
657 The eleventh test checks some internal offsets and code size features; it is
658 run only when the default "link size" of 2 is set (in other cases the sizes
659 change) and when Unicode property support is enabled.
660
661 The twelfth test is run only when JIT support is available, and the thirteenth
662 test is run only when JIT support is not available. They test some JIT-specific
663 features such as information output from pcretest about JIT compilation.
664
665 The fourteenth, fifteenth, and sixteenth tests are run only in 8-bit mode, and
666 the seventeenth, eighteenth, and nineteenth tests are run only in 16-bit mode.
667 These are tests that generate different output in the two modes. They are for
668 general cases, UTF-8/16 support, and Unicode property support, respectively.
669
670 The twentieth test is run only in 16-bit mode. It tests some specific 16-bit
671 features of the DFA matching engine.
672
673 The twenty-first and twenty-second tests are run only in 16-bit mode, when the
674 link size is set to 2. They test reloading pre-compiled patterns.
675
676
677 Character tables
678 ----------------
679
680 For speed, PCRE uses four tables for manipulating and identifying characters
681 whose code point values are less than 256. The final argument of the
682 pcre_compile() function is a pointer to a block of memory containing the
683 concatenated tables. A call to pcre_maketables() can be used to generate a set
684 of tables in the current locale. If the final argument for pcre_compile() is
685 passed as NULL, a set of default tables that is built into the binary is used.
686
687 The source file called pcre_chartables.c contains the default set of tables. By
688 default, this is created as a copy of pcre_chartables.c.dist, which contains
689 tables for ASCII coding. However, if --enable-rebuild-chartables is specified
690 for ./configure, a different version of pcre_chartables.c is built by the
691 program dftables (compiled from dftables.c), which uses the ANSI C character
692 handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
693 build the table sources. This means that the default C locale which is set for
694 your system will control the contents of these default tables. You can change
695 the default tables by editing pcre_chartables.c and then re-building PCRE. If
696 you do this, you should take care to ensure that the file does not get
697 automatically re-generated. The best way to do this is to move
698 pcre_chartables.c.dist out of the way and replace it with your customized
699 tables.
700
701 When the dftables program is run as a result of --enable-rebuild-chartables,
702 it uses the default C locale that is set on your system. It does not pay
703 attention to the LC_xxx environment variables. In other words, it uses the
704 system's default locale rather than whatever the compiling user happens to have
705 set. If you really do want to build a source set of character tables in a
706 locale that is specified by the LC_xxx variables, you can run the dftables
707 program by hand with the -L option. For example:
708
709 ./dftables -L pcre_chartables.c.special
710
711 The first two 256-byte tables provide lower casing and case flipping functions,
712 respectively. The next table consists of three 32-byte bit maps which identify
713 digits, "word" characters, and white space, respectively. These are used when
714 building 32-byte bit maps that represent character classes for code points less
715 than 256.
716
717 The final 256-byte table has bits indicating various character types, as
718 follows:
719
720 1 white space character
721 2 letter
722 4 decimal digit
723 8 hexadecimal digit
724 16 alphanumeric or '_'
725 128 regular expression metacharacter or binary zero
726
727 You should not alter the set of characters that contain the 128 bit, as that
728 will cause PCRE to malfunction.
729
730
731 File manifest
732 -------------
733
734 The distribution should contain the files listed below. Where a file name is
735 given as pcre[16]_xxx it means that there are two files, one with the name
736 pcre_xxx and the other with the name pcre16_xxx.
737
738 (A) Source files of the PCRE library functions and their headers:
739
740 dftables.c auxiliary program for building pcre_chartables.c
741 when --enable-rebuild-chartables is specified
742
743 pcre_chartables.c.dist a default set of character tables that assume ASCII
744 coding; used, unless --enable-rebuild-chartables is
745 specified, by copying to pcre[16]_chartables.c
746
747 pcreposix.c )
748 pcre[16]_byte_order.c )
749 pcre[16]_compile.c )
750 pcre[16]_config.c )
751 pcre[16]_dfa_exec.c )
752 pcre[16]_exec.c )
753 pcre[16]_fullinfo.c )
754 pcre[16]_get.c ) sources for the functions in the library,
755 pcre[16]_globals.c ) and some internal functions that they use
756 pcre[16]_jit_compile.c )
757 pcre[16]_maketables.c )
758 pcre[16]_newline.c )
759 pcre[16]_refcount.c )
760 pcre[16]_string_utils.c )
761 pcre[16]_study.c )
762 pcre[16]_tables.c )
763 pcre[16]_ucd.c )
764 pcre[16]_version.c )
765 pcre[16]_xclass.c )
766 pcre_ord2utf8.c )
767 pcre_valid_utf8.c )
768 pcre16_ord2utf16.c )
769 pcre16_utf16_utils.c )
770 pcre16_valid_utf16.c )
771
772 pcre[16]_printint.c ) debugging function that is used by pcretest,
773 ) and can also be #included in pcre_compile()
774
775 pcre.h.in template for pcre.h when built by "configure"
776 pcreposix.h header for the external POSIX wrapper API
777 pcre_internal.h header for internal use
778 sljit/* 16 files that make up the JIT compiler
779 ucp.h header for Unicode property handling
780
781 config.h.in template for config.h, which is built by "configure"
782
783 pcrecpp.h public header file for the C++ wrapper
784 pcrecpparg.h.in template for another C++ header file
785 pcre_scanner.h public header file for C++ scanner functions
786 pcrecpp.cc )
787 pcre_scanner.cc ) source for the C++ wrapper library
788
789 pcre_stringpiece.h.in template for pcre_stringpiece.h, the header for the
790 C++ stringpiece functions
791 pcre_stringpiece.cc source for the C++ stringpiece functions
792
793 (B) Source files for programs that use PCRE:
794
795 pcredemo.c simple demonstration of coding calls to PCRE
796 pcregrep.c source of a grep utility that uses PCRE
797 pcretest.c comprehensive test program
798
799 (C) Auxiliary files:
800
801 132html script to turn "man" pages into HTML
802 AUTHORS information about the author of PCRE
803 ChangeLog log of changes to the code
804 CleanTxt script to clean nroff output for txt man pages
805 Detrail script to remove trailing spaces
806 HACKING some notes about the internals of PCRE
807 INSTALL generic installation instructions
808 LICENCE conditions for the use of PCRE
809 COPYING the same, using GNU's standard name
810 Makefile.in ) template for Unix Makefile, which is built by
811 ) "configure"
812 Makefile.am ) the automake input that was used to create
813 ) Makefile.in
814 NEWS important changes in this release
815 NON-UNIX-USE notes on building PCRE on non-Unix systems
816 PrepareRelease script to make preparations for "make dist"
817 README this file
818 RunTest a Unix shell script for running tests
819 RunGrepTest a Unix shell script for pcregrep tests
820 aclocal.m4 m4 macros (generated by "aclocal")
821 config.guess ) files used by libtool,
822 config.sub ) used only when building a shared library
823 configure a configuring shell script (built by autoconf)
824 configure.ac ) the autoconf input that was used to build
825 ) "configure" and config.h
826 depcomp ) script to find program dependencies, generated by
827 ) automake
828 doc/*.3 man page sources for PCRE
829 doc/*.1 man page sources for pcregrep and pcretest
830 doc/index.html.src the base HTML page
831 doc/html/* HTML documentation
832 doc/pcre.txt plain text version of the man pages
833 doc/pcretest.txt plain text documentation of test program
834 doc/perltest.txt plain text documentation of Perl test program
835 install-sh a shell script for installing files
836 libpcre16.pc.in template for libpcre16.pc for pkg-config
837 libpcre.pc.in template for libpcre.pc for pkg-config
838 libpcreposix.pc.in template for libpcreposix.pc for pkg-config
839 libpcrecpp.pc.in template for libpcrecpp.pc for pkg-config
840 ltmain.sh file used to build a libtool script
841 missing ) common stub for a few missing GNU programs while
842 ) installing, generated by automake
843 mkinstalldirs script for making install directories
844 perltest.pl Perl test program
845 pcre-config.in source of script which retains PCRE information
846 pcre_jit_test.c test program for the JIT compiler
847 pcrecpp_unittest.cc )
848 pcre_scanner_unittest.cc ) test programs for the C++ wrapper
849 pcre_stringpiece_unittest.cc )
850 testdata/testinput* test data for main library tests
851 testdata/testoutput* expected test results
852 testdata/grep* input and output for pcregrep tests
853 testdata/* other supporting test files
854
855 (D) Auxiliary files for cmake support
856
857 cmake/COPYING-CMAKE-SCRIPTS
858 cmake/FindPackageHandleStandardArgs.cmake
859 cmake/FindEditline.cmake
860 cmake/FindReadline.cmake
861 CMakeLists.txt
862 config-cmake.h.in
863
864 (E) Auxiliary files for VPASCAL
865
866 makevp.bat
867 makevp_c.txt
868 makevp_l.txt
869 pcregexp.pas
870
871 (F) Auxiliary files for building PCRE "by hand"
872
873 pcre.h.generic ) a version of the public PCRE header file
874 ) for use in non-"configure" environments
875 config.h.generic ) a version of config.h for use in non-"configure"
876 ) environments
877
878 (F) Miscellaneous
879
880 RunTest.bat a script for running tests under Windows
881
882 Philip Hazel
883 Email local part: ph10
884 Email domain: cam.ac.uk
885 Last updated: 26 February 2012

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