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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4    Version 6.4 05-Sep-05
5    ---------------------
7     1. Change 6.0/10/(l) to pcregrep introduced a bug that caused separator lines
8        "--" to be printed when multiple files were scanned, even when none of the
9        -A, -B, or -C options were used. This is not compatible with Gnu grep, so I
10        consider it to be a bug, and have restored the previous behaviour.
12     2. A couple of code tidies to get rid of compiler warnings.
14     3. The pcretest program used to cheat by referring to symbols in the library
15        whose names begin with _pcre_. These are internal symbols that are not
16        really supposed to be visible externally, and in some environments it is
17        possible to suppress them. The cheating is now confined to including
18        certain files from the library's source, which is a bit cleaner.
20     4. Renamed pcre.in as pcre.h.in to go with pcrecpp.h.in; it also makes the
21        file's purpose clearer.
23     5. Reorganized pcre_ucp_findchar().
26    Version 6.3 15-Aug-05
27    ---------------------
29     1. The file libpcre.pc.in did not have general read permission in the tarball.
31     2. There were some problems when building without C++ support:
33        (a) If C++ support was not built, "make install" and "make test" still
34            tried to test it.
36        (b) There were problems when the value of CXX was explicitly set. Some
37            changes have been made to try to fix these, and ...
39        (c) --disable-cpp can now be used to explicitly disable C++ support.
41        (d) The use of @CPP_OBJ@ directly caused a blank line preceded by a
42            backslash in a target when C++ was disabled. This confuses some
43            versions of "make", apparently. Using an intermediate variable solves
44            this. (Same for CPP_LOBJ.)
46     3. $(LINK_FOR_BUILD) now includes $(CFLAGS_FOR_BUILD) and $(LINK)
47        (non-Windows) now includes $(CFLAGS) because these flags are sometimes
48        necessary on certain architectures.
50     4. Added a setting of -export-symbols-regex to the link command to remove
51        those symbols that are exported in the C sense, but actually are local
52        within the library, and not documented. Their names all begin with
53        "_pcre_". This is not a perfect job, because (a) we have to except some
54        symbols that pcretest ("illegally") uses, and (b) the facility isn't always
55        available (and never for static libraries). I have made a note to try to
56        find a way round (a) in the future.
59    Version 6.2 01-Aug-05
60    ---------------------
62     1. There was no test for integer overflow of quantifier values. A construction
63        such as {1111111111111111} would give undefined results. What is worse, if
64        a minimum quantifier for a parenthesized subpattern overflowed and became
65        negative, the calculation of the memory size went wrong. This could have
66        led to memory overwriting.
68     2. Building PCRE using VPATH was broken. Hopefully it is now fixed.
70     3. Added "b" to the 2nd argument of fopen() in dftables.c, for non-Unix-like
71        operating environments where this matters.
73     4. Applied Giuseppe Maxia's patch to add additional features for controlling
74        PCRE options from within the C++ wrapper.
76     5. Named capturing subpatterns were not being correctly counted when a pattern
77        was compiled. This caused two problems: (a) If there were more than 100
78        such subpatterns, the calculation of the memory needed for the whole
79        compiled pattern went wrong, leading to an overflow error. (b) Numerical
80        back references of the form \12, where the number was greater than 9, were
81        not recognized as back references, even though there were sufficient
82        previous subpatterns.
84     6. Two minor patches to pcrecpp.cc in order to allow it to compile on older
85        versions of gcc, e.g. 2.95.4.
88    Version 6.1 21-Jun-05
89    ---------------------
91     1. There was one reference to the variable "posix" in pcretest.c that was not
92        surrounded by "#if !defined NOPOSIX".
94     2. Make it possible to compile pcretest without DFA support, UTF8 support, or
95        the cross-check on the old pcre_info() function, for the benefit of the
96        cut-down version of PCRE that is currently imported into Exim.
98     3. A (silly) pattern starting with (?i)(?-i) caused an internal space
99        allocation error. I've done the easy fix, which wastes 2 bytes for sensible
100        patterns that start (?i) but I don't think that matters. The use of (?i) is
101        just an example; this all applies to the other options as well.
103     4. Since libtool seems to echo the compile commands it is issuing, the output
104        from "make" can be reduced a bit by putting "@" in front of each libtool
105        compile command.
107     5. Patch from the folks at Google for configure.in to be a bit more thorough
108        in checking for a suitable C++ installation before trying to compile the
109        C++ stuff. This should fix a reported problem when a compiler was present,
110        but no suitable headers.
112     6. The man pages all had just "PCRE" as their title. I have changed them to
113        be the relevant file name. I have also arranged that these names are
114        retained in the file doc/pcre.txt, which is a concatenation in text format
115        of all the man pages except the little individual ones for each function.
117     7. The NON-UNIX-USE file had not been updated for the different set of source
118        files that come with release 6. I also added a few comments about the C++
119        wrapper.
122    Version 6.0 07-Jun-05
123    ---------------------
125     1. Some minor internal re-organization to help with my DFA experiments.
127     2. Some missing #ifdef SUPPORT_UCP conditionals in pcretest and printint that
128        didn't matter for the library itself when fully configured, but did matter
129        when compiling without UCP support, or within Exim, where the ucp files are
130        not imported.
132     3. Refactoring of the library code to split up the various functions into
133        different source modules. The addition of the new DFA matching code (see
134        below) to a single monolithic source would have made it really too
135        unwieldy, quite apart from causing all the code to be include in a
136        statically linked application, when only some functions are used. This is
137        relevant even without the DFA addition now that patterns can be compiled in
138        one application and matched in another.
140        The downside of splitting up is that there have to be some external
141        functions and data tables that are used internally in different modules of
142        the library but which are not part of the API. These have all had their
143        names changed to start with "_pcre_" so that they are unlikely to clash
144        with other external names.
146     4. Added an alternate matching function, pcre_dfa_exec(), which matches using
147        a different (DFA) algorithm. Although it is slower than the original
148        function, it does have some advantages for certain types of matching
149        problem.
151     5. Upgrades to pcretest in order to test the features of pcre_dfa_exec(),
152        including restarting after a partial match.
154     6. A patch for pcregrep that defines INVALID_FILE_ATTRIBUTES if it is not
155        defined when compiling for Windows was sent to me. I have put it into the
156        code, though I have no means of testing or verifying it.
158     7. Added the pcre_refcount() auxiliary function.
160     8. Added the PCRE_FIRSTLINE option. This constrains an unanchored pattern to
161        match before or at the first newline in the subject string. In pcretest,
162        the /f option on a pattern can be used to set this.
164     9. A repeated \w when used in UTF-8 mode with characters greater than 256
165        would behave wrongly. This has been present in PCRE since release 4.0.
167    10. A number of changes to the pcregrep command:
169        (a) Refactored how -x works; insert ^(...)$ instead of setting
170            PCRE_ANCHORED and checking the length, in preparation for adding
171            something similar for -w.
173        (b) Added the -w (match as a word) option.
175        (c) Refactored the way lines are read and buffered so as to have more
176            than one at a time available.
178        (d) Implemented a pcregrep test script.
180        (e) Added the -M (multiline match) option. This allows patterns to match
181            over several lines of the subject. The buffering ensures that at least
182            8K, or the rest of the document (whichever is the shorter) is available
183            for matching (and similarly the previous 8K for lookbehind assertions).
185        (f) Changed the --help output so that it now says
187              -w, --word-regex(p)
189            instead of two lines, one with "regex" and the other with "regexp"
190            because that confused at least one person since the short forms are the
191            same. (This required a bit of code, as the output is generated
192            automatically from a table. It wasn't just a text change.)
194        (g) -- can be used to terminate pcregrep options if the next thing isn't an
195            option but starts with a hyphen. Could be a pattern or a path name
196            starting with a hyphen, for instance.
198        (h) "-" can be given as a file name to represent stdin.
200        (i) When file names are being printed, "(standard input)" is used for
201            the standard input, for compatibility with GNU grep. Previously
202            "<stdin>" was used.
204        (j) The option --label=xxx can be used to supply a name to be used for
205            stdin when file names are being printed. There is no short form.
207        (k) Re-factored the options decoding logic because we are going to add
208            two more options that take data. Such options can now be given in four
209            different ways, e.g. "-fname", "-f name", "--file=name", "--file name".
211        (l) Added the -A, -B, and -C options for requesting that lines of context
212            around matches be printed.
214        (m) Added the -L option to print the names of files that do not contain
215            any matching lines, that is, the complement of -l.
217        (n) The return code is 2 if any file cannot be opened, but pcregrep does
218            continue to scan other files.
220        (o) The -s option was incorrectly implemented. For compatibility with other
221            greps, it now suppresses the error message for a non-existent or non-
222            accessible file (but not the return code). There is a new option called
223            -q that suppresses the output of matching lines, which was what -s was
224            previously doing.
226        (p) Added --include and --exclude options to specify files for inclusion
227            and exclusion when recursing.
229    11. The Makefile was not using the Autoconf-supported LDFLAGS macro properly.
230        Hopefully, it now does.
232    12. Missing cast in pcre_study().
234    13. Added an "uninstall" target to the makefile.
236    14. Replaced "extern" in the function prototypes in Makefile.in with
237        "PCRE_DATA_SCOPE", which defaults to 'extern' or 'extern "C"' in the Unix
238        world, but is set differently for Windows.
240    15. Added a second compiling function called pcre_compile2(). The only
241        difference is that it has an extra argument, which is a pointer to an
242        integer error code. When there is a compile-time failure, this is set
243        non-zero, in addition to the error test pointer being set to point to an
244        error message. The new argument may be NULL if no error number is required
245        (but then you may as well call pcre_compile(), which is now just a
246        wrapper). This facility is provided because some applications need a
247        numeric error indication, but it has also enabled me to tidy up the way
248        compile-time errors are handled in the POSIX wrapper.
250    16. Added VPATH=.libs to the makefile; this should help when building with one
251        prefix path and installing with another. (Or so I'm told by someone who
252        knows more about this stuff than I do.)
254    17. Added a new option, REG_DOTALL, to the POSIX function regcomp(). This
255        passes PCRE_DOTALL to the pcre_compile() function, making the "." character
256        match everything, including newlines. This is not POSIX-compatible, but
257        somebody wanted the feature. From pcretest it can be activated by using
258        both the P and the s flags.
260    18. AC_PROG_LIBTOOL appeared twice in Makefile.in. Removed one.
262    19. libpcre.pc was being incorrectly installed as executable.
264    20. A couple of places in pcretest check for end-of-line by looking for '\n';
265        it now also looks for '\r' so that it will work unmodified on Windows.
267    21. Added Google's contributed C++ wrapper to the distribution.
269    22. Added some untidy missing memory free() calls in pcretest, to keep
270        Electric Fence happy when testing.
274    Version 5.0 13-Sep-04
275    ---------------------
277     1. Internal change: literal characters are no longer packed up into items
278        containing multiple characters in a single byte-string. Each character
279        is now matched using a separate opcode. However, there may be more than one
280        byte in the character in UTF-8 mode.
282     2. The pcre_callout_block structure has two new fields: pattern_position and
283        next_item_length. These contain the offset in the pattern to the next match
284        item, and its length, respectively.
286     3. The PCRE_AUTO_CALLOUT option for pcre_compile() requests the automatic
287        insertion of callouts before each pattern item. Added the /C option to
288        pcretest to make use of this.
290     4. On the advice of a Windows user, the lines
292          #if defined(_WIN32) || defined(WIN32)
293          _setmode( _fileno( stdout ), 0x8000 );
294          #endif  /* defined(_WIN32) || defined(WIN32) */
296        have been added to the source of pcretest. This apparently does useful
297        magic in relation to line terminators.
299     5. Changed "r" and "w" in the calls to fopen() in pcretest to "rb" and "wb"
300        for the benefit of those environments where the "b" makes a difference.
302     6. The icc compiler has the same options as gcc, but "configure" doesn't seem
303        to know about it. I have put a hack into configure.in that adds in code
304        to set GCC=yes if CC=icc. This seems to end up at a point in the
305        generated configure script that is early enough to affect the setting of
306        compiler options, which is what is needed, but I have no means of testing
307        whether it really works. (The user who reported this had patched the
308        generated configure script, which of course I cannot do.)
310        LATER: After change 22 below (new libtool files), the configure script
311        seems to know about icc (and also ecc). Therefore, I have commented out
312        this hack in configure.in.
314     7. Added support for pkg-config (2 patches were sent in).
316     8. Negated POSIX character classes that used a combination of internal tables
317        were completely broken. These were [[:^alpha:]], [[:^alnum:]], and
318        [[:^ascii]]. Typically, they would match almost any characters. The other
319        POSIX classes were not broken in this way.
321     9. Matching the pattern "\b.*?" against "ab cd", starting at offset 1, failed
322        to find the match, as PCRE was deluded into thinking that the match had to
323        start at the start point or following a newline. The same bug applied to
324        patterns with negative forward assertions or any backward assertions
325        preceding ".*" at the start, unless the pattern required a fixed first
326        character. This was a failing pattern: "(?!.bcd).*". The bug is now fixed.
328    10. In UTF-8 mode, when moving forwards in the subject after a failed match
329        starting at the last subject character, bytes beyond the end of the subject
330        string were read.
332    11. Renamed the variable "class" as "classbits" to make life easier for C++
333        users. (Previously there was a macro definition, but it apparently wasn't
334        enough.)
336    12. Added the new field "tables" to the extra data so that tables can be passed
337        in at exec time, or the internal tables can be re-selected. This allows
338        a compiled regex to be saved and re-used at a later time by a different
339        program that might have everything at different addresses.
341    13. Modified the pcre-config script so that, when run on Solaris, it shows a
342        -R library as well as a -L library.
344    14. The debugging options of pcretest (-d on the command line or D on a
345        pattern) showed incorrect output for anything following an extended class
346        that contained multibyte characters and which was followed by a quantifier.
348    15. Added optional support for general category Unicode character properties
349        via the \p, \P, and \X escapes. Unicode property support implies UTF-8
350        support. It adds about 90K to the size of the library. The meanings of the
351        inbuilt class escapes such as \d and \s have NOT been changed.
353    16. Updated pcredemo.c to include calls to free() to release the memory for the
354        compiled pattern.
356    17. The generated file chartables.c was being created in the source directory
357        instead of in the building directory. This caused the build to fail if the
358        source directory was different from the building directory, and was
359        read-only.
361    18. Added some sample Win commands from Mark Tetrode into the NON-UNIX-USE
362        file. No doubt somebody will tell me if they don't make sense... Also added
363        Dan Mooney's comments about building on OpenVMS.
365    19. Added support for partial matching via the PCRE_PARTIAL option for
366        pcre_exec() and the \P data escape in pcretest.
368    20. Extended pcretest with 3 new pattern features:
370        (i)   A pattern option of the form ">rest-of-line" causes pcretest to
371              write the compiled pattern to the file whose name is "rest-of-line".
372              This is a straight binary dump of the data, with the saved pointer to
373              the character tables forced to be NULL. The study data, if any, is
374              written too. After writing, pcretest reads a new pattern.
376        (ii)  If, instead of a pattern, "<rest-of-line" is given, pcretest reads a
377              compiled pattern from the given file. There must not be any
378              occurrences of "<" in the file name (pretty unlikely); if there are,
379              pcretest will instead treat the initial "<" as a pattern delimiter.
380              After reading in the pattern, pcretest goes on to read data lines as
381              usual.
383        (iii) The F pattern option causes pcretest to flip the bytes in the 32-bit
384              and 16-bit fields in a compiled pattern, to simulate a pattern that
385              was compiled on a host of opposite endianness.
387    21. The pcre-exec() function can now cope with patterns that were compiled on
388        hosts of opposite endianness, with this restriction:
390          As for any compiled expression that is saved and used later, the tables
391          pointer field cannot be preserved; the extra_data field in the arguments
392          to pcre_exec() should be used to pass in a tables address if a value
393          other than the default internal tables were used at compile time.
395    22. Calling pcre_exec() with a negative value of the "ovecsize" parameter is
396        now diagnosed as an error. Previously, most of the time, a negative number
397        would have been treated as zero, but if in addition "ovector" was passed as
398        NULL, a crash could occur.
400    23. Updated the files ltmain.sh, config.sub, config.guess, and aclocal.m4 with
401        new versions from the libtool 1.5 distribution (the last one is a copy of
402        a file called libtool.m4). This seems to have fixed the need to patch
403        "configure" to support Darwin 1.3 (which I used to do). However, I still
404        had to patch ltmain.sh to ensure that ${SED} is set (it isn't on my
405        workstation).
407    24. Changed the PCRE licence to be the more standard "BSD" licence.
410    Version 4.5 01-Dec-03
411    ---------------------
413     1. There has been some re-arrangement of the code for the match() function so
414        that it can be compiled in a version that does not call itself recursively.
415        Instead, it keeps those local variables that need separate instances for
416        each "recursion" in a frame on the heap, and gets/frees frames whenever it
417        needs to "recurse". Keeping track of where control must go is done by means
418        of setjmp/longjmp. The whole thing is implemented by a set of macros that
419        hide most of the details from the main code, and operates only if
420        NO_RECURSE is defined while compiling pcre.c. If PCRE is built using the
421        "configure" mechanism, "--disable-stack-for-recursion" turns on this way of
422        operating.
424        To make it easier for callers to provide specially tailored get/free
425        functions for this usage, two new functions, pcre_stack_malloc, and
426        pcre_stack_free, are used. They are always called in strict stacking order,
427        and the size of block requested is always the same.
429        The PCRE_CONFIG_STACKRECURSE info parameter can be used to find out whether
430        PCRE has been compiled to use the stack or the heap for recursion. The
431        -C option of pcretest uses this to show which version is compiled.
433        A new data escape \S, is added to pcretest; it causes the amounts of store
434        obtained and freed by both kinds of malloc/free at match time to be added
435        to the output.
437     2. Changed the locale test to use "fr_FR" instead of "fr" because that's
438        what's available on my current Linux desktop machine.
440     3. When matching a UTF-8 string, the test for a valid string at the start has
441        been extended. If start_offset is not zero, PCRE now checks that it points
442        to a byte that is the start of a UTF-8 character. If not, it returns
443        PCRE_ERROR_BADUTF8_OFFSET (-11). Note: the whole string is still checked;
444        this is necessary because there may be backward assertions in the pattern.
445        When matching the same subject several times, it may save resources to use
446        PCRE_NO_UTF8_CHECK on all but the first call if the string is long.
448     4. The code for checking the validity of UTF-8 strings has been tightened so
449        that it rejects (a) strings containing 0xfe or 0xff bytes and (b) strings
450        containing "overlong sequences".
452     5. Fixed a bug (appearing twice) that I could not find any way of exploiting!
453        I had written "if ((digitab[*p++] && chtab_digit) == 0)" where the "&&"
454        should have been "&", but it just so happened that all the cases this let
455        through by mistake were picked up later in the function.
457     6. I had used a variable called "isblank" - this is a C99 function, causing
458        some compilers to warn. To avoid this, I renamed it (as "blankclass").
460     7. Cosmetic: (a) only output another newline at the end of pcretest if it is
461        prompting; (b) run "./pcretest /dev/null" at the start of the test script
462        so the version is shown; (c) stop "make test" echoing "./RunTest".
464     8. Added patches from David Burgess to enable PCRE to run on EBCDIC systems.
466     9. The prototype for memmove() for systems that don't have it was using
467        size_t, but the inclusion of the header that defines size_t was later. I've
468        moved the #includes for the C headers earlier to avoid this.
470    10. Added some adjustments to the code to make it easier to compiler on certain
471        special systems:
473          (a) Some "const" qualifiers were missing.
474          (b) Added the macro EXPORT before all exported functions; by default this
475              is defined to be empty.
476          (c) Changed the dftables auxiliary program (that builds chartables.c) so
477              that it reads its output file name as an argument instead of writing
478              to the standard output and assuming this can be redirected.
480    11. In UTF-8 mode, if a recursive reference (e.g. (?1)) followed a character
481        class containing characters with values greater than 255, PCRE compilation
482        went into a loop.
484    12. A recursive reference to a subpattern that was within another subpattern
485        that had a minimum quantifier of zero caused PCRE to crash. For example,
486        (x(y(?2))z)? provoked this bug with a subject that got as far as the
487        recursion. If the recursively-called subpattern itself had a zero repeat,
488        that was OK.
490    13. In pcretest, the buffer for reading a data line was set at 30K, but the
491        buffer into which it was copied (for escape processing) was still set at
492        1024, so long lines caused crashes.
494    14. A pattern such as /[ab]{1,3}+/ failed to compile, giving the error
495        "internal error: code overflow...". This applied to any character class
496        that was followed by a possessive quantifier.
498    15. Modified the Makefile to add libpcre.la as a prerequisite for
499        libpcreposix.la because I was told this is needed for a parallel build to
500        work.
502    16. If a pattern that contained .* following optional items at the start was
503        studied, the wrong optimizing data was generated, leading to matching
504        errors. For example, studying /[ab]*.*c/ concluded, erroneously, that any
505        matching string must start with a or b or c. The correct conclusion for
506        this pattern is that a match can start with any character.
509    Version 4.4 13-Aug-03
510    ---------------------
512     1. In UTF-8 mode, a character class containing characters with values between
513        127 and 255 was not handled correctly if the compiled pattern was studied.
514        In fixing this, I have also improved the studying algorithm for such
515        classes (slightly).
517     2. Three internal functions had redundant arguments passed to them. Removal
518        might give a very teeny performance improvement.
520     3. Documentation bug: the value of the capture_top field in a callout is *one
521        more than* the number of the hightest numbered captured substring.
523     4. The Makefile linked pcretest and pcregrep with -lpcre, which could result
524        in incorrectly linking with a previously installed version. They now link
525        explicitly with libpcre.la.
527     5. configure.in no longer needs to recognize Cygwin specially.
529     6. A problem in pcre.in for Windows platforms is fixed.
531     7. If a pattern was successfully studied, and the -d (or /D) flag was given to
532        pcretest, it used to include the size of the study block as part of its
533        output. Unfortunately, the structure contains a field that has a different
534        size on different hardware architectures. This meant that the tests that
535        showed this size failed. As the block is currently always of a fixed size,
536        this information isn't actually particularly useful in pcretest output, so
537        I have just removed it.
539     8. Three pre-processor statements accidentally did not start in column 1.
540        Sadly, there are *still* compilers around that complain, even though
541        standard C has not required this for well over a decade. Sigh.
543     9. In pcretest, the code for checking callouts passed small integers in the
544        callout_data field, which is a void * field. However, some picky compilers
545        complained about the casts involved for this on 64-bit systems. Now
546        pcretest passes the address of the small integer instead, which should get
547        rid of the warnings.
549    10. By default, when in UTF-8 mode, PCRE now checks for valid UTF-8 strings at
550        both compile and run time, and gives an error if an invalid UTF-8 sequence
551        is found. There is a option for disabling this check in cases where the
552        string is known to be correct and/or the maximum performance is wanted.
554    11. In response to a bug report, I changed one line in Makefile.in from
556            -Wl,--out-implib,.libs/lib@WIN_PREFIX@pcreposix.dll.a \
557        to
558            -Wl,--out-implib,.libs/@WIN_PREFIX@libpcreposix.dll.a \
560        to look similar to other lines, but I have no way of telling whether this
561        is the right thing to do, as I do not use Windows. No doubt I'll get told
562        if it's wrong...
565    Version 4.3 21-May-03
566    ---------------------
568    1. Two instances of @WIN_PREFIX@ omitted from the Windows targets in the
569       Makefile.
571    2. Some refactoring to improve the quality of the code:
573       (i)   The utf8_table... variables are now declared "const".
575       (ii)  The code for \cx, which used the "case flipping" table to upper case
576             lower case letters, now just substracts 32. This is ASCII-specific,
577             but the whole concept of \cx is ASCII-specific, so it seems
578             reasonable.
580       (iii) PCRE was using its character types table to recognize decimal and
581             hexadecimal digits in the pattern. This is silly, because it handles
582             only 0-9, a-f, and A-F, but the character types table is locale-
583             specific, which means strange things might happen. A private
584             table is now used for this - though it costs 256 bytes, a table is
585             much faster than multiple explicit tests. Of course, the standard
586             character types table is still used for matching digits in subject
587             strings against \d.
589       (iv)  Strictly, the identifier ESC_t is reserved by POSIX (all identifiers
590             ending in _t are). So I've renamed it as ESC_tee.
592    3. The first argument for regexec() in the POSIX wrapper should have been
593       defined as "const".
595    4. Changed pcretest to use malloc() for its buffers so that they can be
596       Electric Fenced for debugging.
598    5. There were several places in the code where, in UTF-8 mode, PCRE would try
599       to read one or more bytes before the start of the subject string. Often this
600       had no effect on PCRE's behaviour, but in some circumstances it could
601       provoke a segmentation fault.
603    6. A lookbehind at the start of a pattern in UTF-8 mode could also cause PCRE
604       to try to read one or more bytes before the start of the subject string.
606    7. A lookbehind in a pattern matched in non-UTF-8 mode on a PCRE compiled with
607       UTF-8 support could misbehave in various ways if the subject string
608       contained bytes with the 0x80 bit set and the 0x40 bit unset in a lookbehind
609       area. (PCRE was not checking for the UTF-8 mode flag, and trying to move
610       back over UTF-8 characters.)
613    Version 4.2 14-Apr-03
614    ---------------------
616    1. Typo "#if SUPPORT_UTF8" instead of "#ifdef SUPPORT_UTF8" fixed.
618    2. Changes to the building process, supplied by Ronald Landheer-Cieslak
619         [ON_WINDOWS]: new variable, "#" on non-Windows platforms
620         [NOT_ON_WINDOWS]: new variable, "#" on Windows platforms
621         [WIN_PREFIX]: new variable, "cyg" for Cygwin
622         * Makefile.in: use autoconf substitution for OBJEXT, EXEEXT, BUILD_OBJEXT
623           and BUILD_EXEEXT
624         Note: automatic setting of the BUILD variables is not yet working
625         set CPPFLAGS and BUILD_CPPFLAGS (but don't use yet) - should be used at
626           compile-time but not at link-time
627         [LINK]: use for linking executables only
628         make different versions for Windows and non-Windows
629         [LINKLIB]: new variable, copy of UNIX-style LINK, used for linking
630           libraries
631         [LINK_FOR_BUILD]: new variable
632         [OBJEXT]: use throughout
633         [EXEEXT]: use throughout
634         <winshared>: new target
635         <wininstall>: new target
636         <dftables.o>: use native compiler
637         <dftables>: use native linker
638         <install>: handle Windows platform correctly
639         <clean>: ditto
640         <check>: ditto
641         copy DLL to top builddir before testing
643       As part of these changes, -no-undefined was removed again. This was reported
644       to give trouble on HP-UX 11.0, so getting rid of it seems like a good idea
645       in any case.
647    3. Some tidies to get rid of compiler warnings:
649       . In the match_data structure, match_limit was an unsigned long int, whereas
650         match_call_count was an int. I've made them both unsigned long ints.
652       . In pcretest the fact that a const uschar * doesn't automatically cast to
653         a void * provoked a warning.
655       . Turning on some more compiler warnings threw up some "shadow" variables
656         and a few more missing casts.
658    4. If PCRE was complied with UTF-8 support, but called without the PCRE_UTF8
659       option, a class that contained a single character with a value between 128
660       and 255 (e.g. /[\xFF]/) caused PCRE to crash.
662    5. If PCRE was compiled with UTF-8 support, but called without the PCRE_UTF8
663       option, a class that contained several characters, but with at least one
664       whose value was between 128 and 255 caused PCRE to crash.
667    Version 4.1 12-Mar-03
668    ---------------------
670    1. Compiling with gcc -pedantic found a couple of places where casts were
671    needed, and a string in dftables.c that was longer than standard compilers are
672    required to support.
674    2. Compiling with Sun's compiler found a few more places where the code could
675    be tidied up in order to avoid warnings.
677    3. The variables for cross-compiling were called HOST_CC and HOST_CFLAGS; the
678    first of these names is deprecated in the latest Autoconf in favour of the name
679    CC_FOR_BUILD, because "host" is typically used to mean the system on which the
680    compiled code will be run. I can't find a reference for HOST_CFLAGS, but by
681    analogy I have changed it to CFLAGS_FOR_BUILD.
683    4. Added -no-undefined to the linking command in the Makefile, because this is
684    apparently helpful for Windows. To make it work, also added "-L. -lpcre" to the
685    linking step for the pcreposix library.
687    5. PCRE was failing to diagnose the case of two named groups with the same
688    name.
690    6. A problem with one of PCRE's optimizations was discovered. PCRE remembers a
691    literal character that is needed in the subject for a match, and scans along to
692    ensure that it is present before embarking on the full matching process. This
693    saves time in cases of nested unlimited repeats that are never going to match.
694    Problem: the scan can take a lot of time if the subject is very long (e.g.
695    megabytes), thus penalizing straightforward matches. It is now done only if the
696    amount of subject to be scanned is less than 1000 bytes.
698    7. A lesser problem with the same optimization is that it was recording the
699    first character of an anchored pattern as "needed", thus provoking a search
700    right along the subject, even when the first match of the pattern was going to
701    fail. The "needed" character is now not set for anchored patterns, unless it
702    follows something in the pattern that is of non-fixed length. Thus, it still
703    fulfils its original purpose of finding quick non-matches in cases of nested
704    unlimited repeats, but isn't used for simple anchored patterns such as /^abc/.
707    Version 4.0 17-Feb-03
708    ---------------------
710    1. If a comment in an extended regex that started immediately after a meta-item
711    extended to the end of string, PCRE compiled incorrect data. This could lead to
712    all kinds of weird effects. Example: /#/ was bad; /()#/ was bad; /a#/ was not.
714    2. Moved to autoconf 2.53 and libtool 1.4.2.
716    3. Perl 5.8 no longer needs "use utf8" for doing UTF-8 things. Consequently,
717    the special perltest8 script is no longer needed - all the tests can be run
718    from a single perltest script.
720    4. From 5.004, Perl has not included the VT character (0x0b) in the set defined
721    by \s. It has now been removed in PCRE. This means it isn't recognized as
722    whitespace in /x regexes too, which is the same as Perl. Note that the POSIX
723    class [:space:] *does* include VT, thereby creating a mess.
725    5. Added the class [:blank:] (a GNU extension from Perl 5.8) to match only
726    space and tab.
728    6. Perl 5.005 was a long time ago. It's time to amalgamate the tests that use
729    its new features into the main test script, reducing the number of scripts.
731    7. Perl 5.8 has changed the meaning of patterns like /a(?i)b/. Earlier versions
732    were backward compatible, and made the (?i) apply to the whole pattern, as if
733    /i were given. Now it behaves more logically, and applies the option setting
734    only to what follows. PCRE has been changed to follow suit. However, if it
735    finds options settings right at the start of the pattern, it extracts them into
736    the global options, as before. Thus, they show up in the info data.
738    8. Added support for the \Q...\E escape sequence. Characters in between are
739    treated as literals. This is slightly different from Perl in that $ and @ are
740    also handled as literals inside the quotes. In Perl, they will cause variable
741    interpolation. Note the following examples:
743        Pattern            PCRE matches      Perl matches
745        \Qabc$xyz\E        abc$xyz           abc followed by the contents of $xyz
746        \Qabc\$xyz\E       abc\$xyz          abc\$xyz
747        \Qabc\E\$\Qxyz\E   abc$xyz           abc$xyz
749    For compatibility with Perl, \Q...\E sequences are recognized inside character
750    classes as well as outside them.
752    9. Re-organized 3 code statements in pcretest to avoid "overflow in
753    floating-point constant arithmetic" warnings from a Microsoft compiler. Added a
754    (size_t) cast to one statement in pcretest and one in pcreposix to avoid
755    signed/unsigned warnings.
757    10. SunOS4 doesn't have strtoul(). This was used only for unpicking the -o
758    option for pcretest, so I've replaced it by a simple function that does just
759    that job.
761    11. pcregrep was ending with code 0 instead of 2 for the commands "pcregrep" or
762    "pcregrep -".
764    12. Added "possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's
765    Java package. This provides some syntactic sugar for simple cases of what my
766    documentation calls "once-only subpatterns". A pattern such as x*+ is the same
767    as (?>x*). In other words, if what is inside (?>...) is just a single repeated
768    item, you can use this simplified notation. Note that only makes sense with
769    greedy quantifiers. Consequently, the use of the possessive quantifier forces
770    greediness, whatever the setting of the PCRE_UNGREEDY option.
772    13. A change of greediness default within a pattern was not taking effect at
773    the current level for patterns like /(b+(?U)a+)/. It did apply to parenthesized
774    subpatterns that followed. Patterns like /b+(?U)a+/ worked because the option
775    was abstracted outside.
777    14. PCRE now supports the \G assertion. It is true when the current matching
778    position is at the start point of the match. This differs from \A when the
779    starting offset is non-zero. Used with the /g option of pcretest (or similar
780    code), it works in the same way as it does for Perl's /g option. If all
781    alternatives of a regex begin with \G, the expression is anchored to the start
782    match position, and the "anchored" flag is set in the compiled expression.
784    15. Some bugs concerning the handling of certain option changes within patterns
785    have been fixed. These applied to options other than (?ims). For example,
786    "a(?x: b c )d" did not match "XabcdY" but did match "Xa b c dY". It should have
787    been the other way round. Some of this was related to change 7 above.
789    16. PCRE now gives errors for /[.x.]/ and /[=x=]/ as unsupported POSIX
790    features, as Perl does. Previously, PCRE gave the warnings only for /[[.x.]]/
791    and /[[=x=]]/. PCRE now also gives an error for /[:name:]/ because it supports
792    POSIX classes only within a class (e.g. /[[:alpha:]]/).
794    17. Added support for Perl's \C escape. This matches one byte, even in UTF8
795    mode. Unlike ".", it always matches newline, whatever the setting of
796    PCRE_DOTALL. However, PCRE does not permit \C to appear in lookbehind
797    assertions. Perl allows it, but it doesn't (in general) work because it can't
798    calculate the length of the lookbehind. At least, that's the case for Perl
799    5.8.0 - I've been told they are going to document that it doesn't work in
800    future.
802    18. Added an error diagnosis for escapes that PCRE does not support: these are
803    \L, \l, \N, \P, \p, \U, \u, and \X.
805    19. Although correctly diagnosing a missing ']' in a character class, PCRE was
806    reading past the end of the pattern in cases such as /[abcd/.
808    20. PCRE was getting more memory than necessary for patterns with classes that
809    contained both POSIX named classes and other characters, e.g. /[[:space:]abc/.
811    21. Added some code, conditional on #ifdef VPCOMPAT, to make life easier for
812    compiling PCRE for use with Virtual Pascal.
814    22. Small fix to the Makefile to make it work properly if the build is done
815    outside the source tree.
817    23. Added a new extension: a condition to go with recursion. If a conditional
818    subpattern starts with (?(R) the "true" branch is used if recursion has
819    happened, whereas the "false" branch is used only at the top level.
821    24. When there was a very long string of literal characters (over 255 bytes
822    without UTF support, over 250 bytes with UTF support), the computation of how
823    much memory was required could be incorrect, leading to segfaults or other
824    strange effects.
826    25. PCRE was incorrectly assuming anchoring (either to start of subject or to
827    start of line for a non-DOTALL pattern) when a pattern started with (.*) and
828    there was a subsequent back reference to those brackets. This meant that, for
829    example, /(.*)\d+\1/ failed to match "abc123bc". Unfortunately, it isn't
830    possible to check for precisely this case. All we can do is abandon the
831    optimization if .* occurs inside capturing brackets when there are any back
832    references whatsoever. (See below for a better fix that came later.)
834    26. The handling of the optimization for finding the first character of a
835    non-anchored pattern, and for finding a character that is required later in the
836    match were failing in some cases. This didn't break the matching; it just
837    failed to optimize when it could. The way this is done has been re-implemented.
839    27. Fixed typo in error message for invalid (?R item (it said "(?p").
841    28. Added a new feature that provides some of the functionality that Perl
842    provides with (?{...}). The facility is termed a "callout". The way it is done
843    in PCRE is for the caller to provide an optional function, by setting
844    pcre_callout to its entry point. Like pcre_malloc and pcre_free, this is a
845    global variable. By default it is unset, which disables all calling out. To get
846    the function called, the regex must include (?C) at appropriate points. This
847    is, in fact, equivalent to (?C0), and any number <= 255 may be given with (?C).
848    This provides a means of identifying different callout points. When PCRE
849    reaches such a point in the regex, if pcre_callout has been set, the external
850    function is called. It is provided with data in a structure called
851    pcre_callout_block, which is defined in pcre.h. If the function returns 0,
852    matching continues; if it returns a non-zero value, the match at the current
853    point fails. However, backtracking will occur if possible. [This was changed
854    later and other features added - see item 49 below.]
856    29. pcretest is upgraded to test the callout functionality. It provides a
857    callout function that displays information. By default, it shows the start of
858    the match and the current position in the text. There are some new data escapes
859    to vary what happens:
861        \C+         in addition, show current contents of captured substrings
862        \C-         do not supply a callout function
863        \C!n        return 1 when callout number n is reached
864        \C!n!m      return 1 when callout number n is reached for the mth time
866    30. If pcregrep was called with the -l option and just a single file name, it
867    output "<stdin>" if a match was found, instead of the file name.
869    31. Improve the efficiency of the POSIX API to PCRE. If the number of capturing
870    slots is less than POSIX_MALLOC_THRESHOLD, use a block on the stack to pass to
871    pcre_exec(). This saves a malloc/free per call. The default value of
872    POSIX_MALLOC_THRESHOLD is 10; it can be changed by --with-posix-malloc-threshold
873    when configuring.
875    32. The default maximum size of a compiled pattern is 64K. There have been a
876    few cases of people hitting this limit. The code now uses macros to handle the
877    storing of links as offsets within the compiled pattern. It defaults to 2-byte
878    links, but this can be changed to 3 or 4 bytes by --with-link-size when
879    configuring. Tests 2 and 5 work only with 2-byte links because they output
880    debugging information about compiled patterns.
882    33. Internal code re-arrangements:
884    (a) Moved the debugging function for printing out a compiled regex into
885        its own source file (printint.c) and used #include to pull it into
886        pcretest.c and, when DEBUG is defined, into pcre.c, instead of having two
887        separate copies.
889    (b) Defined the list of op-code names for debugging as a macro in
890        internal.h so that it is next to the definition of the opcodes.
892    (c) Defined a table of op-code lengths for simpler skipping along compiled
893        code. This is again a macro in internal.h so that it is next to the
894        definition of the opcodes.
896    34. Added support for recursive calls to individual subpatterns, along the
897    lines of Robin Houston's patch (but implemented somewhat differently).
899    35. Further mods to the Makefile to help Win32. Also, added code to pcregrep to
900    allow it to read and process whole directories in Win32. This code was
901    contributed by Lionel Fourquaux; it has not been tested by me.
903    36. Added support for named subpatterns. The Python syntax (?P<name>...) is
904    used to name a group. Names consist of alphanumerics and underscores, and must
905    be unique. Back references use the syntax (?P=name) and recursive calls use
906    (?P>name) which is a PCRE extension to the Python extension. Groups still have
907    numbers. The function pcre_fullinfo() can be used after compilation to extract
908    a name/number map. There are three relevant calls:
910      PCRE_INFO_NAMEENTRYSIZE        yields the size of each entry in the map
911      PCRE_INFO_NAMECOUNT            yields the number of entries
912      PCRE_INFO_NAMETABLE            yields a pointer to the map.
914    The map is a vector of fixed-size entries. The size of each entry depends on
915    the length of the longest name used. The first two bytes of each entry are the
916    group number, most significant byte first. There follows the corresponding
917    name, zero terminated. The names are in alphabetical order.
919    37. Make the maximum literal string in the compiled code 250 for the non-UTF-8
920    case instead of 255. Making it the same both with and without UTF-8 support
921    means that the same test output works with both.
923    38. There was a case of malloc(0) in the POSIX testing code in pcretest. Avoid
924    calling malloc() with a zero argument.
926    39. Change 25 above had to resort to a heavy-handed test for the .* anchoring
927    optimization. I've improved things by keeping a bitmap of backreferences with
928    numbers 1-31 so that if .* occurs inside capturing brackets that are not in
929    fact referenced, the optimization can be applied. It is unlikely that a
930    relevant occurrence of .* (i.e. one which might indicate anchoring or forcing
931    the match to follow \n) will appear inside brackets with a number greater than
932    31, but if it does, any back reference > 31 suppresses the optimization.
934    40. Added a new compile-time option PCRE_NO_AUTO_CAPTURE. This has the effect
935    of disabling numbered capturing parentheses. Any opening parenthesis that is
936    not followed by ? behaves as if it were followed by ?: but named parentheses
937    can still be used for capturing (and they will acquire numbers in the usual
938    way).
940    41. Redesigned the return codes from the match() function into yes/no/error so
941    that errors can be passed back from deep inside the nested calls. A malloc
942    failure while inside a recursive subpattern call now causes the
943    PCRE_ERROR_NOMEMORY return instead of quietly going wrong.
945    42. It is now possible to set a limit on the number of times the match()
946    function is called in a call to pcre_exec(). This facility makes it possible to
947    limit the amount of recursion and backtracking, though not in a directly
948    obvious way, because the match() function is used in a number of different
949    circumstances. The count starts from zero for each position in the subject
950    string (for non-anchored patterns). The default limit is, for compatibility, a
951    large number, namely 10 000 000. You can change this in two ways:
953    (a) When configuring PCRE before making, you can use --with-match-limit=n
954        to set a default value for the compiled library.
956    (b) For each call to pcre_exec(), you can pass a pcre_extra block in which
957        a different value is set. See 45 below.
959    If the limit is exceeded, pcre_exec() returns PCRE_ERROR_MATCHLIMIT.
961    43. Added a new function pcre_config(int, void *) to enable run-time extraction
962    of things that can be changed at compile time. The first argument specifies
963    what is wanted and the second points to where the information is to be placed.
964    The current list of available information is:
968    The output is an integer that is set to one if UTF-8 support is available;
969    otherwise it is set to zero.
973    The output is an integer that it set to the value of the code that is used for
974    newline. It is either LF (10) or CR (13).
978    The output is an integer that contains the number of bytes used for internal
979    linkage in compiled expressions. The value is 2, 3, or 4. See item 32 above.
983    The output is an integer that contains the threshold above which the POSIX
984    interface uses malloc() for output vectors. See item 31 above.
988    The output is an unsigned integer that contains the default limit of the number
989    of match() calls in a pcre_exec() execution. See 42 above.
991    44. pcretest has been upgraded by the addition of the -C option. This causes it
992    to extract all the available output from the new pcre_config() function, and to
993    output it. The program then exits immediately.
995    45. A need has arisen to pass over additional data with calls to pcre_exec() in
996    order to support additional features. One way would have been to define
997    pcre_exec2() (for example) with extra arguments, but this would not have been
998    extensible, and would also have required all calls to the original function to
999    be mapped to the new one. Instead, I have chosen to extend the mechanism that
1000    is used for passing in "extra" data from pcre_study().
1002    The pcre_extra structure is now exposed and defined in pcre.h. It currently
1003    contains the following fields:
1005      flags         a bitmap indicating which of the following fields are set
1006      study_data    opaque data from pcre_study()
1007      match_limit   a way of specifying a limit on match() calls for a specific
1008                      call to pcre_exec()
1009      callout_data  data for callouts (see 49 below)
1011    The flag bits are also defined in pcre.h, and are
1017    The pcre_study() function now returns one of these new pcre_extra blocks, with
1018    the actual study data pointed to by the study_data field, and the
1019    PCRE_EXTRA_STUDY_DATA flag set. This can be passed directly to pcre_exec() as
1020    before. That is, this change is entirely upwards-compatible and requires no
1021    change to existing code.
1023    If you want to pass in additional data to pcre_exec(), you can either place it
1024    in a pcre_extra block provided by pcre_study(), or create your own pcre_extra
1025    block.
1027    46. pcretest has been extended to test the PCRE_EXTRA_MATCH_LIMIT feature. If a
1028    data string contains the escape sequence \M, pcretest calls pcre_exec() several
1029    times with different match limits, until it finds the minimum value needed for
1030    pcre_exec() to complete. The value is then output. This can be instructive; for
1031    most simple matches the number is quite small, but for pathological cases it
1032    gets very large very quickly.
1034    47. There's a new option for pcre_fullinfo() called PCRE_INFO_STUDYSIZE. It
1035    returns the size of the data block pointed to by the study_data field in a
1036    pcre_extra block, that is, the value that was passed as the argument to
1037    pcre_malloc() when PCRE was getting memory in which to place the information
1038    created by pcre_study(). The fourth argument should point to a size_t variable.
1039    pcretest has been extended so that this information is shown after a successful
1040    pcre_study() call when information about the compiled regex is being displayed.
1042    48. Cosmetic change to Makefile: there's no need to have / after $(DESTDIR)
1043    because what follows is always an absolute path. (Later: it turns out that this
1044    is more than cosmetic for MinGW, because it doesn't like empty path
1045    components.)
1047    49. Some changes have been made to the callout feature (see 28 above):
1049    (i)  A callout function now has three choices for what it returns:
1051           0  =>  success, carry on matching
1052         > 0  =>  failure at this point, but backtrack if possible
1053         < 0  =>  serious error, return this value from pcre_exec()
1055         Negative values should normally be chosen from the set of PCRE_ERROR_xxx
1056         values. In particular, returning PCRE_ERROR_NOMATCH forces a standard
1057         "match failed" error. The error number PCRE_ERROR_CALLOUT is reserved for
1058         use by callout functions. It will never be used by PCRE itself.
1060    (ii) The pcre_extra structure (see 45 above) has a void * field called
1061         callout_data, with corresponding flag bit PCRE_EXTRA_CALLOUT_DATA. The
1062         pcre_callout_block structure has a field of the same name. The contents of
1063         the field passed in the pcre_extra structure are passed to the callout
1064         function in the corresponding field in the callout block. This makes it
1065         easier to use the same callout-containing regex from multiple threads. For
1066         testing, the pcretest program has a new data escape
1068           \C*n        pass the number n (may be negative) as callout_data
1070         If the callout function in pcretest receives a non-zero value as
1071         callout_data, it returns that value.
1073    50. Makefile wasn't handling CFLAGS properly when compiling dftables. Also,
1074    there were some redundant $(CFLAGS) in commands that are now specified as
1075    $(LINK), which already includes $(CFLAGS).
1077    51. Extensions to UTF-8 support are listed below. These all apply when (a) PCRE
1078    has been compiled with UTF-8 support *and* pcre_compile() has been compiled
1079    with the PCRE_UTF8 flag. Patterns that are compiled without that flag assume
1080    one-byte characters throughout. Note that case-insensitive matching applies
1081    only to characters whose values are less than 256. PCRE doesn't support the
1082    notion of cases for higher-valued characters.
1084    (i)   A character class whose characters are all within 0-255 is handled as
1085          a bit map, and the map is inverted for negative classes. Previously, a
1086          character > 255 always failed to match such a class; however it should
1087          match if the class was a negative one (e.g. [^ab]). This has been fixed.
1089    (ii)  A negated character class with a single character < 255 is coded as
1090          "not this character" (OP_NOT). This wasn't working properly when the test
1091          character was multibyte, either singly or repeated.
1093    (iii) Repeats of multibyte characters are now handled correctly in UTF-8
1094          mode, for example: \x{100}{2,3}.
1096    (iv)  The character escapes \b, \B, \d, \D, \s, \S, \w, and \W (either
1097          singly or repeated) now correctly test multibyte characters. However,
1098          PCRE doesn't recognize any characters with values greater than 255 as
1099          digits, spaces, or word characters. Such characters always match \D, \S,
1100          and \W, and never match \d, \s, or \w.
1102    (v)   Classes may now contain characters and character ranges with values
1103          greater than 255. For example: [ab\x{100}-\x{400}].
1105    (vi)  pcregrep now has a --utf-8 option (synonym -u) which makes it call
1106          PCRE in UTF-8 mode.
1108    52. The info request value PCRE_INFO_FIRSTCHAR has been renamed
1109    PCRE_INFO_FIRSTBYTE because it is a byte value. However, the old name is
1110    retained for backwards compatibility. (Note that LASTLITERAL is also a byte
1111    value.)
1113    53. The single man page has become too large. I have therefore split it up into
1114    a number of separate man pages. These also give rise to individual HTML pages;
1115    these are now put in a separate directory, and there is an index.html page that
1116    lists them all. Some hyperlinking between the pages has been installed.
1118    54. Added convenience functions for handling named capturing parentheses.
1120    55. Unknown escapes inside character classes (e.g. [\M]) and escapes that
1121    aren't interpreted therein (e.g. [\C]) are literals in Perl. This is now also
1122    true in PCRE, except when the PCRE_EXTENDED option is set, in which case they
1123    are faulted.
1125    56. Introduced HOST_CC and HOST_CFLAGS which can be set in the environment when
1126    calling configure. These values are used when compiling the dftables.c program
1127    which is run to generate the source of the default character tables. They
1128    default to the values of CC and CFLAGS. If you are cross-compiling PCRE,
1129    you will need to set these values.
1131    57. Updated the building process for Windows DLL, as provided by Fred Cox.
1134    Version 3.9 02-Jan-02
1135    ---------------------
1137    1. A bit of extraneous text had somehow crept into the pcregrep documentation.
1139    2. If --disable-static was given, the building process failed when trying to
1140    build pcretest and pcregrep. (For some reason it was using libtool to compile
1141    them, which is not right, as they aren't part of the library.)
1144    Version 3.8 18-Dec-01
1145    ---------------------
1147    1. The experimental UTF-8 code was completely screwed up. It was packing the
1148    bytes in the wrong order. How dumb can you get?
1151    Version 3.7 29-Oct-01
1152    ---------------------
1154    1. In updating pcretest to check change 1 of version 3.6, I screwed up.
1155    This caused pcretest, when used on the test data, to segfault. Unfortunately,
1156    this didn't happen under Solaris 8, where I normally test things.
1158    2. The Makefile had to be changed to make it work on BSD systems, where 'make'
1159    doesn't seem to recognize that ./xxx and xxx are the same file. (This entry
1160    isn't in ChangeLog distributed with 3.7 because I forgot when I hastily made
1161    this fix an hour or so after the initial 3.7 release.)
1164    Version 3.6 23-Oct-01
1165    ---------------------
1167    1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
1168    offsets passed as NULL with zero offset count.
1170    2. The config.guess and config.sub files had not been updated when I moved to
1171    the latest autoconf.
1174    Version 3.5 15-Aug-01
1175    ---------------------
1177    1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
1178    had been forgotten.
1180    2. By using declared but undefined structures, we can avoid using "void"
1181    definitions in pcre.h while keeping the internal definitions of the structures
1182    private.
1184    3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
1185    user point of view, this means that both static and shared libraries are built
1186    by default, but this can be individually controlled. More of the work of
1187    handling this static/shared cases is now inside libtool instead of PCRE's make
1188    file.
1190    4. The pcretest utility is now installed along with pcregrep because it is
1191    useful for users (to test regexs) and by doing this, it automatically gets
1192    relinked by libtool. The documentation has been turned into a man page, so
1193    there are now .1, .txt, and .html versions in /doc.
1195    5. Upgrades to pcregrep:
1196       (i)   Added long-form option names like gnu grep.
1197       (ii)  Added --help to list all options with an explanatory phrase.
1198       (iii) Added -r, --recursive to recurse into sub-directories.
1199       (iv)  Added -f, --file to read patterns from a file.
1201    6. pcre_exec() was referring to its "code" argument before testing that
1202    argument for NULL (and giving an error if it was NULL).
1204    7. Upgraded Makefile.in to allow for compiling in a different directory from
1205    the source directory.
1207    8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
1208    options bits, the pointer it was passed was to an int instead of to an unsigned
1209    long int. This mattered only on 64-bit systems.
1211    9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
1212    generated) instead of pcre.in, which it its source. Also made the same change
1213    in several of the .c files.
1215    10. A new release of gcc defines printf() as a macro, which broke pcretest
1216    because it had an ifdef in the middle of a string argument for printf(). Fixed
1217    by using separate calls to printf().
1219    11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
1220    script, to force use of CR or LF instead of \n in the source. On non-Unix
1221    systems, the value can be set in config.h.
1223    12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
1224    absolute limit. Changed the text of the error message to make this clear, and
1225    likewise updated the man page.
1227    13. The limit of 99 on the number of capturing subpatterns has been removed.
1228    The new limit is 65535, which I hope will not be a "real" limit.
1231    Version 3.4 22-Aug-00
1232    ---------------------
1234    1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
1236    2. Diagnose condition (?(0) as an error instead of crashing on matching.
1239    Version 3.3 01-Aug-00
1240    ---------------------
1242    1. If an octal character was given, but the value was greater than \377, it
1243    was not getting masked to the least significant bits, as documented. This could
1244    lead to crashes in some systems.
1246    2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
1247    the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
1249    3. Added the functions pcre_free_substring() and pcre_free_substring_list().
1250    These just pass their arguments on to (pcre_free)(), but they are provided
1251    because some uses of PCRE bind it to non-C systems that can call its functions,
1252    but cannot call free() or pcre_free() directly.
1254    4. Add "make test" as a synonym for "make check". Corrected some comments in
1255    the Makefile.
1257    5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
1258    Makefile.
1260    6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
1261    command called pgrep for grepping around the active processes.
1263    7. Added the beginnings of support for UTF-8 character strings.
1265    8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
1266    RANLIB to ./ltconfig so that they are used by libtool. I think these are all
1267    the relevant ones. (AR is not passed because ./ltconfig does its own figuring
1268    out for the ar command.)
1271    Version 3.2 12-May-00
1272    ---------------------
1274    This is purely a bug fixing release.
1276    1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
1277    of ZA. This was just one example of several cases that could provoke this bug,
1278    which was introduced by change 9 of version 2.00. The code for breaking
1279    infinite loops after an iteration that matches an empty string was't working
1280    correctly.
1282    2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
1283    when matched against abbab (for example). After matching an empty string, it
1284    wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
1285    caused it to match further down the string than it should.
1287    3. The code contained an inclusion of sys/types.h. It isn't clear why this
1288    was there because it doesn't seem to be needed, and it causes trouble on some
1289    systems, as it is not a Standard C header. It has been removed.
1291    4. Made 4 silly changes to the source to avoid stupid compiler warnings that
1292    were reported on the Macintosh. The changes were from
1294      while ((c = *(++ptr)) != 0 && c != '\n');
1295    to
1296      while ((c = *(++ptr)) != 0 && c != '\n') ;
1298    Totally extraordinary, but if that's what it takes...
1300    5. PCRE is being used in one environment where neither memmove() nor bcopy() is
1301    available. Added HAVE_BCOPY and an autoconf test for it; if neither
1302    HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
1303    assumes the way PCRE uses memmove() (always moving upwards).
1305    6. PCRE is being used in one environment where strchr() is not available. There
1306    was only one use in pcre.c, and writing it out to avoid strchr() probably gives
1307    faster code anyway.
1310    Version 3.1 09-Feb-00
1311    ---------------------
1313    The only change in this release is the fixing of some bugs in Makefile.in for
1314    the "install" target:
1316    (1) It was failing to install pcreposix.h.
1318    (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
1321    Version 3.0 01-Feb-00
1322    ---------------------
1324    1. Add support for the /+ modifier to perltest (to output $` like it does in
1325    pcretest).
1327    2. Add support for the /g modifier to perltest.
1329    3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
1330    matches null strings.
1332    4. Fix perltest so that it doesn't do unwanted things when fed an empty
1333    pattern. Perl treats empty patterns specially - it reuses the most recent
1334    pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
1335    effect.
1337    5. The POSIX interface was broken in that it was just handing over the POSIX
1338    captured string vector to pcre_exec(), but (since release 2.00) PCRE has
1339    required a bigger vector, with some working space on the end. This means that
1340    the POSIX wrapper now has to get and free some memory, and copy the results.
1342    6. Added some simple autoconf support, placing the test data and the
1343    documentation in separate directories, re-organizing some of the
1344    information files, and making it build pcre-config (a GNU standard). Also added
1345    libtool support for building PCRE as a shared library, which is now the
1346    default.
1348    7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
1349    09 are not valid octal constants. Single digits will be used for minor values
1350    less than 10.
1352    8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
1353    existing programs that set these in the POSIX interface can use PCRE without
1354    modification.
1356    9. Added a new function, pcre_fullinfo() with an extensible interface. It can
1357    return all that pcre_info() returns, plus additional data. The pcre_info()
1358    function is retained for compatibility, but is considered to be obsolete.
1360    10. Added experimental recursion feature (?R) to handle one common case that
1361    Perl 5.6 will be able to do with (?p{...}).
1363    11. Added support for POSIX character classes like [:alpha:], which Perl is
1364    adopting.
1367    Version 2.08 31-Aug-99
1368    ----------------------
1370    1. When startoffset was not zero and the pattern began with ".*", PCRE was not
1371    trying to match at the startoffset position, but instead was moving forward to
1372    the next newline as if a previous match had failed.
1374    2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
1375    and could get into a loop if a null string was matched other than at the start
1376    of the subject.
1378    3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
1379    be distinguished at compile time, and for completeness also added PCRE_DATE.
1381    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
1382    in GnuWin32 environments.
1385    Version 2.07 29-Jul-99
1386    ----------------------
1388    1. The documentation is now supplied in plain text form and HTML as well as in
1389    the form of man page sources.
1391    2. C++ compilers don't like assigning (void *) values to other pointer types.
1392    In particular this affects malloc(). Although there is no problem in Standard
1393    C, I've put in casts to keep C++ compilers happy.
1395    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
1396    should be (const char *).
1398    4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
1399    be useful for non-Unix systems who don't want to bother with the POSIX stuff.
1400    However, I haven't made this a standard facility. The documentation doesn't
1401    mention it, and the Makefile doesn't support it.
1403    5. The Makefile now contains an "install" target, with editable destinations at
1404    the top of the file. The pcretest program is not installed.
1406    6. pgrep -V now gives the PCRE version number and date.
1408    7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
1409    causing the entire string to be ignored, instead of just the last character.
1411    8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
1412    non-matching string, it can take a very, very long time, even for strings of
1413    quite modest length, because of the nested recursion. PCRE now does better in
1414    some of these cases. It does this by remembering the last required literal
1415    character in the pattern, and pre-searching the subject to ensure it is present
1416    before running the real match. In other words, it applies a heuristic to detect
1417    some types of certain failure quickly, and in the above example, if presented
1418    with a string that has no trailing " it gives "no match" very quickly.
1420    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
1421    other alternatives are tried instead.
1424    Version 2.06 09-Jun-99
1425    ----------------------
1427    1. Change pcretest's output for amount of store used to show just the code
1428    space, because the remainder (the data block) varies in size between 32-bit and
1429    64-bit systems.
1431    2. Added an extra argument to pcre_exec() to supply an offset in the subject to
1432    start matching at. This allows lookbehinds to work when searching for multiple
1433    occurrences in a string.
1435    3. Added additional options to pcretest for testing multiple occurrences:
1437       /+   outputs the rest of the string that follows a match
1438       /g   loops for multiple occurrences, using the new startoffset argument
1439       /G   loops for multiple occurrences by passing an incremented pointer
1441    4. PCRE wasn't doing the "first character" optimization for patterns starting
1442    with \b or \B, though it was doing it for other lookbehind assertions. That is,
1443    it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
1444    the letter 'x'. On long subject strings, this gives a significant speed-up.
1447    Version 2.05 21-Apr-99
1448    ----------------------
1450    1. Changed the type of magic_number from int to long int so that it works
1451    properly on 16-bit systems.
1453    2. Fixed a bug which caused patterns starting with .* not to work correctly
1454    when the subject string contained newline characters. PCRE was assuming
1455    anchoring for such patterns in all cases, which is not correct because .* will
1456    not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
1457    DOTALL is set at top level; otherwise it knows that patterns starting with .*
1458    must be retried after every newline in the subject.
1461    Version 2.04 18-Feb-99
1462    ----------------------
1464    1. For parenthesized subpatterns with repeats whose minimum was zero, the
1465    computation of the store needed to hold the pattern was incorrect (too large).
1466    If such patterns were nested a few deep, this could multiply and become a real
1467    problem.
1469    2. Added /M option to pcretest to show the memory requirement of a specific
1470    pattern. Made -m a synonym of -s (which does this globally) for compatibility.
1472    3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
1473    compiled in such a way that the backtracking after subsequent failure was
1474    pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
1475    ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
1478    Version 2.03 02-Feb-99
1479    ----------------------
1481    1. Fixed typo and small mistake in man page.
1483    2. Added 4th condition (GPL supersedes if conflict) and created separate
1484    LICENCE file containing the conditions.
1486    3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
1487    Perl, that is the internal \ allows the delimiter to be included in the
1488    pattern. Locked out the use of \ as a delimiter. If \ immediately follows
1489    the final delimiter, add \ to the end of the pattern (to test the error).
1491    4. Added the convenience functions for extracting substrings after a successful
1492    match. Updated pcretest to make it able to test these functions.
1495    Version 2.02 14-Jan-99
1496    ----------------------
1498    1. Initialized the working variables associated with each extraction so that
1499    their saving and restoring doesn't refer to uninitialized store.
1501    2. Put dummy code into study.c in order to trick the optimizer of the IBM C
1502    compiler for OS/2 into generating correct code. Apparently IBM isn't going to
1503    fix the problem.
1505    3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
1506    calls, and wasn't printing the correct value for compiling calls. Increased the
1507    default value of LOOPREPEAT, and the number of significant figures in the
1508    times.
1510    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
1512    5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
1513    a building problem on Windows NT with a FAT file system.
1516    Version 2.01 21-Oct-98
1517    ----------------------
1519    1. Changed the API for pcre_compile() to allow for the provision of a pointer
1520    to character tables built by pcre_maketables() in the current locale. If NULL
1521    is passed, the default tables are used.
1524    Version 2.00 24-Sep-98
1525    ----------------------
1527    1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
1528    it any more.
1530    2. Allow quantification of (?>) groups, and make it work correctly.
1532    3. The first character computation wasn't working for (?>) groups.
1534    4. Correct the implementation of \Z (it is permitted to match on the \n at the
1535    end of the subject) and add 5.005's \z, which really does match only at the
1536    very end of the subject.
1538    5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
1540    6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
1541    DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
1542    localized options. All options to pcre_study() were also removed.
1544    7. Add other new features from 5.005:
1546       $(?<=           positive lookbehind
1547       $(?<!           negative lookbehind
1548       (?imsx-imsx)    added the unsetting capability
1549                       such a setting is global if at outer level; local otherwise
1550       (?imsx-imsx:)   non-capturing groups with option setting
1551       (?(cond)re|re)  conditional pattern matching
1553       A backreference to itself in a repeated group matches the previous
1554       captured string.
1556    8. General tidying up of studying (both automatic and via "study")
1557    consequential on the addition of new assertions.
1559    9. As in 5.005, unlimited repeated groups that could match an empty substring
1560    are no longer faulted at compile time. Instead, the loop is forcibly broken at
1561    runtime if any iteration does actually match an empty substring.
1563    10. Include the RunTest script in the distribution.
1565    11. Added tests from the Perl 5.005_02 distribution. This showed up a few
1566    discrepancies, some of which were old and were also with respect to 5.004. They
1567    have now been fixed.
1570    Version 1.09 28-Apr-98
1571    ----------------------
1573    1. A negated single character class followed by a quantifier with a minimum
1574    value of one (e.g.  [^x]{1,6}  ) was not compiled correctly. This could lead to
1575    program crashes, or just wrong answers. This did not apply to negated classes
1576    containing more than one character, or to minima other than one.
1579    Version 1.08 27-Mar-98
1580    ----------------------
1582    1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
1584    2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
1585    latter must appear before anything that relies on it in the pattern.
1588    Version 1.07 16-Feb-98
1589    ----------------------
1591    1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
1592    repeat of a potentially empty string).
1595  Version 1.06 23-Jan-98  Version 1.06 23-Jan-98
1596  ----------------------  ----------------------

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