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1 README file for PCRE (Perl-compatible regular expression library)
2 -----------------------------------------------------------------
3
4 The latest release of PCRE is always available from
5
6 ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-xxx.tar.gz
7
8 There is a mailing list for discussion about the development of PCRE at
9
10 pcre-dev@exim.org
11
12 Please read the NEWS file if you are upgrading from a previous release.
13 The contents of this README file are:
14
15 The PCRE APIs
16 Documentation for PCRE
17 Contributions by users of PCRE
18 Building PCRE on non-Unix systems
19 Building PCRE on Unix-like systems
20 Retrieving configuration information on Unix-like systems
21 Shared libraries on Unix-like systems
22 Cross-compiling on Unix-like systems
23 Using HP's ANSI C++ compiler (aCC)
24 Making new tarballs
25 Testing PCRE
26 Character tables
27 File manifest
28
29
30 The PCRE APIs
31 -------------
32
33 PCRE is written in C, and it has its own API. The distribution also includes a
34 set of C++ wrapper functions (see the pcrecpp man page for details), courtesy
35 of Google Inc.
36
37 In addition, there is a set of C wrapper functions that are based on the POSIX
38 regular expression API (see the pcreposix man page). These end up in the
39 library called libpcreposix. Note that this just provides a POSIX calling
40 interface to PCRE; the regular expressions themselves still follow Perl syntax
41 and semantics. The POSIX API is restricted, and does not give full access to
42 all of PCRE's facilities.
43
44 The header file for the POSIX-style functions is called pcreposix.h. The
45 official POSIX name is regex.h, but I did not want to risk possible problems
46 with existing files of that name by distributing it that way. To use PCRE with
47 an existing program that uses the POSIX API, pcreposix.h will have to be
48 renamed or pointed at by a link.
49
50 If you are using the POSIX interface to PCRE and there is already a POSIX regex
51 library installed on your system, as well as worrying about the regex.h header
52 file (as mentioned above), you must also take care when linking programs to
53 ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
54 up the POSIX functions of the same name from the other library.
55
56 One way of avoiding this confusion is to compile PCRE with the addition of
57 -Dregcomp=PCREregcomp (and similarly for the other POSIX functions) to the
58 compiler flags (CFLAGS if you are using "configure" -- see below). This has the
59 effect of renaming the functions so that the names no longer clash. Of course,
60 you have to do the same thing for your applications, or write them using the
61 new names.
62
63
64 Documentation for PCRE
65 ----------------------
66
67 If you install PCRE in the normal way on a Unix-like system, you will end up
68 with a set of man pages whose names all start with "pcre". The one that is just
69 called "pcre" lists all the others. In addition to these man pages, the PCRE
70 documentation is supplied in two other forms:
71
72 1. There are files called doc/pcre.txt, doc/pcregrep.txt, and
73 doc/pcretest.txt in the source distribution. The first of these is a
74 concatenation of the text forms of all the section 3 man pages except
75 those that summarize individual functions. The other two are the text
76 forms of the section 1 man pages for the pcregrep and pcretest commands.
77 These text forms are provided for ease of scanning with text editors or
78 similar tools. They are installed in <prefix>/share/doc/pcre, where
79 <prefix> is the installation prefix (defaulting to /usr/local).
80
81 2. A set of files containing all the documentation in HTML form, hyperlinked
82 in various ways, and rooted in a file called index.html, is distributed in
83 doc/html and installed in <prefix>/share/doc/pcre/html.
84
85
86 Contributions by users of PCRE
87 ------------------------------
88
89 You can find contributions from PCRE users in the directory
90
91 ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
92
93 There is a README file giving brief descriptions of what they are. Some are
94 complete in themselves; others are pointers to URLs containing relevant files.
95 Some of this material is likely to be well out-of-date. Several of the earlier
96 contributions provided support for compiling PCRE on various flavours of
97 Windows (I myself do not use Windows). Nowadays there is more Windows support
98 in the standard distribution, so these contibutions have been archived.
99
100
101 Building PCRE on non-Unix systems
102 ---------------------------------
103
104 For a non-Unix system, please read the comments in the file NON-UNIX-USE,
105 though if your system supports the use of "configure" and "make" you may be
106 able to build PCRE in the same way as for Unix-like systems. PCRE can also be
107 configured in many platform environments using the GUI facility of CMake's
108 CMakeSetup. It creates Makefiles, solution files, etc.
109
110 PCRE has been compiled on many different operating systems. It should be
111 straightforward to build PCRE on any system that has a Standard C compiler and
112 library, because it uses only Standard C functions.
113
114
115 Building PCRE on Unix-like systems
116 ----------------------------------
117
118 If you are using HP's ANSI C++ compiler (aCC), please see the special note
119 in the section entitled "Using HP's ANSI C++ compiler (aCC)" below.
120
121 The following instructions assume the use of the widely used "configure, make,
122 make install" process. There is also support for CMake in the PCRE
123 distribution; there are some comments about using CMake in the NON-UNIX-USE
124 file, though it can also be used in Unix-like systems.
125
126 To build PCRE on a Unix-like system, first run the "configure" command from the
127 PCRE distribution directory, with your current directory set to the directory
128 where you want the files to be created. This command is a standard GNU
129 "autoconf" configuration script, for which generic instructions are supplied in
130 the file INSTALL.
131
132 Most commonly, people build PCRE within its own distribution directory, and in
133 this case, on many systems, just running "./configure" is sufficient. However,
134 the usual methods of changing standard defaults are available. For example:
135
136 CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
137
138 specifies that the C compiler should be run with the flags '-O2 -Wall' instead
139 of the default, and that "make install" should install PCRE under /opt/local
140 instead of the default /usr/local.
141
142 If you want to build in a different directory, just run "configure" with that
143 directory as current. For example, suppose you have unpacked the PCRE source
144 into /source/pcre/pcre-xxx, but you want to build it in /build/pcre/pcre-xxx:
145
146 cd /build/pcre/pcre-xxx
147 /source/pcre/pcre-xxx/configure
148
149 PCRE is written in C and is normally compiled as a C library. However, it is
150 possible to build it as a C++ library, though the provided building apparatus
151 does not have any features to support this.
152
153 There are some optional features that can be included or omitted from the PCRE
154 library. You can read more about them in the pcrebuild man page.
155
156 . If you want to suppress the building of the C++ wrapper library, you can add
157 --disable-cpp to the "configure" command. Otherwise, when "configure" is run,
158 it will try to find a C++ compiler and C++ header files, and if it succeeds,
159 it will try to build the C++ wrapper.
160
161 . If you want to make use of the support for UTF-8 character strings in PCRE,
162 you must add --enable-utf8 to the "configure" command. Without it, the code
163 for handling UTF-8 is not included in the library. (Even when included, it
164 still has to be enabled by an option at run time.)
165
166 . If, in addition to support for UTF-8 character strings, you want to include
167 support for the \P, \p, and \X sequences that recognize Unicode character
168 properties, you must add --enable-unicode-properties to the "configure"
169 command. This adds about 30K to the size of the library (in the form of a
170 property table); only the basic two-letter properties such as Lu are
171 supported.
172
173 . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
174 of the preceding, or any of the Unicode newline sequences as indicating the
175 end of a line. Whatever you specify at build time is the default; the caller
176 of PCRE can change the selection at run time. The default newline indicator
177 is a single LF character (the Unix standard). You can specify the default
178 newline indicator by adding --enable-newline-is-cr or --enable-newline-is-lf
179 or --enable-newline-is-crlf or --enable-newline-is-anycrlf or
180 --enable-newline-is-any to the "configure" command, respectively.
181
182 If you specify --enable-newline-is-cr or --enable-newline-is-crlf, some of
183 the standard tests will fail, because the lines in the test files end with
184 LF. Even if the files are edited to change the line endings, there are likely
185 to be some failures. With --enable-newline-is-anycrlf or
186 --enable-newline-is-any, many tests should succeed, but there may be some
187 failures.
188
189 . By default, the sequence \R in a pattern matches any Unicode line ending
190 sequence. This is independent of the option specifying what PCRE considers to
191 be the end of a line (see above). However, the caller of PCRE can restrict \R
192 to match only CR, LF, or CRLF. You can make this the default by adding
193 --enable-bsr-anycrlf to the "configure" command (bsr = "backslash R").
194
195 . When called via the POSIX interface, PCRE uses malloc() to get additional
196 storage for processing capturing parentheses if there are more than 10 of
197 them in a pattern. You can increase this threshold by setting, for example,
198
199 --with-posix-malloc-threshold=20
200
201 on the "configure" command.
202
203 . PCRE has a counter that can be set to limit the amount of resources it uses.
204 If the limit is exceeded during a match, the match fails. The default is ten
205 million. You can change the default by setting, for example,
206
207 --with-match-limit=500000
208
209 on the "configure" command. This is just the default; individual calls to
210 pcre_exec() can supply their own value. There is more discussion on the
211 pcreapi man page.
212
213 . There is a separate counter that limits the depth of recursive function calls
214 during a matching process. This also has a default of ten million, which is
215 essentially "unlimited". You can change the default by setting, for example,
216
217 --with-match-limit-recursion=500000
218
219 Recursive function calls use up the runtime stack; running out of stack can
220 cause programs to crash in strange ways. There is a discussion about stack
221 sizes in the pcrestack man page.
222
223 . The default maximum compiled pattern size is around 64K. You can increase
224 this by adding --with-link-size=3 to the "configure" command. You can
225 increase it even more by setting --with-link-size=4, but this is unlikely
226 ever to be necessary. Increasing the internal link size will reduce
227 performance.
228
229 . You can build PCRE so that its internal match() function that is called from
230 pcre_exec() does not call itself recursively. Instead, it uses memory blocks
231 obtained from the heap via the special functions pcre_stack_malloc() and
232 pcre_stack_free() to save data that would otherwise be saved on the stack. To
233 build PCRE like this, use
234
235 --disable-stack-for-recursion
236
237 on the "configure" command. PCRE runs more slowly in this mode, but it may be
238 necessary in environments with limited stack sizes. This applies only to the
239 pcre_exec() function; it does not apply to pcre_dfa_exec(), which does not
240 use deeply nested recursion. There is a discussion about stack sizes in the
241 pcrestack man page.
242
243 . For speed, PCRE uses four tables for manipulating and identifying characters
244 whose code point values are less than 256. By default, it uses a set of
245 tables for ASCII encoding that is part of the distribution. If you specify
246
247 --enable-rebuild-chartables
248
249 a program called dftables is compiled and run in the default C locale when
250 you obey "make". It builds a source file called pcre_chartables.c. If you do
251 not specify this option, pcre_chartables.c is created as a copy of
252 pcre_chartables.c.dist. See "Character tables" below for further information.
253
254 . It is possible to compile PCRE for use on systems that use EBCDIC as their
255 default character code (as opposed to ASCII) by specifying
256
257 --enable-ebcdic
258
259 This automatically implies --enable-rebuild-chartables (see above).
260
261 . It is possible to compile pcregrep to use libz and/or libbz2, in order to
262 read .gz and .bz2 files (respectively), by specifying one or both of
263
264 --enable-pcregrep-libz
265 --enable-pcregrep-libbz2
266
267 Of course, the relevant libraries must be installed on your system.
268
269 . It is possible to compile pcretest so that it links with the libreadline
270 library, by specifying
271
272 --enable-pcretest-libreadline
273
274 If this is done, when pcretest's input is from a terminal, it reads it using
275 the readline() function. This provides line-editing and history facilities.
276 Note that libreadline is GPL-licenced, so if you distribute a binary of
277 pcretest linked in this way, there may be licensing issues.
278
279 Setting this option causes the -lreadline option to be added to the pcretest
280 build. In many operating environments with a sytem-installed readline
281 library this is sufficient. However, in some environments (e.g. if an
282 unmodified distribution version of readline is in use), it may be necessary
283 to specify something like LIBS="-lncurses" as well. This is because, to quote
284 the readline INSTALL, "Readline uses the termcap functions, but does not link
285 with the termcap or curses library itself, allowing applications which link
286 with readline the to choose an appropriate library."
287
288 The "configure" script builds the following files for the basic C library:
289
290 . Makefile is the makefile that builds the library
291 . config.h contains build-time configuration options for the library
292 . pcre.h is the public PCRE header file
293 . pcre-config is a script that shows the settings of "configure" options
294 . libpcre.pc is data for the pkg-config command
295 . libtool is a script that builds shared and/or static libraries
296 . RunTest is a script for running tests on the basic C library
297 . RunGrepTest is a script for running tests on the pcregrep command
298
299 Versions of config.h and pcre.h are distributed in the PCRE tarballs under
300 the names config.h.generic and pcre.h.generic. These are provided for the
301 benefit of those who have to built PCRE without the benefit of "configure". If
302 you use "configure", the .generic versions are not used.
303
304 If a C++ compiler is found, the following files are also built:
305
306 . libpcrecpp.pc is data for the pkg-config command
307 . pcrecpparg.h is a header file for programs that call PCRE via the C++ wrapper
308 . pcre_stringpiece.h is the header for the C++ "stringpiece" functions
309
310 The "configure" script also creates config.status, which is an executable
311 script that can be run to recreate the configuration, and config.log, which
312 contains compiler output from tests that "configure" runs.
313
314 Once "configure" has run, you can run "make". It builds two libraries, called
315 libpcre and libpcreposix, a test program called pcretest, and the pcregrep
316 command. If a C++ compiler was found on your system, "make" also builds the C++
317 wrapper library, which is called libpcrecpp, and some test programs called
318 pcrecpp_unittest, pcre_scanner_unittest, and pcre_stringpiece_unittest.
319 Building the C++ wrapper can be disabled by adding --disable-cpp to the
320 "configure" command.
321
322 The command "make check" runs all the appropriate tests. Details of the PCRE
323 tests are given below in a separate section of this document.
324
325 You can use "make install" to install PCRE into live directories on your
326 system. The following are installed (file names are all relative to the
327 <prefix> that is set when "configure" is run):
328
329 Commands (bin):
330 pcretest
331 pcregrep
332 pcre-config
333
334 Libraries (lib):
335 libpcre
336 libpcreposix
337 libpcrecpp (if C++ support is enabled)
338
339 Configuration information (lib/pkgconfig):
340 libpcre.pc
341 libpcrecpp.pc (if C++ support is enabled)
342
343 Header files (include):
344 pcre.h
345 pcreposix.h
346 pcre_scanner.h )
347 pcre_stringpiece.h ) if C++ support is enabled
348 pcrecpp.h )
349 pcrecpparg.h )
350
351 Man pages (share/man/man{1,3}):
352 pcregrep.1
353 pcretest.1
354 pcre.3
355 pcre*.3 (lots more pages, all starting "pcre")
356
357 HTML documentation (share/doc/pcre/html):
358 index.html
359 *.html (lots more pages, hyperlinked from index.html)
360
361 Text file documentation (share/doc/pcre):
362 AUTHORS
363 COPYING
364 ChangeLog
365 LICENCE
366 NEWS
367 README
368 pcre.txt (a concatenation of the man(3) pages)
369 pcretest.txt the pcretest man page
370 pcregrep.txt the pcregrep man page
371
372 If you want to remove PCRE from your system, you can run "make uninstall".
373 This removes all the files that "make install" installed. However, it does not
374 remove any directories, because these are often shared with other programs.
375
376
377 Retrieving configuration information on Unix-like systems
378 ---------------------------------------------------------
379
380 Running "make install" installs the command pcre-config, which can be used to
381 recall information about the PCRE configuration and installation. For example:
382
383 pcre-config --version
384
385 prints the version number, and
386
387 pcre-config --libs
388
389 outputs information about where the library is installed. This command can be
390 included in makefiles for programs that use PCRE, saving the programmer from
391 having to remember too many details.
392
393 The pkg-config command is another system for saving and retrieving information
394 about installed libraries. Instead of separate commands for each library, a
395 single command is used. For example:
396
397 pkg-config --cflags pcre
398
399 The data is held in *.pc files that are installed in a directory called
400 <prefix>/lib/pkgconfig.
401
402
403 Shared libraries on Unix-like systems
404 -------------------------------------
405
406 The default distribution builds PCRE as shared libraries and static libraries,
407 as long as the operating system supports shared libraries. Shared library
408 support relies on the "libtool" script which is built as part of the
409 "configure" process.
410
411 The libtool script is used to compile and link both shared and static
412 libraries. They are placed in a subdirectory called .libs when they are newly
413 built. The programs pcretest and pcregrep are built to use these uninstalled
414 libraries (by means of wrapper scripts in the case of shared libraries). When
415 you use "make install" to install shared libraries, pcregrep and pcretest are
416 automatically re-built to use the newly installed shared libraries before being
417 installed themselves. However, the versions left in the build directory still
418 use the uninstalled libraries.
419
420 To build PCRE using static libraries only you must use --disable-shared when
421 configuring it. For example:
422
423 ./configure --prefix=/usr/gnu --disable-shared
424
425 Then run "make" in the usual way. Similarly, you can use --disable-static to
426 build only shared libraries.
427
428
429 Cross-compiling on Unix-like systems
430 ------------------------------------
431
432 You can specify CC and CFLAGS in the normal way to the "configure" command, in
433 order to cross-compile PCRE for some other host. However, you should NOT
434 specify --enable-rebuild-chartables, because if you do, the dftables.c source
435 file is compiled and run on the local host, in order to generate the inbuilt
436 character tables (the pcre_chartables.c file). This will probably not work,
437 because dftables.c needs to be compiled with the local compiler, not the cross
438 compiler.
439
440 When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
441 by making a copy of pcre_chartables.c.dist, which is a default set of tables
442 that assumes ASCII code. Cross-compiling with the default tables should not be
443 a problem.
444
445 If you need to modify the character tables when cross-compiling, you should
446 move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
447 run it on the local host to make a new version of pcre_chartables.c.dist.
448 Then when you cross-compile PCRE this new version of the tables will be used.
449
450
451 Using HP's ANSI C++ compiler (aCC)
452 ----------------------------------
453
454 Unless C++ support is disabled by specifying the "--disable-cpp" option of the
455 "configure" script, you must include the "-AA" option in the CXXFLAGS
456 environment variable in order for the C++ components to compile correctly.
457
458 Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
459 needed libraries fail to get included when specifying the "-AA" compiler
460 option. If you experience unresolved symbols when linking the C++ programs,
461 use the workaround of specifying the following environment variable prior to
462 running the "configure" script:
463
464 CXXLDFLAGS="-lstd_v2 -lCsup_v2"
465
466
467 Making new tarballs
468 -------------------
469
470 The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
471 zip formats. The command "make distcheck" does the same, but then does a trial
472 build of the new distribution to ensure that it works.
473
474 If you have modified any of the man page sources in the doc directory, you
475 should first run the PrepareRelease script before making a distribution. This
476 script creates the .txt and HTML forms of the documentation from the man pages.
477
478
479 Testing PCRE
480 ------------
481
482 To test the basic PCRE library on a Unix system, run the RunTest script that is
483 created by the configuring process. There is also a script called RunGrepTest
484 that tests the options of the pcregrep command. If the C++ wrapper library is
485 built, three test programs called pcrecpp_unittest, pcre_scanner_unittest, and
486 pcre_stringpiece_unittest are also built.
487
488 Both the scripts and all the program tests are run if you obey "make check" or
489 "make test". For other systems, see the instructions in NON-UNIX-USE.
490
491 The RunTest script runs the pcretest test program (which is documented in its
492 own man page) on each of the testinput files in the testdata directory in
493 turn, and compares the output with the contents of the corresponding testoutput
494 files. A file called testtry is used to hold the main output from pcretest
495 (testsavedregex is also used as a working file). To run pcretest on just one of
496 the test files, give its number as an argument to RunTest, for example:
497
498 RunTest 2
499
500 The first test file can also be fed directly into the perltest.pl script to
501 check that Perl gives the same results. The only difference you should see is
502 in the first few lines, where the Perl version is given instead of the PCRE
503 version.
504
505 The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),
506 pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
507 detection, and run-time flags that are specific to PCRE, as well as the POSIX
508 wrapper API. It also uses the debugging flags to check some of the internals of
509 pcre_compile().
510
511 If you build PCRE with a locale setting that is not the standard C locale, the
512 character tables may be different (see next paragraph). In some cases, this may
513 cause failures in the second set of tests. For example, in a locale where the
514 isprint() function yields TRUE for characters in the range 128-255, the use of
515 [:isascii:] inside a character class defines a different set of characters, and
516 this shows up in this test as a difference in the compiled code, which is being
517 listed for checking. Where the comparison test output contains [\x00-\x7f] the
518 test will contain [\x00-\xff], and similarly in some other cases. This is not a
519 bug in PCRE.
520
521 The third set of tests checks pcre_maketables(), the facility for building a
522 set of character tables for a specific locale and using them instead of the
523 default tables. The tests make use of the "fr_FR" (French) locale. Before
524 running the test, the script checks for the presence of this locale by running
525 the "locale" command. If that command fails, or if it doesn't include "fr_FR"
526 in the list of available locales, the third test cannot be run, and a comment
527 is output to say why. If running this test produces instances of the error
528
529 ** Failed to set locale "fr_FR"
530
531 in the comparison output, it means that locale is not available on your system,
532 despite being listed by "locale". This does not mean that PCRE is broken.
533
534 [If you are trying to run this test on Windows, you may be able to get it to
535 work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
536 RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
537 Windows versions of test 2. More info on using RunTest.bat is included in the
538 document entitled NON-UNIX-USE.]
539
540 The fourth test checks the UTF-8 support. It is not run automatically unless
541 PCRE is built with UTF-8 support. To do this you must set --enable-utf8 when
542 running "configure". This file can be also fed directly to the perltest script,
543 provided you are running Perl 5.8 or higher. (For Perl 5.6, a small patch,
544 commented in the script, can be be used.)
545
546 The fifth test checks error handling with UTF-8 encoding, and internal UTF-8
547 features of PCRE that are not relevant to Perl.
548
549 The sixth test checks the support for Unicode character properties. It it not
550 run automatically unless PCRE is built with Unicode property support. To to
551 this you must set --enable-unicode-properties when running "configure".
552
553 The seventh, eighth, and ninth tests check the pcre_dfa_exec() alternative
554 matching function, in non-UTF-8 mode, UTF-8 mode, and UTF-8 mode with Unicode
555 property support, respectively. The eighth and ninth tests are not run
556 automatically unless PCRE is build with the relevant support.
557
558
559 Character tables
560 ----------------
561
562 For speed, PCRE uses four tables for manipulating and identifying characters
563 whose code point values are less than 256. The final argument of the
564 pcre_compile() function is a pointer to a block of memory containing the
565 concatenated tables. A call to pcre_maketables() can be used to generate a set
566 of tables in the current locale. If the final argument for pcre_compile() is
567 passed as NULL, a set of default tables that is built into the binary is used.
568
569 The source file called pcre_chartables.c contains the default set of tables. By
570 default, this is created as a copy of pcre_chartables.c.dist, which contains
571 tables for ASCII coding. However, if --enable-rebuild-chartables is specified
572 for ./configure, a different version of pcre_chartables.c is built by the
573 program dftables (compiled from dftables.c), which uses the ANSI C character
574 handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
575 build the table sources. This means that the default C locale which is set for
576 your system will control the contents of these default tables. You can change
577 the default tables by editing pcre_chartables.c and then re-building PCRE. If
578 you do this, you should take care to ensure that the file does not get
579 automatically re-generated. The best way to do this is to move
580 pcre_chartables.c.dist out of the way and replace it with your customized
581 tables.
582
583 When the dftables program is run as a result of --enable-rebuild-chartables,
584 it uses the default C locale that is set on your system. It does not pay
585 attention to the LC_xxx environment variables. In other words, it uses the
586 system's default locale rather than whatever the compiling user happens to have
587 set. If you really do want to build a source set of character tables in a
588 locale that is specified by the LC_xxx variables, you can run the dftables
589 program by hand with the -L option. For example:
590
591 ./dftables -L pcre_chartables.c.special
592
593 The first two 256-byte tables provide lower casing and case flipping functions,
594 respectively. The next table consists of three 32-byte bit maps which identify
595 digits, "word" characters, and white space, respectively. These are used when
596 building 32-byte bit maps that represent character classes for code points less
597 than 256.
598
599 The final 256-byte table has bits indicating various character types, as
600 follows:
601
602 1 white space character
603 2 letter
604 4 decimal digit
605 8 hexadecimal digit
606 16 alphanumeric or '_'
607 128 regular expression metacharacter or binary zero
608
609 You should not alter the set of characters that contain the 128 bit, as that
610 will cause PCRE to malfunction.
611
612
613 File manifest
614 -------------
615
616 The distribution should contain the following files:
617
618 (A) Source files of the PCRE library functions and their headers:
619
620 dftables.c auxiliary program for building pcre_chartables.c
621 when --enable-rebuild-chartables is specified
622
623 pcre_chartables.c.dist a default set of character tables that assume ASCII
624 coding; used, unless --enable-rebuild-chartables is
625 specified, by copying to pcre_chartables.c
626
627 pcreposix.c )
628 pcre_compile.c )
629 pcre_config.c )
630 pcre_dfa_exec.c )
631 pcre_exec.c )
632 pcre_fullinfo.c )
633 pcre_get.c ) sources for the functions in the library,
634 pcre_globals.c ) and some internal functions that they use
635 pcre_info.c )
636 pcre_maketables.c )
637 pcre_newline.c )
638 pcre_ord2utf8.c )
639 pcre_refcount.c )
640 pcre_study.c )
641 pcre_tables.c )
642 pcre_try_flipped.c )
643 pcre_ucp_searchfuncs.c )
644 pcre_valid_utf8.c )
645 pcre_version.c )
646 pcre_xclass.c )
647 pcre_printint.src ) debugging function that is #included in pcretest,
648 ) and can also be #included in pcre_compile()
649 pcre.h.in template for pcre.h when built by "configure"
650 pcreposix.h header for the external POSIX wrapper API
651 pcre_internal.h header for internal use
652 ucp.h ) headers concerned with
653 ucpinternal.h ) Unicode property handling
654 ucptable.h ) (this one is the data table)
655
656 config.h.in template for config.h, which is built by "configure"
657
658 pcrecpp.h public header file for the C++ wrapper
659 pcrecpparg.h.in template for another C++ header file
660 pcre_scanner.h public header file for C++ scanner functions
661 pcrecpp.cc )
662 pcre_scanner.cc ) source for the C++ wrapper library
663
664 pcre_stringpiece.h.in template for pcre_stringpiece.h, the header for the
665 C++ stringpiece functions
666 pcre_stringpiece.cc source for the C++ stringpiece functions
667
668 (B) Source files for programs that use PCRE:
669
670 pcredemo.c simple demonstration of coding calls to PCRE
671 pcregrep.c source of a grep utility that uses PCRE
672 pcretest.c comprehensive test program
673
674 (C) Auxiliary files:
675
676 132html script to turn "man" pages into HTML
677 AUTHORS information about the author of PCRE
678 ChangeLog log of changes to the code
679 CleanTxt script to clean nroff output for txt man pages
680 Detrail script to remove trailing spaces
681 HACKING some notes about the internals of PCRE
682 INSTALL generic installation instructions
683 LICENCE conditions for the use of PCRE
684 COPYING the same, using GNU's standard name
685 Makefile.in ) template for Unix Makefile, which is built by
686 ) "configure"
687 Makefile.am ) the automake input that was used to create
688 ) Makefile.in
689 NEWS important changes in this release
690 NON-UNIX-USE notes on building PCRE on non-Unix systems
691 PrepareRelease script to make preparations for "make dist"
692 README this file
693 RunTest a Unix shell script for running tests
694 RunGrepTest a Unix shell script for pcregrep tests
695 aclocal.m4 m4 macros (generated by "aclocal")
696 config.guess ) files used by libtool,
697 config.sub ) used only when building a shared library
698 configure a configuring shell script (built by autoconf)
699 configure.ac ) the autoconf input that was used to build
700 ) "configure" and config.h
701 depcomp ) script to find program dependencies, generated by
702 ) automake
703 doc/*.3 man page sources for the PCRE functions
704 doc/*.1 man page sources for pcregrep and pcretest
705 doc/index.html.src the base HTML page
706 doc/html/* HTML documentation
707 doc/pcre.txt plain text version of the man pages
708 doc/pcretest.txt plain text documentation of test program
709 doc/perltest.txt plain text documentation of Perl test program
710 install-sh a shell script for installing files
711 libpcre.pc.in template for libpcre.pc for pkg-config
712 libpcrecpp.pc.in template for libpcrecpp.pc for pkg-config
713 ltmain.sh file used to build a libtool script
714 missing ) common stub for a few missing GNU programs while
715 ) installing, generated by automake
716 mkinstalldirs script for making install directories
717 perltest.pl Perl test program
718 pcre-config.in source of script which retains PCRE information
719 pcrecpp_unittest.cc )
720 pcre_scanner_unittest.cc ) test programs for the C++ wrapper
721 pcre_stringpiece_unittest.cc )
722 testdata/testinput* test data for main library tests
723 testdata/testoutput* expected test results
724 testdata/grep* input and output for pcregrep tests
725
726 (D) Auxiliary files for cmake support
727
728 CMakeLists.txt
729 config-cmake.h.in
730
731 (E) Auxiliary files for VPASCAL
732
733 makevp.bat
734 makevp_c.txt
735 makevp_l.txt
736 pcregexp.pas
737
738 (F) Auxiliary files for building PCRE "by hand"
739
740 pcre.h.generic ) a version of the public PCRE header file
741 ) for use in non-"configure" environments
742 config.h.generic ) a version of config.h for use in non-"configure"
743 ) environments
744
745 (F) Miscellaneous
746
747 RunTest.bat a script for running tests under Windows
748
749 Philip Hazel
750 Email local part: ph10
751 Email domain: cam.ac.uk
752 Last updated: 13 April 2008

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