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1 nigel 41 README file for PCRE (Perl-compatible regular expression library)
2     -----------------------------------------------------------------
3 nigel 3
4 nigel 43 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 ph10 123
8 ph10 111 There is a mailing list for discussion about the development of PCRE at
9 nigel 43
10 ph10 123 pcre-dev@exim.org
11    
12 nigel 41 Please read the NEWS file if you are upgrading from a previous release.
13 ph10 109 The contents of this README file are:
14 nigel 23
15 ph10 109 The PCRE APIs
16     Documentation for PCRE
17     Contributions by users of PCRE
18     Building PCRE on non-Unix systems
19 ph10 122 Building PCRE on Unix-like systems
20     Retrieving configuration information on Unix-like systems
21 ph10 109 Shared libraries on Unix-like systems
22 ph10 122 Cross-compiling on Unix-like systems
23 ph10 109 Using HP's ANSI C++ compiler (aCC)
24 ph10 111 Making new tarballs
25 ph10 109 Testing PCRE
26     Character tables
27     File manifest
28 nigel 35
29 ph10 109
30 nigel 77 The PCRE APIs
31     -------------
32    
33 ph10 128 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 nigel 77
37 ph10 128 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 nigel 77
44 ph10 109 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 nigel 73 If you are using the POSIX interface to PCRE and there is already a POSIX regex
51 ph10 109 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 nigel 73 ensure that they link with PCRE's libpcreposix library. Otherwise they may pick
54 ph10 109 up the POSIX functions of the same name from the other library.
55 nigel 49
56 ph10 109 One way of avoiding this confusion is to compile PCRE with the addition of
57 ph10 122 -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 nigel 73
63 ph10 109
64 nigel 75 Documentation for PCRE
65     ----------------------
66    
67 ph10 122 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 nigel 75
72 ph10 109 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 ph10 123 similar tools. They are installed in <prefix>/share/doc/pcre, where
79 ph10 111 <prefix> is the installation prefix (defaulting to /usr/local).
80 nigel 75
81 ph10 109 2. A set of files containing all the documentation in HTML form, hyperlinked
82 ph10 123 in various ways, and rooted in a file called index.html, is distributed in
83 ph10 122 doc/html and installed in <prefix>/share/doc/pcre/html.
84 nigel 75
85    
86 nigel 53 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 ph10 122 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 ph10 128 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 nigel 53
100    
101 ph10 109 Building PCRE on non-Unix systems
102     ---------------------------------
103 ph10 101
104 ph10 122 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 ph10 260 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 ph10 101
110 ph10 109 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 ph10 101
114    
115 ph10 122 Building PCRE on Unix-like systems
116     ----------------------------------
117 nigel 3
118 nigel 87 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 ph10 145 The following instructions assume the use of the widely used "configure, make,
122     make install" process. There is also some experimental support for "cmake" in
123     the PCRE distribution, but it is incomplete and not documented. However, if you
124 ph10 144 are a "cmake" user, you might want to try it.
125    
126 nigel 63 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 ph10 122 the file INSTALL.
131 nigel 3
132 nigel 53 Most commonly, people build PCRE within its own distribution directory, and in
133 ph10 109 this case, on many systems, just running "./configure" is sufficient. However,
134     the usual methods of changing standard defaults are available. For example:
135 nigel 53
136 nigel 41 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 nigel 49 instead of the default /usr/local.
141 nigel 41
142 nigel 53 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 nigel 87 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 nigel 63 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 nigel 49
156 nigel 83 . 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 ph10 128 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 nigel 83
161 nigel 63 . 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 nigel 75 . 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 nigel 91 command. This adds about 30K to the size of the library (in the form of a
170 nigel 75 property table); only the basic two-letter properties such as Lu are
171     supported.
172    
173 nigel 93 . You can build PCRE to recognize either CR or LF or the sequence CRLF or any
174 ph10 149 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 ph10 109
182 ph10 149 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 ph10 254
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 ph10 251 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 nigel 63
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 ph10 128 them in a pattern. You can increase this threshold by setting, for example,
198 nigel 63
199     --with-posix-malloc-threshold=20
200    
201     on the "configure" command.
202    
203 nigel 77 . PCRE has a counter that can be set to limit the amount of resources it uses.
204 nigel 63 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 ph10 122 pcre_exec() can supply their own value. There is more discussion on the
211     pcreapi man page.
212 nigel 63
213 nigel 91 . 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 nigel 63 . 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 ph10 128 ever to be necessary. Increasing the internal link size will reduce
227     performance.
228 nigel 63
229 nigel 77 . You can build PCRE so that its internal match() function that is called from
230 ph10 122 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 nigel 73
235     --disable-stack-for-recursion
236    
237     on the "configure" command. PCRE runs more slowly in this mode, but it may be
238 nigel 77 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 ph10 122 use deeply nested recursion. There is a discussion about stack sizes in the
241     pcrestack man page.
242 nigel 73
243 ph10 128 . 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 ph10 286 . It is possible to compile pcregrep to use libz and/or libbz2 to read .gz
262     and .bz2 files (respectively) by specifying one or both of
263    
264     --enable-pcregrep-libz
265     --enable-pcregrep-libbz2
266    
267 ph10 109 The "configure" script builds the following files for the basic C library:
268 nigel 49
269 nigel 77 . Makefile is the makefile that builds the library
270     . config.h contains build-time configuration options for the library
271 ph10 109 . pcre.h is the public PCRE header file
272 nigel 77 . pcre-config is a script that shows the settings of "configure" options
273     . libpcre.pc is data for the pkg-config command
274 nigel 75 . libtool is a script that builds shared and/or static libraries
275 ph10 109 . RunTest is a script for running tests on the basic C library
276 nigel 77 . RunGrepTest is a script for running tests on the pcregrep command
277 nigel 41
278 ph10 123 Versions of config.h and pcre.h are distributed in the PCRE tarballs under
279 ph10 122 the names config.h.generic and pcre.h.generic. These are provided for the
280     benefit of those who have to built PCRE without the benefit of "configure". If
281     you use "configure", the .generic versions are not used.
282 nigel 77
283 ph10 109 If a C++ compiler is found, the following files are also built:
284    
285     . libpcrecpp.pc is data for the pkg-config command
286     . pcrecpparg.h is a header file for programs that call PCRE via the C++ wrapper
287 nigel 77 . pcre_stringpiece.h is the header for the C++ "stringpiece" functions
288    
289     The "configure" script also creates config.status, which is an executable
290     script that can be run to recreate the configuration, and config.log, which
291     contains compiler output from tests that "configure" runs.
292    
293     Once "configure" has run, you can run "make". It builds two libraries, called
294 ph10 109 libpcre and libpcreposix, a test program called pcretest, a demonstration
295     program called pcredemo, and the pcregrep command. If a C++ compiler was found
296 ph10 122 on your system, "make" also builds the C++ wrapper library, which is called
297 ph10 109 libpcrecpp, and some test programs called pcrecpp_unittest,
298 ph10 122 pcre_scanner_unittest, and pcre_stringpiece_unittest. Building the C++ wrapper
299     can be disabled by adding --disable-cpp to the "configure" command.
300 nigel 3
301 ph10 109 The command "make check" runs all the appropriate tests. Details of the PCRE
302     tests are given below in a separate section of this document.
303 nigel 75
304 ph10 109 You can use "make install" to install PCRE into live directories on your
305     system. The following are installed (file names are all relative to the
306     <prefix> that is set when "configure" is run):
307 nigel 77
308 ph10 109 Commands (bin):
309     pcretest
310     pcregrep
311 ph10 111 pcre-config
312 ph10 109
313     Libraries (lib):
314     libpcre
315     libpcreposix
316     libpcrecpp (if C++ support is enabled)
317    
318     Configuration information (lib/pkgconfig):
319     libpcre.pc
320 ph10 122 libpcrecpp.pc (if C++ support is enabled)
321 ph10 109
322     Header files (include):
323     pcre.h
324     pcreposix.h
325     pcre_scanner.h )
326     pcre_stringpiece.h ) if C++ support is enabled
327     pcrecpp.h )
328     pcrecpparg.h )
329    
330     Man pages (share/man/man{1,3}):
331     pcregrep.1
332     pcretest.1
333     pcre.3
334     pcre*.3 (lots more pages, all starting "pcre")
335    
336     HTML documentation (share/doc/pcre/html):
337     index.html
338     *.html (lots more pages, hyperlinked from index.html)
339    
340     Text file documentation (share/doc/pcre):
341     AUTHORS
342     COPYING
343     ChangeLog
344     LICENCE
345     NEWS
346     README
347     pcre.txt (a concatenation of the man(3) pages)
348     pcretest.txt the pcretest man page
349     pcregrep.txt the pcregrep man page
350    
351 ph10 111 Note that the pcredemo program that is built by "configure" is *not* installed
352 ph10 109 anywhere. It is a demonstration for programmers wanting to use PCRE.
353    
354 nigel 77 If you want to remove PCRE from your system, you can run "make uninstall".
355     This removes all the files that "make install" installed. However, it does not
356     remove any directories, because these are often shared with other programs.
357    
358    
359 ph10 122 Retrieving configuration information on Unix-like systems
360     ---------------------------------------------------------
361 nigel 75
362 ph10 109 Running "make install" installs the command pcre-config, which can be used to
363     recall information about the PCRE configuration and installation. For example:
364 nigel 37
365 nigel 43 pcre-config --version
366    
367     prints the version number, and
368    
369 nigel 75 pcre-config --libs
370 nigel 43
371     outputs information about where the library is installed. This command can be
372     included in makefiles for programs that use PCRE, saving the programmer from
373     having to remember too many details.
374    
375 nigel 75 The pkg-config command is another system for saving and retrieving information
376     about installed libraries. Instead of separate commands for each library, a
377     single command is used. For example:
378 nigel 43
379 nigel 75 pkg-config --cflags pcre
380    
381     The data is held in *.pc files that are installed in a directory called
382 ph10 109 <prefix>/lib/pkgconfig.
383 nigel 75
384    
385 nigel 63 Shared libraries on Unix-like systems
386     -------------------------------------
387 nigel 53
388 nigel 77 The default distribution builds PCRE as shared libraries and static libraries,
389     as long as the operating system supports shared libraries. Shared library
390     support relies on the "libtool" script which is built as part of the
391 nigel 53 "configure" process.
392 nigel 39
393 nigel 53 The libtool script is used to compile and link both shared and static
394     libraries. They are placed in a subdirectory called .libs when they are newly
395     built. The programs pcretest and pcregrep are built to use these uninstalled
396     libraries (by means of wrapper scripts in the case of shared libraries). When
397     you use "make install" to install shared libraries, pcregrep and pcretest are
398     automatically re-built to use the newly installed shared libraries before being
399 ph10 122 installed themselves. However, the versions left in the build directory still
400 nigel 53 use the uninstalled libraries.
401    
402     To build PCRE using static libraries only you must use --disable-shared when
403 nigel 75 configuring it. For example:
404 nigel 3
405 nigel 43 ./configure --prefix=/usr/gnu --disable-shared
406 nigel 41
407 nigel 53 Then run "make" in the usual way. Similarly, you can use --disable-static to
408     build only shared libraries.
409 nigel 41
410 nigel 43
411 ph10 122 Cross-compiling on Unix-like systems
412     ------------------------------------
413 nigel 63
414     You can specify CC and CFLAGS in the normal way to the "configure" command, in
415 ph10 128 order to cross-compile PCRE for some other host. However, you should NOT
416     specify --enable-rebuild-chartables, because if you do, the dftables.c source
417     file is compiled and run on the local host, in order to generate the inbuilt
418     character tables (the pcre_chartables.c file). This will probably not work,
419     because dftables.c needs to be compiled with the local compiler, not the cross
420     compiler.
421 nigel 63
422 ph10 128 When --enable-rebuild-chartables is not specified, pcre_chartables.c is created
423     by making a copy of pcre_chartables.c.dist, which is a default set of tables
424     that assumes ASCII code. Cross-compiling with the default tables should not be
425     a problem.
426 nigel 63
427 ph10 128 If you need to modify the character tables when cross-compiling, you should
428     move pcre_chartables.c.dist out of the way, then compile dftables.c by hand and
429     run it on the local host to make a new version of pcre_chartables.c.dist.
430     Then when you cross-compile PCRE this new version of the tables will be used.
431    
432    
433 nigel 87 Using HP's ANSI C++ compiler (aCC)
434     ----------------------------------
435    
436 nigel 93 Unless C++ support is disabled by specifying the "--disable-cpp" option of the
437 ph10 122 "configure" script, you must include the "-AA" option in the CXXFLAGS
438 nigel 87 environment variable in order for the C++ components to compile correctly.
439    
440     Also, note that the aCC compiler on PA-RISC platforms may have a defect whereby
441     needed libraries fail to get included when specifying the "-AA" compiler
442     option. If you experience unresolved symbols when linking the C++ programs,
443     use the workaround of specifying the following environment variable prior to
444     running the "configure" script:
445    
446     CXXLDFLAGS="-lstd_v2 -lCsup_v2"
447    
448 ph10 123
449 ph10 111 Making new tarballs
450     -------------------
451 nigel 87
452 ph10 123 The command "make dist" creates three PCRE tarballs, in tar.gz, tar.bz2, and
453 ph10 155 zip formats. The command "make distcheck" does the same, but then does a trial
454     build of the new distribution to ensure that it works.
455 ph10 111
456 ph10 155 If you have modified any of the man page sources in the doc directory, you
457     should first run the PrepareRelease script before making a distribution. This
458     script creates the .txt and HTML forms of the documentation from the man pages.
459 ph10 111
460 ph10 155
461 nigel 41 Testing PCRE
462     ------------
463    
464 ph10 122 To test the basic PCRE library on a Unix system, run the RunTest script that is
465     created by the configuring process. There is also a script called RunGrepTest
466     that tests the options of the pcregrep command. If the C++ wrapper library is
467     built, three test programs called pcrecpp_unittest, pcre_scanner_unittest, and
468 ph10 109 pcre_stringpiece_unittest are also built.
469 nigel 41
470 ph10 109 Both the scripts and all the program tests are run if you obey "make check" or
471     "make test". For other systems, see the instructions in NON-UNIX-USE.
472 nigel 77
473     The RunTest script runs the pcretest test program (which is documented in its
474 ph10 122 own man page) on each of the testinput files in the testdata directory in
475 nigel 77 turn, and compares the output with the contents of the corresponding testoutput
476 nigel 93 files. A file called testtry is used to hold the main output from pcretest
477 nigel 75 (testsavedregex is also used as a working file). To run pcretest on just one of
478     the test files, give its number as an argument to RunTest, for example:
479 nigel 41
480 nigel 63 RunTest 2
481 nigel 3
482 ph10 109 The first test file can also be fed directly into the perltest.pl script to
483     check that Perl gives the same results. The only difference you should see is
484     in the first few lines, where the Perl version is given instead of the PCRE
485     version.
486 nigel 3
487 nigel 49 The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),
488     pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
489     detection, and run-time flags that are specific to PCRE, as well as the POSIX
490 ph10 122 wrapper API. It also uses the debugging flags to check some of the internals of
491 nigel 49 pcre_compile().
492 nigel 7
493 nigel 49 If you build PCRE with a locale setting that is not the standard C locale, the
494     character tables may be different (see next paragraph). In some cases, this may
495     cause failures in the second set of tests. For example, in a locale where the
496     isprint() function yields TRUE for characters in the range 128-255, the use of
497     [:isascii:] inside a character class defines a different set of characters, and
498     this shows up in this test as a difference in the compiled code, which is being
499     listed for checking. Where the comparison test output contains [\x00-\x7f] the
500     test will contain [\x00-\xff], and similarly in some other cases. This is not a
501     bug in PCRE.
502    
503 nigel 63 The third set of tests checks pcre_maketables(), the facility for building a
504 nigel 25 set of character tables for a specific locale and using them instead of the
505 nigel 73 default tables. The tests make use of the "fr_FR" (French) locale. Before
506     running the test, the script checks for the presence of this locale by running
507     the "locale" command. If that command fails, or if it doesn't include "fr_FR"
508     in the list of available locales, the third test cannot be run, and a comment
509     is output to say why. If running this test produces instances of the error
510 nigel 25
511 nigel 73 ** Failed to set locale "fr_FR"
512 nigel 25
513     in the comparison output, it means that locale is not available on your system,
514     despite being listed by "locale". This does not mean that PCRE is broken.
515    
516 ph10 142 [If you are trying to run this test on Windows, you may be able to get it to
517 ph10 260 work by changing "fr_FR" to "french" everywhere it occurs. Alternatively, use
518     RunTest.bat. The version of RunTest.bat included with PCRE 7.4 and above uses
519     Windows versions of test 2. More info on using RunTest.bat is included in the
520     document entitled NON-UNIX-USE.]
521 ph10 139
522 nigel 63 The fourth test checks the UTF-8 support. It is not run automatically unless
523     PCRE is built with UTF-8 support. To do this you must set --enable-utf8 when
524     running "configure". This file can be also fed directly to the perltest script,
525     provided you are running Perl 5.8 or higher. (For Perl 5.6, a small patch,
526     commented in the script, can be be used.)
527 nigel 3
528 nigel 75 The fifth test checks error handling with UTF-8 encoding, and internal UTF-8
529     features of PCRE that are not relevant to Perl.
530 nigel 3
531 ph10 122 The sixth test checks the support for Unicode character properties. It it not
532     run automatically unless PCRE is built with Unicode property support. To to
533 nigel 77 this you must set --enable-unicode-properties when running "configure".
534 nigel 63
535 nigel 77 The seventh, eighth, and ninth tests check the pcre_dfa_exec() alternative
536     matching function, in non-UTF-8 mode, UTF-8 mode, and UTF-8 mode with Unicode
537     property support, respectively. The eighth and ninth tests are not run
538     automatically unless PCRE is build with the relevant support.
539 nigel 75
540 nigel 77
541 nigel 3 Character tables
542     ----------------
543    
544 ph10 122 For speed, PCRE uses four tables for manipulating and identifying characters
545     whose code point values are less than 256. The final argument of the
546     pcre_compile() function is a pointer to a block of memory containing the
547     concatenated tables. A call to pcre_maketables() can be used to generate a set
548     of tables in the current locale. If the final argument for pcre_compile() is
549     passed as NULL, a set of default tables that is built into the binary is used.
550 nigel 3
551 ph10 128 The source file called pcre_chartables.c contains the default set of tables. By
552     default, this is created as a copy of pcre_chartables.c.dist, which contains
553     tables for ASCII coding. However, if --enable-rebuild-chartables is specified
554     for ./configure, a different version of pcre_chartables.c is built by the
555     program dftables (compiled from dftables.c), which uses the ANSI C character
556     handling functions such as isalnum(), isalpha(), isupper(), islower(), etc. to
557     build the table sources. This means that the default C locale which is set for
558     your system will control the contents of these default tables. You can change
559     the default tables by editing pcre_chartables.c and then re-building PCRE. If
560     you do this, you should take care to ensure that the file does not get
561     automatically re-generated. The best way to do this is to move
562     pcre_chartables.c.dist out of the way and replace it with your customized
563     tables.
564 nigel 3
565 ph10 128 When the dftables program is run as a result of --enable-rebuild-chartables,
566     it uses the default C locale that is set on your system. It does not pay
567     attention to the LC_xxx environment variables. In other words, it uses the
568     system's default locale rather than whatever the compiling user happens to have
569     set. If you really do want to build a source set of character tables in a
570     locale that is specified by the LC_xxx variables, you can run the dftables
571     program by hand with the -L option. For example:
572    
573     ./dftables -L pcre_chartables.c.special
574    
575 nigel 25 The first two 256-byte tables provide lower casing and case flipping functions,
576     respectively. The next table consists of three 32-byte bit maps which identify
577     digits, "word" characters, and white space, respectively. These are used when
578 ph10 111 building 32-byte bit maps that represent character classes for code points less
579 ph10 109 than 256.
580 nigel 25
581     The final 256-byte table has bits indicating various character types, as
582 nigel 3 follows:
583    
584     1 white space character
585     2 letter
586     4 decimal digit
587     8 hexadecimal digit
588     16 alphanumeric or '_'
589     128 regular expression metacharacter or binary zero
590    
591     You should not alter the set of characters that contain the 128 bit, as that
592     will cause PCRE to malfunction.
593    
594    
595 ph10 109 File manifest
596     -------------
597 nigel 3
598 nigel 41 The distribution should contain the following files:
599 nigel 3
600 ph10 109 (A) Source files of the PCRE library functions and their headers:
601 nigel 3
602 ph10 128 dftables.c auxiliary program for building pcre_chartables.c
603     when --enable-rebuild-chartables is specified
604 ph10 111
605 ph10 128 pcre_chartables.c.dist a default set of character tables that assume ASCII
606     coding; used, unless --enable-rebuild-chartables is
607     specified, by copying to pcre_chartables.c
608 ph10 111
609 ph10 128 pcreposix.c )
610     pcre_compile.c )
611     pcre_config.c )
612     pcre_dfa_exec.c )
613     pcre_exec.c )
614     pcre_fullinfo.c )
615     pcre_get.c ) sources for the functions in the library,
616     pcre_globals.c ) and some internal functions that they use
617     pcre_info.c )
618     pcre_maketables.c )
619     pcre_newline.c )
620     pcre_ord2utf8.c )
621     pcre_refcount.c )
622     pcre_study.c )
623     pcre_tables.c )
624     pcre_try_flipped.c )
625     pcre_ucp_searchfuncs.c )
626     pcre_valid_utf8.c )
627     pcre_version.c )
628     pcre_xclass.c )
629     pcre_printint.src ) debugging function that is #included in pcretest,
630     ) and can also be #included in pcre_compile()
631     pcre.h.in template for pcre.h when built by "configure"
632     pcreposix.h header for the external POSIX wrapper API
633     pcre_internal.h header for internal use
634     ucp.h ) headers concerned with
635     ucpinternal.h ) Unicode property handling
636     ucptable.h ) (this one is the data table)
637 ph10 111
638 ph10 128 config.h.in template for config.h, which is built by "configure"
639 ph10 111
640 ph10 128 pcrecpp.h public header file for the C++ wrapper
641     pcrecpparg.h.in template for another C++ header file
642     pcre_scanner.h public header file for C++ scanner functions
643     pcrecpp.cc )
644     pcre_scanner.cc ) source for the C++ wrapper library
645 ph10 111
646 ph10 128 pcre_stringpiece.h.in template for pcre_stringpiece.h, the header for the
647     C++ stringpiece functions
648     pcre_stringpiece.cc source for the C++ stringpiece functions
649    
650 ph10 109 (B) Source files for programs that use PCRE:
651 nigel 75
652 ph10 128 pcredemo.c simple demonstration of coding calls to PCRE
653     pcregrep.c source of a grep utility that uses PCRE
654     pcretest.c comprehensive test program
655 ph10 111
656     (C) Auxiliary files:
657    
658 ph10 128 132html script to turn "man" pages into HTML
659     AUTHORS information about the author of PCRE
660     ChangeLog log of changes to the code
661     CleanTxt script to clean nroff output for txt man pages
662     Detrail script to remove trailing spaces
663     HACKING some notes about the internals of PCRE
664     INSTALL generic installation instructions
665     LICENCE conditions for the use of PCRE
666     COPYING the same, using GNU's standard name
667     Makefile.in ) template for Unix Makefile, which is built by
668     ) "configure"
669     Makefile.am ) the automake input that was used to create
670     ) Makefile.in
671     NEWS important changes in this release
672     NON-UNIX-USE notes on building PCRE on non-Unix systems
673     PrepareRelease script to make preparations for "make dist"
674     README this file
675 ph10 138 RunTest a Unix shell script for running tests
676     RunGrepTest a Unix shell script for pcregrep tests
677 ph10 128 aclocal.m4 m4 macros (generated by "aclocal")
678     config.guess ) files used by libtool,
679     config.sub ) used only when building a shared library
680     configure a configuring shell script (built by autoconf)
681     configure.ac ) the autoconf input that was used to build
682     ) "configure" and config.h
683     depcomp ) script to find program dependencies, generated by
684     ) automake
685     doc/*.3 man page sources for the PCRE functions
686     doc/*.1 man page sources for pcregrep and pcretest
687     doc/index.html.src the base HTML page
688     doc/html/* HTML documentation
689     doc/pcre.txt plain text version of the man pages
690     doc/pcretest.txt plain text documentation of test program
691     doc/perltest.txt plain text documentation of Perl test program
692     install-sh a shell script for installing files
693     libpcre.pc.in template for libpcre.pc for pkg-config
694     libpcrecpp.pc.in template for libpcrecpp.pc for pkg-config
695     ltmain.sh file used to build a libtool script
696     missing ) common stub for a few missing GNU programs while
697     ) installing, generated by automake
698     mkinstalldirs script for making install directories
699     perltest.pl Perl test program
700     pcre-config.in source of script which retains PCRE information
701 ph10 111 pcrecpp_unittest.cc )
702     pcre_scanner_unittest.cc ) test programs for the C++ wrapper
703     pcre_stringpiece_unittest.cc )
704 ph10 128 testdata/testinput* test data for main library tests
705     testdata/testoutput* expected test results
706     testdata/grep* input and output for pcregrep tests
707 ph10 111
708 ph10 109 (D) Auxiliary files for cmake support
709 nigel 3
710 ph10 109 CMakeLists.txt
711 ph10 111 config-cmake.h.in
712 nigel 29
713 ph10 109 (E) Auxiliary files for VPASCAL
714 nigel 29
715 nigel 63 makevp.bat
716 ph10 135 makevp_c.txt
717     makevp_l.txt
718 ph10 111 pcregexp.pas
719    
720     (F) Auxiliary files for building PCRE "by hand"
721    
722 ph10 128 pcre.h.generic ) a version of the public PCRE header file
723     ) for use in non-"configure" environments
724     config.h.generic ) a version of config.h for use in non-"configure"
725     ) environments
726 ph10 111
727 ph10 109 (F) Miscellaneous
728 nigel 63
729 ph10 109 RunTest.bat a script for running tests under Windows
730    
731 nigel 77 Philip Hazel
732     Email local part: ph10
733     Email domain: cam.ac.uk
734 ph10 286 Last updated: 17 December 2007

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