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Documentation and general text tidies in preparation for test release.
1 README file for PCRE (Perl-compatible regular expression library)
2 -----------------------------------------------------------------
4 The latest release of PCRE is always available in three alternative formats
5 from:
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
11 There is a mailing list for discussion about the development of PCRE at
13 pcre-dev@exim.org
15 Please read the NEWS file if you are upgrading from a previous release.
16 The contents of this README file are:
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
34 The PCRE APIs
35 -------------
37 PCRE is written in C, and it has its own API. The distribution also includes a
38 set of C++ wrapper functions (see the pcrecpp man page for details), courtesy
39 of Google Inc.
41 In addition, there is a set of C wrapper functions that are based on the POSIX
42 regular expression API (see the pcreposix man page). These end up in the
43 library called libpcreposix. Note that this just provides a POSIX calling
44 interface to PCRE; the regular expressions themselves still follow Perl syntax
45 and semantics. The POSIX API is restricted, and does not give full access to
46 all of PCRE's facilities.
48 The header file for the POSIX-style functions is called pcreposix.h. The
49 official POSIX name is regex.h, but I did not want to risk possible problems
50 with existing files of that name by distributing it that way. To use PCRE with
51 an existing program that uses the POSIX API, pcreposix.h will have to be
52 renamed or pointed at by a link.
54 If you are using the POSIX interface to PCRE and there is already a POSIX regex
55 library installed on your system, as well as worrying about the regex.h header
56 file (as mentioned above), you must also take care when linking programs to
57 ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
58 up the POSIX functions of the same name from the other library.
60 One way of avoiding this confusion is to compile PCRE with the addition of
61 -Dregcomp=PCREregcomp (and similarly for the other POSIX functions) to the
62 compiler flags (CFLAGS if you are using "configure" -- see below). This has the
63 effect of renaming the functions so that the names no longer clash. Of course,
64 you have to do the same thing for your applications, or write them using the
65 new names.
68 Documentation for PCRE
69 ----------------------
71 If you install PCRE in the normal way on a Unix-like system, you will end up
72 with a set of man pages whose names all start with "pcre". The one that is just
73 called "pcre" lists all the others. In addition to these man pages, the PCRE
74 documentation is supplied in two other forms:
76 1. There are files called doc/pcre.txt, doc/pcregrep.txt, and
77 doc/pcretest.txt in the source distribution. The first of these is a
78 concatenation of the text forms of all the section 3 man pages except
79 those that summarize individual functions. The other two are the text
80 forms of the section 1 man pages for the pcregrep and pcretest commands.
81 These text forms are provided for ease of scanning with text editors or
82 similar tools. They are installed in <prefix>/share/doc/pcre, where
83 <prefix> is the installation prefix (defaulting to /usr/local).
85 2. A set of files containing all the documentation in HTML form, hyperlinked
86 in various ways, and rooted in a file called index.html, is distributed in
87 doc/html and installed in <prefix>/share/doc/pcre/html.
89 Users of PCRE have contributed files containing the documentation for various
90 releases in CHM format. These can be found in the Contrib directory of the FTP
91 site (see next section).
94 Contributions by users of PCRE
95 ------------------------------
97 You can find contributions from PCRE users in the directory
99 ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib
101 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 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.
109 Building PCRE on non-Unix systems
110 ---------------------------------
112 For a non-Unix system, please read the comments in the file NON-UNIX-USE,
113 though if your system supports the use of "configure" and "make" you may be
114 able to build PCRE in the same way as for Unix-like systems. PCRE can also be
115 configured in many platform environments using the GUI facility provided by
116 CMake's cmake-gui command. This creates Makefiles, solution files, etc.
118 PCRE has been compiled on many different operating systems. It should be
119 straightforward to build PCRE on any system that has a Standard C compiler and
120 library, because it uses only Standard C functions.
123 Building PCRE on Unix-like systems
124 ----------------------------------
126 If you are using HP's ANSI C++ compiler (aCC), please see the special note
127 in the section entitled "Using HP's ANSI C++ compiler (aCC)" below.
129 The following instructions assume the use of the widely used "configure, make,
130 make install" process. There is also support for CMake in the PCRE
131 distribution; there are some comments about using CMake in the NON-UNIX-USE
132 file, though it can also be used in Unix-like systems.
134 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 the file INSTALL.
140 Most commonly, people build PCRE within its own distribution directory, and in
141 this case, on many systems, just running "./configure" is sufficient. However,
142 the usual methods of changing standard defaults are available. For example:
144 CFLAGS='-O2 -Wall' ./configure --prefix=/opt/local
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 instead of the default /usr/local.
150 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:
154 cd /build/pcre/pcre-xxx
155 /source/pcre/pcre-xxx/configure
157 PCRE is written in C and is normally compiled as a C library. However, it is
158 possible to build it as a C++ library, though the provided building apparatus
159 does not have any features to support this.
161 There are some optional features that can be included or omitted from the PCRE
162 library. They are also documented in the pcrebuild man page.
164 . By default, both shared and static libraries are built. You can change this
165 by adding one of these options to the "configure" command:
167 --disable-shared
168 --disable-static
170 (See also "Shared libraries on Unix-like systems" below.)
172 . 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 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.
177 . If you want to make use of the support for UTF-8 Unicode character strings in
178 PCRE, you must add --enable-utf8 to the "configure" command. Without it, the
179 code for handling UTF-8 is not included in the library. Even when included,
180 it still has to be enabled by an option at run time. When PCRE is compiled
181 with this option, its input can only either be ASCII or UTF-8, even when
182 running on EBCDIC platforms. It is not possible to use both --enable-utf8 and
183 --enable-ebcdic at the same time.
185 . If, in addition to support for UTF-8 character strings, you want to include
186 support for the \P, \p, and \X sequences that recognize Unicode character
187 properties, you must add --enable-unicode-properties to the "configure"
188 command. This adds about 30K to the size of the library (in the form of a
189 property table); only the basic two-letter properties such as Lu are
190 supported.
192 . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
193 of the preceding, or any of the Unicode newline sequences as indicating the
194 end of a line. Whatever you specify at build time is the default; the caller
195 of PCRE can change the selection at run time. The default newline indicator
196 is a single LF character (the Unix standard). You can specify the default
197 newline indicator by adding --enable-newline-is-cr or --enable-newline-is-lf
198 or --enable-newline-is-crlf or --enable-newline-is-anycrlf or
199 --enable-newline-is-any to the "configure" command, respectively.
201 If you specify --enable-newline-is-cr or --enable-newline-is-crlf, some of
202 the standard tests will fail, because the lines in the test files end with
203 LF. Even if the files are edited to change the line endings, there are likely
204 to be some failures. With --enable-newline-is-anycrlf or
205 --enable-newline-is-any, many tests should succeed, but there may be some
206 failures.
208 . By default, the sequence \R in a pattern matches any Unicode line ending
209 sequence. This is independent of the option specifying what PCRE considers to
210 be the end of a line (see above). However, the caller of PCRE can restrict \R
211 to match only CR, LF, or CRLF. You can make this the default by adding
212 --enable-bsr-anycrlf to the "configure" command (bsr = "backslash R").
214 . When called via the POSIX interface, PCRE uses malloc() to get additional
215 storage for processing capturing parentheses if there are more than 10 of
216 them in a pattern. You can increase this threshold by setting, for example,
218 --with-posix-malloc-threshold=20
220 on the "configure" command.
222 . PCRE has a counter that can be set to limit the amount of resources it uses.
223 If the limit is exceeded during a match, the match fails. The default is ten
224 million. You can change the default by setting, for example,
226 --with-match-limit=500000
228 on the "configure" command. This is just the default; individual calls to
229 pcre_exec() can supply their own value. There is more discussion on the
230 pcreapi man page.
232 . There is a separate counter that limits the depth of recursive function calls
233 during a matching process. This also has a default of ten million, which is
234 essentially "unlimited". You can change the default by setting, for example,
236 --with-match-limit-recursion=500000
238 Recursive function calls use up the runtime stack; running out of stack can
239 cause programs to crash in strange ways. There is a discussion about stack
240 sizes in the pcrestack man page.
242 . The default maximum compiled pattern size is around 64K. You can increase
243 this by adding --with-link-size=3 to the "configure" command. You can
244 increase it even more by setting --with-link-size=4, but this is unlikely
245 ever to be necessary. Increasing the internal link size will reduce
246 performance.
248 . You can build PCRE so that its internal match() function that is called from
249 pcre_exec() does not call itself recursively. Instead, it uses memory blocks
250 obtained from the heap via the special functions pcre_stack_malloc() and
251 pcre_stack_free() to save data that would otherwise be saved on the stack. To
252 build PCRE like this, use
254 --disable-stack-for-recursion
256 on the "configure" command. PCRE runs more slowly in this mode, but it may be
257 necessary in environments with limited stack sizes. This applies only to the
258 pcre_exec() function; it does not apply to pcre_dfa_exec(), which does not
259 use deeply nested recursion. There is a discussion about stack sizes in the
260 pcrestack man page.
262 . For speed, PCRE uses four tables for manipulating and identifying characters
263 whose code point values are less than 256. By default, it uses a set of
264 tables for ASCII encoding that is part of the distribution. If you specify
266 --enable-rebuild-chartables
268 a program called dftables is compiled and run in the default C locale when
269 you obey "make". It builds a source file called pcre_chartables.c. If you do
270 not specify this option, pcre_chartables.c is created as a copy of
271 pcre_chartables.c.dist. See "Character tables" below for further information.
273 . It is possible to compile PCRE for use on systems that use EBCDIC as their
274 character code (as opposed to ASCII) by specifying
276 --enable-ebcdic
278 This automatically implies --enable-rebuild-chartables (see above). However,
279 when PCRE is built this way, it always operates in EBCDIC. It cannot support
280 both EBCDIC and UTF-8.
282 . It is possible to compile pcregrep to use libz and/or libbz2, in order to
283 read .gz and .bz2 files (respectively), by specifying one or both of
285 --enable-pcregrep-libz
286 --enable-pcregrep-libbz2
288 Of course, the relevant libraries must be installed on your system.
290 . The default size of internal buffer used by pcregrep can be set by, for
291 example:
293 --with-pcregrep-bufsize=50K
295 The default value is 20K.
297 . It is possible to compile pcretest so that it links with the libreadline
298 library, by specifying
300 --enable-pcretest-libreadline
302 If this is done, when pcretest's input is from a terminal, it reads it using
303 the readline() function. This provides line-editing and history facilities.
304 Note that libreadline is GPL-licenced, so if you distribute a binary of
305 pcretest linked in this way, there may be licensing issues.
307 Setting this option causes the -lreadline option to be added to the pcretest
308 build. In many operating environments with a sytem-installed readline
309 library this is sufficient. However, in some environments (e.g. if an
310 unmodified distribution version of readline is in use), it may be necessary
311 to specify something like LIBS="-lncurses" as well. This is because, to quote
312 the readline INSTALL, "Readline uses the termcap functions, but does not link
313 with the termcap or curses library itself, allowing applications which link
314 with readline the to choose an appropriate library." If you get error
315 messages about missing functions tgetstr, tgetent, tputs, tgetflag, or tgoto,
316 this is the problem, and linking with the ncurses library should fix it.
318 The "configure" script builds the following files for the basic C library:
320 . Makefile is the makefile that builds the library
321 . config.h contains build-time configuration options for the library
322 . pcre.h is the public PCRE header file
323 . pcre-config is a script that shows the settings of "configure" options
324 . libpcre.pc is data for the pkg-config command
325 . libtool is a script that builds shared and/or static libraries
326 . RunTest is a script for running tests on the basic C library
327 . RunGrepTest is a script for running tests on the pcregrep command
329 Versions of config.h and pcre.h are distributed in the PCRE tarballs under the
330 names config.h.generic and pcre.h.generic. These are provided for those who
331 have to built PCRE without using "configure" or CMake. If you use "configure"
332 or CMake, the .generic versions are not used.
334 If a C++ compiler is found, the following files are also built:
336 . libpcrecpp.pc is data for the pkg-config command
337 . pcrecpparg.h is a header file for programs that call PCRE via the C++ wrapper
338 . pcre_stringpiece.h is the header for the C++ "stringpiece" functions
340 The "configure" script also creates config.status, which is an executable
341 script that can be run to recreate the configuration, and config.log, which
342 contains compiler output from tests that "configure" runs.
344 Once "configure" has run, you can run "make". It builds two libraries, called
345 libpcre and libpcreposix, a test program called pcretest, and the pcregrep
346 command. If a C++ compiler was found on your system, "make" also builds the C++
347 wrapper library, which is called libpcrecpp, and some test programs called
348 pcrecpp_unittest, pcre_scanner_unittest, and pcre_stringpiece_unittest.
349 Building the C++ wrapper can be disabled by adding --disable-cpp to the
350 "configure" command.
352 The command "make check" runs all the appropriate tests. Details of the PCRE
353 tests are given below in a separate section of this document.
355 You can use "make install" to install PCRE into live directories on your
356 system. The following are installed (file names are all relative to the
357 <prefix> that is set when "configure" is run):
359 Commands (bin):
360 pcretest
361 pcregrep
362 pcre-config
364 Libraries (lib):
365 libpcre
366 libpcreposix
367 libpcrecpp (if C++ support is enabled)
369 Configuration information (lib/pkgconfig):
370 libpcre.pc
371 libpcrecpp.pc (if C++ support is enabled)
373 Header files (include):
374 pcre.h
375 pcreposix.h
376 pcre_scanner.h )
377 pcre_stringpiece.h ) if C++ support is enabled
378 pcrecpp.h )
379 pcrecpparg.h )
381 Man pages (share/man/man{1,3}):
382 pcregrep.1
383 pcretest.1
384 pcre.3
385 pcre*.3 (lots more pages, all starting "pcre")
387 HTML documentation (share/doc/pcre/html):
388 index.html
389 *.html (lots more pages, hyperlinked from index.html)
391 Text file documentation (share/doc/pcre):
394 ChangeLog
396 NEWS
398 pcre.txt (a concatenation of the man(3) pages)
399 pcretest.txt the pcretest man page
400 pcregrep.txt the pcregrep man page
402 If you want to remove PCRE from your system, you can run "make uninstall".
403 This removes all the files that "make install" installed. However, it does not
404 remove any directories, because these are often shared with other programs.
407 Retrieving configuration information on Unix-like systems
408 ---------------------------------------------------------
410 Running "make install" installs the command pcre-config, which can be used to
411 recall information about the PCRE configuration and installation. For example:
413 pcre-config --version
415 prints the version number, and
417 pcre-config --libs
419 outputs information about where the library is installed. This command can be
420 included in makefiles for programs that use PCRE, saving the programmer from
421 having to remember too many details.
423 The pkg-config command is another system for saving and retrieving information
424 about installed libraries. Instead of separate commands for each library, a
425 single command is used. For example:
427 pkg-config --cflags pcre
429 The data is held in *.pc files that are installed in a directory called
430 <prefix>/lib/pkgconfig.
433 Shared libraries on Unix-like systems
434 -------------------------------------
436 The default distribution builds PCRE as shared libraries and static libraries,
437 as long as the operating system supports shared libraries. Shared library
438 support relies on the "libtool" script which is built as part of the
439 "configure" process.
441 The libtool script is used to compile and link both shared and static
442 libraries. They are placed in a subdirectory called .libs when they are newly
443 built. The programs pcretest and pcregrep are built to use these uninstalled
444 libraries (by means of wrapper scripts in the case of shared libraries). When
445 you use "make install" to install shared libraries, pcregrep and pcretest are
446 automatically re-built to use the newly installed shared libraries before being
447 installed themselves. However, the versions left in the build directory still
448 use the uninstalled libraries.
450 To build PCRE using static libraries only you must use --disable-shared when
451 configuring it. For example:
453 ./configure --prefix=/usr/gnu --disable-shared
455 Then run "make" in the usual way. Similarly, you can use --disable-static to
456 build only shared libraries.
459 Cross-compiling on Unix-like systems
460 ------------------------------------
462 You can specify CC and CFLAGS in the normal way to the "configure" command, in
463 order to cross-compile PCRE for some other host. However, you should NOT
464 specify --enable-rebuild-chartables, because if you do, the dftables.c source
465 file is compiled and run on the local host, in order to generate the inbuilt
466 character tables (the pcre_chartables.c file). This will probably not work,
467 because dftables.c needs to be compiled with the local compiler, not the cross
468 compiler.
470 When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
471 by making a copy of pcre_chartables.c.dist, which is a default set of tables
472 that assumes ASCII code. Cross-compiling with the default tables should not be
473 a problem.
475 If you need to modify the character tables when cross-compiling, you should
476 move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
477 run it on the local host to make a new version of pcre_chartables.c.dist.
478 Then when you cross-compile PCRE this new version of the tables will be used.
481 Using HP's ANSI C++ compiler (aCC)
482 ----------------------------------
484 Unless C++ support is disabled by specifying the "--disable-cpp" option of the
485 "configure" script, you must include the "-AA" option in the CXXFLAGS
486 environment variable in order for the C++ components to compile correctly.
488 Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
489 needed libraries fail to get included when specifying the "-AA" compiler
490 option. If you experience unresolved symbols when linking the C++ programs,
491 use the workaround of specifying the following environment variable prior to
492 running the "configure" script:
494 CXXLDFLAGS="-lstd_v2 -lCsup_v2"
497 Using Sun's compilers for Solaris
498 ---------------------------------
500 A user reports that the following configurations work on Solaris 9 sparcv9 and
501 Solaris 9 x86 (32-bit):
503 Solaris 9 sparcv9: ./configure --disable-cpp CC=/bin/cc CFLAGS="-m64 -g"
504 Solaris 9 x86: ./configure --disable-cpp CC=/bin/cc CFLAGS="-g"
507 Using PCRE from MySQL
508 ---------------------
510 On systems where both PCRE and MySQL are installed, it is possible to make use
511 of PCRE from within MySQL, as an alternative to the built-in pattern matching.
512 There is a web page that tells you how to do this:
514 http://www.mysqludf.org/lib_mysqludf_preg/index.php
517 Making new tarballs
518 -------------------
520 The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
521 zip formats. The command "make distcheck" does the same, but then does a trial
522 build of the new distribution to ensure that it works.
524 If you have modified any of the man page sources in the doc directory, you
525 should first run the PrepareRelease script before making a distribution. This
526 script creates the .txt and HTML forms of the documentation from the man pages.
529 Testing PCRE
530 ------------
532 To test the basic PCRE library on a Unix system, run the RunTest script that is
533 created by the configuring process. There is also a script called RunGrepTest
534 that tests the options of the pcregrep command. If the C++ wrapper library is
535 built, three test programs called pcrecpp_unittest, pcre_scanner_unittest, and
536 pcre_stringpiece_unittest are also built.
538 Both the scripts and all the program tests are run if you obey "make check" or
539 "make test". For other systems, see the instructions in NON-UNIX-USE.
541 The RunTest script runs the pcretest test program (which is documented in its
542 own man page) on each of the testinput files in the testdata directory in
543 turn, and compares the output with the contents of the corresponding testoutput
544 files. A file called testtry is used to hold the main output from pcretest
545 (testsavedregex is also used as a working file). To run pcretest on just one of
546 the test files, give its number as an argument to RunTest, for example:
548 RunTest 2
550 The first test file can also be fed directly into the perltest.pl script to
551 check that Perl gives the same results. The only difference you should see is
552 in the first few lines, where the Perl version is given instead of the PCRE
553 version.
555 The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),
556 pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
557 detection, and run-time flags that are specific to PCRE, as well as the POSIX
558 wrapper API. It also uses the debugging flags to check some of the internals of
559 pcre_compile().
561 If you build PCRE with a locale setting that is not the standard C locale, the
562 character tables may be different (see next paragraph). In some cases, this may
563 cause failures in the second set of tests. For example, in a locale where the
564 isprint() function yields TRUE for characters in the range 128-255, the use of
565 [:isascii:] inside a character class defines a different set of characters, and
566 this shows up in this test as a difference in the compiled code, which is being
567 listed for checking. Where the comparison test output contains [\x00-\x7f] the
568 test will contain [\x00-\xff], and similarly in some other cases. This is not a
569 bug in PCRE.
571 The third set of tests checks pcre_maketables(), the facility for building a
572 set of character tables for a specific locale and using them instead of the
573 default tables. The tests make use of the "fr_FR" (French) locale. Before
574 running the test, the script checks for the presence of this locale by running
575 the "locale" command. If that command fails, or if it doesn't include "fr_FR"
576 in the list of available locales, the third test cannot be run, and a comment
577 is output to say why. If running this test produces instances of the error
579 ** Failed to set locale "fr_FR"
581 in the comparison output, it means that locale is not available on your system,
582 despite being listed by "locale". This does not mean that PCRE is broken.
584 [If you are trying to run this test on Windows, you may be able to get it to
585 work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
586 RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
587 Windows versions of test 2. More info on using RunTest.bat is included in the
588 document entitled NON-UNIX-USE.]
590 The fourth test checks the UTF-8 support. It is not run automatically unless
591 PCRE is built with UTF-8 support. To do this you must set --enable-utf8 when
592 running "configure". This file can be also fed directly to the perltest.pl
593 script, provided you are running Perl 5.8 or higher.
595 The fifth test checks error handling with UTF-8 encoding, and internal UTF-8
596 features of PCRE that are not relevant to Perl.
598 The sixth test (which is Perl-5.10 compatible) checks the support for Unicode
599 character properties. It it not run automatically unless PCRE is built with
600 Unicode property support. To to this you must set --enable-unicode-properties
601 when running "configure".
603 The seventh, eighth, and ninth tests check the pcre_dfa_exec() alternative
604 matching function, in non-UTF-8 mode, UTF-8 mode, and UTF-8 mode with Unicode
605 property support, respectively. The eighth and ninth tests are not run
606 automatically unless PCRE is build with the relevant support.
608 The tenth test checks some internal offsets and code size features; it is run
609 only when the default "link size" of 2 is set (in other cases the sizes
610 change).
612 The eleventh test checks out features that are new in Perl 5.10, and the
613 twelfth test checks a number internals and non-Perl features concerned with
614 Unicode property support. It it not run automatically unless PCRE is built with
615 Unicode property support. To to this you must set --enable-unicode-properties
616 when running "configure".
619 Character tables
620 ----------------
622 For speed, PCRE uses four tables for manipulating and identifying characters
623 whose code point values are less than 256. The final argument of the
624 pcre_compile() function is a pointer to a block of memory containing the
625 concatenated tables. A call to pcre_maketables() can be used to generate a set
626 of tables in the current locale. If the final argument for pcre_compile() is
627 passed as NULL, a set of default tables that is built into the binary is used.
629 The source file called pcre_chartables.c contains the default set of tables. By
630 default, this is created as a copy of pcre_chartables.c.dist, which contains
631 tables for ASCII coding. However, if --enable-rebuild-chartables is specified
632 for ./configure, a different version of pcre_chartables.c is built by the
633 program dftables (compiled from dftables.c), which uses the ANSI C character
634 handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
635 build the table sources. This means that the default C locale which is set for
636 your system will control the contents of these default tables. You can change
637 the default tables by editing pcre_chartables.c and then re-building PCRE. If
638 you do this, you should take care to ensure that the file does not get
639 automatically re-generated. The best way to do this is to move
640 pcre_chartables.c.dist out of the way and replace it with your customized
641 tables.
643 When the dftables program is run as a result of --enable-rebuild-chartables,
644 it uses the default C locale that is set on your system. It does not pay
645 attention to the LC_xxx environment variables. In other words, it uses the
646 system's default locale rather than whatever the compiling user happens to have
647 set. If you really do want to build a source set of character tables in a
648 locale that is specified by the LC_xxx variables, you can run the dftables
649 program by hand with the -L option. For example:
651 ./dftables -L pcre_chartables.c.special
653 The first two 256-byte tables provide lower casing and case flipping functions,
654 respectively. The next table consists of three 32-byte bit maps which identify
655 digits, "word" characters, and white space, respectively. These are used when
656 building 32-byte bit maps that represent character classes for code points less
657 than 256.
659 The final 256-byte table has bits indicating various character types, as
660 follows:
662 1 white space character
663 2 letter
664 4 decimal digit
665 8 hexadecimal digit
666 16 alphanumeric or '_'
667 128 regular expression metacharacter or binary zero
669 You should not alter the set of characters that contain the 128 bit, as that
670 will cause PCRE to malfunction.
673 File manifest
674 -------------
676 The distribution should contain the following files:
678 (A) Source files of the PCRE library functions and their headers:
680 dftables.c auxiliary program for building pcre_chartables.c
681 when --enable-rebuild-chartables is specified
683 pcre_chartables.c.dist a default set of character tables that assume ASCII
684 coding; used, unless --enable-rebuild-chartables is
685 specified, by copying to pcre_chartables.c
687 pcreposix.c )
688 pcre_compile.c )
689 pcre_config.c )
690 pcre_dfa_exec.c )
691 pcre_exec.c )
692 pcre_fullinfo.c )
693 pcre_get.c ) sources for the functions in the library,
694 pcre_globals.c ) and some internal functions that they use
695 pcre_info.c )
696 pcre_maketables.c )
697 pcre_newline.c )
698 pcre_ord2utf8.c )
699 pcre_refcount.c )
700 pcre_study.c )
701 pcre_tables.c )
702 pcre_try_flipped.c )
703 pcre_ucd.c )
704 pcre_valid_utf8.c )
705 pcre_version.c )
706 pcre_xclass.c )
707 pcre_printint.src ) debugging function that is #included in pcretest,
708 ) and can also be #included in pcre_compile()
709 pcre.h.in template for pcre.h when built by "configure"
710 pcreposix.h header for the external POSIX wrapper API
711 pcre_internal.h header for internal use
712 ucp.h header for Unicode property handling
714 config.h.in template for config.h, which is built by "configure"
716 pcrecpp.h public header file for the C++ wrapper
717 pcrecpparg.h.in template for another C++ header file
718 pcre_scanner.h public header file for C++ scanner functions
719 pcrecpp.cc )
720 pcre_scanner.cc ) source for the C++ wrapper library
722 pcre_stringpiece.h.in template for pcre_stringpiece.h, the header for the
723 C++ stringpiece functions
724 pcre_stringpiece.cc source for the C++ stringpiece functions
726 (B) Source files for programs that use PCRE:
728 pcredemo.c simple demonstration of coding calls to PCRE
729 pcregrep.c source of a grep utility that uses PCRE
730 pcretest.c comprehensive test program
732 (C) Auxiliary files:
734 132html script to turn "man" pages into HTML
735 AUTHORS information about the author of PCRE
736 ChangeLog log of changes to the code
737 CleanTxt script to clean nroff output for txt man pages
738 Detrail script to remove trailing spaces
739 HACKING some notes about the internals of PCRE
740 INSTALL generic installation instructions
741 LICENCE conditions for the use of PCRE
742 COPYING the same, using GNU's standard name
743 Makefile.in ) template for Unix Makefile, which is built by
744 ) "configure"
745 Makefile.am ) the automake input that was used to create
746 ) Makefile.in
747 NEWS important changes in this release
748 NON-UNIX-USE notes on building PCRE on non-Unix systems
749 PrepareRelease script to make preparations for "make dist"
750 README this file
751 RunTest a Unix shell script for running tests
752 RunGrepTest a Unix shell script for pcregrep tests
753 aclocal.m4 m4 macros (generated by "aclocal")
754 config.guess ) files used by libtool,
755 config.sub ) used only when building a shared library
756 configure a configuring shell script (built by autoconf)
757 configure.ac ) the autoconf input that was used to build
758 ) "configure" and config.h
759 depcomp ) script to find program dependencies, generated by
760 ) automake
761 doc/*.3 man page sources for PCRE
762 doc/*.1 man page sources for pcregrep and pcretest
763 doc/index.html.src the base HTML page
764 doc/html/* HTML documentation
765 doc/pcre.txt plain text version of the man pages
766 doc/pcretest.txt plain text documentation of test program
767 doc/perltest.txt plain text documentation of Perl test program
768 install-sh a shell script for installing files
769 libpcre.pc.in template for libpcre.pc for pkg-config
770 libpcreposix.pc.in template for libpcreposix.pc for pkg-config
771 libpcrecpp.pc.in template for libpcrecpp.pc for pkg-config
772 ltmain.sh file used to build a libtool script
773 missing ) common stub for a few missing GNU programs while
774 ) installing, generated by automake
775 mkinstalldirs script for making install directories
776 perltest.pl Perl test program
777 pcre-config.in source of script which retains PCRE information
778 pcrecpp_unittest.cc )
779 pcre_scanner_unittest.cc ) test programs for the C++ wrapper
780 pcre_stringpiece_unittest.cc )
781 testdata/testinput* test data for main library tests
782 testdata/testoutput* expected test results
783 testdata/grep* input and output for pcregrep tests
785 (D) Auxiliary files for cmake support
788 cmake/FindPackageHandleStandardArgs.cmake
789 cmake/FindReadline.cmake
790 CMakeLists.txt
791 config-cmake.h.in
793 (E) Auxiliary files for VPASCAL
795 makevp.bat
796 makevp_c.txt
797 makevp_l.txt
798 pcregexp.pas
800 (F) Auxiliary files for building PCRE "by hand"
802 pcre.h.generic ) a version of the public PCRE header file
803 ) for use in non-"configure" environments
804 config.h.generic ) a version of config.h for use in non-"configure"
805 ) environments
807 (F) Miscellaneous
809 RunTest.bat a script for running tests under Windows
811 Philip Hazel
812 Email local part: ph10
813 Email domain: cam.ac.uk
814 Last updated: 02 August 2011


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