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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.34 xx-xxxx-201x  Version 8.37 28-April-2015
5  --------------------------  --------------------------
6    
7    1.  When an (*ACCEPT) is triggered inside capturing parentheses, it arranges
8        for those parentheses to be closed with whatever has been captured so far.
9        However, it was failing to mark any other groups between the hightest
10        capture so far and the currrent group as "unset". Thus, the ovector for
11        those groups contained whatever was previously there. An example is the
12        pattern /(x)|((*ACCEPT))/ when matched against "abcd".
13    
14    2.  If an assertion condition was quantified with a minimum of zero (an odd
15        thing to do, but it happened), SIGSEGV or other misbehaviour could occur.
16    
17    3.  If a pattern in pcretest input had the P (POSIX) modifier followed by an
18        unrecognized modifier, a crash could occur.
19    
20    4.  An attempt to do global matching in pcretest with a zero-length ovector
21        caused a crash.
22    
23    5.  Fixed a memory leak during matching that could occur for a subpattern
24        subroutine call (recursive or otherwise) if the number of captured groups
25        that had to be saved was greater than ten.
26    
27    6.  Catch a bad opcode during auto-possessification after compiling a bad UTF
28        string with NO_UTF_CHECK. This is a tidyup, not a bug fix, as passing bad
29        UTF with NO_UTF_CHECK is documented as having an undefined outcome.
30    
31    7.  A UTF pattern containing a "not" match of a non-ASCII character and a
32        subroutine reference could loop at compile time. Example: /[^\xff]((?1))/.
33    
34    8. When a pattern is compiled, it remembers the highest back reference so that
35       when matching, if the ovector is too small, extra memory can be obtained to
36       use instead. A conditional subpattern whose condition is a check on a
37       capture having happened, such as, for example in the pattern
38       /^(?:(a)|b)(?(1)A|B)/, is another kind of back reference, but it was not
39       setting the highest backreference number. This mattered only if pcre_exec()
40       was called with an ovector that was too small to hold the capture, and there
41       was no other kind of back reference (a situation which is probably quite
42       rare). The effect of the bug was that the condition was always treated as
43       FALSE when the capture could not be consulted, leading to a incorrect
44       behaviour by pcre_exec(). This bug has been fixed.
45    
46    9. A reference to a duplicated named group (either a back reference or a test
47       for being set in a conditional) that occurred in a part of the pattern where
48       PCRE_DUPNAMES was not set caused the amount of memory needed for the pattern
49       to be incorrectly calculated, leading to overwriting.
50    
51    10. A mutually recursive set of back references such as (\2)(\1) caused a
52        segfault at study time (while trying to find the minimum matching length).
53        The infinite loop is now broken (with the minimum length unset, that is,
54        zero).
55    
56    11. If an assertion that was used as a condition was quantified with a minimum
57        of zero, matching went wrong. In particular, if the whole group had
58        unlimited repetition and could match an empty string, a segfault was
59        likely. The pattern (?(?=0)?)+ is an example that caused this. Perl allows
60        assertions to be quantified, but not if they are being used as conditions,
61        so the above pattern is faulted by Perl. PCRE has now been changed so that
62        it also rejects such patterns.
63    
64    12. A possessive capturing group such as (a)*+ with a minimum repeat of zero
65        failed to allow the zero-repeat case if pcre2_exec() was called with an
66        ovector too small to capture the group.
67    
68    13. Fixed two bugs in pcretest that were discovered by fuzzing and reported by
69        Red Hat Product Security:
70    
71        (a) A crash if /K and /F were both set with the option to save the compiled
72        pattern.
73    
74        (b) Another crash if the option to print captured substrings in a callout
75        was combined with setting a null ovector, for example \O\C+ as a subject
76        string.
77    
78    14. A pattern such as "((?2){0,1999}())?", which has a group containing a
79        forward reference repeated a large (but limited) number of times within a
80        repeated outer group that has a zero minimum quantifier, caused incorrect
81        code to be compiled, leading to the error "internal error:
82        previously-checked referenced subpattern not found" when an incorrect
83        memory address was read. This bug was reported as "heap overflow",
84        discovered by Kai Lu of Fortinet's FortiGuard Labs and given the CVE number
85        CVE-2015-2325.
86    
87    23. A pattern such as "((?+1)(\1))/" containing a forward reference subroutine
88        call within a group that also contained a recursive back reference caused
89        incorrect code to be compiled. This bug was reported as "heap overflow",
90        discovered by Kai Lu of Fortinet's FortiGuard Labs, and given the CVE
91        number CVE-2015-2326.
92    
93    24. Computing the size of the JIT read-only data in advance has been a source
94        of various issues, and new ones are still appear unfortunately. To fix
95        existing and future issues, size computation is eliminated from the code,
96        and replaced by on-demand memory allocation.
97    
98    25. A pattern such as /(?i)[A-`]/, where characters in the other case are
99        adjacent to the end of the range, and the range contained characters with
100        more than one other case, caused incorrect behaviour when compiled in UTF
101        mode. In that example, the range a-j was left out of the class.
102    
103    26. Fix JIT compilation of conditional blocks, which assertion
104        is converted to (*FAIL). E.g: /(?(?!))/.
105    
106    27. The pattern /(?(?!)^)/ caused references to random memory. This bug was
107        discovered by the LLVM fuzzer.
108    
109    28. The assertion (?!) is optimized to (*FAIL). This was not handled correctly
110        when this assertion was used as a condition, for example (?(?!)a|b). In
111        pcre2_match() it worked by luck; in pcre2_dfa_match() it gave an incorrect
112        error about an unsupported item.
113    
114    29. For some types of pattern, for example /Z*(|d*){216}/, the auto-
115        possessification code could take exponential time to complete. A recursion
116        depth limit of 1000 has been imposed to limit the resources used by this
117        optimization.
118    
119    30. A pattern such as /(*UTF)[\S\V\H]/, which contains a negated special class
120        such as \S in non-UCP mode, explicit wide characters (> 255) can be ignored
121        because \S ensures they are all in the class. The code for doing this was
122        interacting badly with the code for computing the amount of space needed to
123        compile the pattern, leading to a buffer overflow. This bug was discovered
124        by the LLVM fuzzer.
125    
126    31. A pattern such as /((?2)+)((?1))/ which has mutual recursion nested inside
127        other kinds of group caused stack overflow at compile time. This bug was
128        discovered by the LLVM fuzzer.
129    
130    32. A pattern such as /(?1)(?#?'){8}(a)/ which had a parenthesized comment
131        between a subroutine call and its quantifier was incorrectly compiled,
132        leading to buffer overflow or other errors. This bug was discovered by the
133        LLVM fuzzer.
134    
135    33. The illegal pattern /(?(?<E>.*!.*)?)/ was not being diagnosed as missing an
136        assertion after (?(. The code was failing to check the character after
137        (?(?< for the ! or = that would indicate a lookbehind assertion. This bug
138        was discovered by the LLVM fuzzer.
139    
140    34. A pattern such as /X((?2)()*+){2}+/ which has a possessive quantifier with
141        a fixed maximum following a group that contains a subroutine reference was
142        incorrectly compiled and could trigger buffer overflow. This bug was
143        discovered by the LLVM fuzzer.
144    
145    35. A mutual recursion within a lookbehind assertion such as (?<=((?2))((?1)))
146        caused a stack overflow instead of the diagnosis of a non-fixed length
147        lookbehind assertion. This bug was discovered by the LLVM fuzzer.
148    
149    36. The use of \K in a positive lookbehind assertion in a non-anchored pattern
150        (e.g. /(?<=\Ka)/) could make pcregrep loop.
151    
152    37. There was a similar problem to 36 in pcretest for global matches.
153    
154    38. If a greedy quantified \X was preceded by \C in UTF mode (e.g. \C\X*),
155        and a subsequent item in the pattern caused a non-match, backtracking over
156        the repeated \X did not stop, but carried on past the start of the subject,
157        causing reference to random memory and/or a segfault. There were also some
158        other cases where backtracking after \C could crash. This set of bugs was
159        discovered by the LLVM fuzzer.
160    
161    39. The function for finding the minimum length of a matching string could take
162        a very long time if mutual recursion was present many times in a pattern,
163        for example, /((?2){73}(?2))((?1))/. A better mutual recursion detection
164        method has been implemented. This infelicity was discovered by the LLVM
165        fuzzer.
166    
167    40. Static linking against the PCRE library using the pkg-config module was
168        failing on missing pthread symbols.
169    
170    
171    Version 8.36 26-September-2014
172    ------------------------------
173    
174    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
175        -Wmissing-field-initializers and -Wunused-parameter.
176    
177    2.  The tests for quantifiers being too big (greater than 65535) were being
178        applied after reading the number, and stupidly assuming that integer
179        overflow would give a negative number. The tests are now applied as the
180        numbers are read.
181    
182    3.  Tidy code in pcre_exec.c where two branches that used to be different are
183        now the same.
184    
185    4.  The JIT compiler did not generate match limit checks for certain
186        bracketed expressions with quantifiers. This may lead to exponential
187        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
188        issue should be resolved now.
189    
190    5.  Fixed an issue, which occures when nested alternatives are optimized
191        with table jumps.
192    
193    6.  Inserted two casts and changed some ints to size_t in the light of some
194        reported 64-bit compiler warnings (Bugzilla 1477).
195    
196    7.  Fixed a bug concerned with zero-minimum possessive groups that could match
197        an empty string, which sometimes were behaving incorrectly in the
198        interpreter (though correctly in the JIT matcher). This pcretest input is
199        an example:
200    
201          '\A(?:[^"]++|"(?:[^"]*+|"")*+")++'
202          NON QUOTED "QUOT""ED" AFTER "NOT MATCHED
203    
204        the interpreter was reporting a match of 'NON QUOTED ' only, whereas the
205        JIT matcher and Perl both matched 'NON QUOTED "QUOT""ED" AFTER '. The test
206        for an empty string was breaking the inner loop and carrying on at a lower
207        level, when possessive repeated groups should always return to a higher
208        level as they have no backtrack points in them. The empty string test now
209        occurs at the outer level.
210    
211    8.  Fixed a bug that was incorrectly auto-possessifying \w+ in the pattern
212        ^\w+(?>\s*)(?<=\w) which caused it not to match "test test".
213    
214    9.  Give a compile-time error for \o{} (as Perl does) and for \x{} (which Perl
215        doesn't).
216    
217    10. Change 8.34/15 introduced a bug that caused the amount of memory needed
218        to hold a pattern to be incorrectly computed (too small) when there were
219        named back references to duplicated names. This could cause "internal
220        error: code overflow" or "double free or corruption" or other memory
221        handling errors.
222    
223    11. When named subpatterns had the same prefixes, back references could be
224        confused. For example, in this pattern:
225    
226          /(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/
227    
228        the reference to 'Name' was incorrectly treated as a reference to a
229        duplicate name.
230    
231    12. A pattern such as /^s?c/mi8 where the optional character has more than
232        one "other case" was incorrectly compiled such that it would only try to
233        match starting at "c".
234    
235    13. When a pattern starting with \s was studied, VT was not included in the
236        list of possible starting characters; this should have been part of the
237        8.34/18 patch.
238    
239    14. If a character class started [\Qx]... where x is any character, the class
240        was incorrectly terminated at the ].
241    
242    15. If a pattern that started with a caseless match for a character with more
243        than one "other case" was studied, PCRE did not set up the starting code
244        unit bit map for the list of possible characters. Now it does. This is an
245        optimization improvement, not a bug fix.
246    
247    16. The Unicode data tables have been updated to Unicode 7.0.0.
248    
249    17. Fixed a number of memory leaks in pcregrep.
250    
251    18. Avoid a compiler warning (from some compilers) for a function call with
252        a cast that removes "const" from an lvalue by using an intermediate
253        variable (to which the compiler does not object).
254    
255    19. Incorrect code was compiled if a group that contained an internal recursive
256        back reference was optional (had quantifier with a minimum of zero). This
257        example compiled incorrect code: /(((a\2)|(a*)\g<-1>))*/ and other examples
258        caused segmentation faults because of stack overflows at compile time.
259    
260    20. A pattern such as /((?(R)a|(?1)))+/, which contains a recursion within a
261        group that is quantified with an indefinite repeat, caused a compile-time
262        loop which used up all the system stack and provoked a segmentation fault.
263        This was not the same bug as 19 above.
264    
265    21. Add PCRECPP_EXP_DECL declaration to operator<< in pcre_stringpiece.h.
266        Patch by Mike Frysinger.
267    
268    
269    Version 8.35 04-April-2014
270    --------------------------
271    
272    1.  A new flag is set, when property checks are present in an XCLASS.
273        When this flag is not set, PCRE can perform certain optimizations
274        such as studying these XCLASS-es.
275    
276    2.  The auto-possessification of character sets were improved: a normal
277        and an extended character set can be compared now. Furthermore
278        the JIT compiler optimizes more character set checks.
279    
280    3.  Got rid of some compiler warnings for potentially uninitialized variables
281        that show up only when compiled with -O2.
282    
283    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
284        of a match later then the end of the match. The pcretest program was not
285        handling the case sensibly - it was outputting from the start to the next
286        binary zero. It now reports this situation in a message, and outputs the
287        text from the end to the start.
288    
289    5.  Fast forward search is improved in JIT. Instead of the first three
290        characters, any three characters with fixed position can be searched.
291        Search order: first, last, middle.
292    
293    6.  Improve character range checks in JIT. Characters are read by an inprecise
294        function now, which returns with an unknown value if the character code is
295        above a certain threshold (e.g: 256). The only limitation is that the value
296        must be bigger than the threshold as well. This function is useful when
297        the characters above the threshold are handled in the same way.
298    
299    7.  The macros whose names start with RAWUCHAR are placeholders for a future
300        mode in which only the bottom 21 bits of 32-bit data items are used. To
301        make this more memorable for those maintaining the code, the names have
302        been changed to start with UCHAR21, and an extensive comment has been added
303        to their definition.
304    
305    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
306        to the export list in Makefile.am (they were accidentally omitted from the
307        8.34 tarball).
308    
309    9.  The informational output from pcretest used the phrase "starting byte set"
310        which is inappropriate for the 16-bit and 32-bit libraries. As the output
311        for "first char" and "need char" really means "non-UTF-char", I've changed
312        "byte" to "char", and slightly reworded the output. The documentation about
313        these values has also been (I hope) clarified.
314    
315    10. Another JIT related optimization: use table jumps for selecting the correct
316        backtracking path, when more than four alternatives are present inside a
317        bracket.
318    
319    11. Empty match is not possible, when the minimum length is greater than zero,
320        and there is no \K in the pattern. JIT should avoid empty match checks in
321        such cases.
322    
323    12. In a caseless character class with UCP support, when a character with more
324        than one alternative case was not the first character of a range, not all
325        the alternative cases were added to the class. For example, s and \x{17f}
326        are both alternative cases for S: the class [RST] was handled correctly,
327        but [R-T] was not.
328    
329    13. The configure.ac file always checked for pthread support when JIT was
330        enabled. This is not used in Windows, so I have put this test inside a
331        check for the presence of windows.h (which was already tested for).
332    
333    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
334        The algorithm provides a way to skip certain starting offsets, and usually
335        faster than linear prefix searches.
336    
337    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
338        as for 'fr_FR' and 'french'. For some reason, however, it then used the
339        Windows-specific input and output files, which have 'french' screwed in.
340        So this could never have worked. One of the problems with locales is that
341        they aren't always the same. I have now updated RunTest so that it checks
342        the output of the locale test (test 3) against three different output
343        files, and it allows the test to pass if any one of them matches. With luck
344        this should make the test pass on some versions of Solaris where it was
345        failing. Because of the uncertainty, the script did not used to stop if
346        test 3 failed; it now does. If further versions of a French locale ever
347        come to light, they can now easily be added.
348    
349    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
350        there was a message during ./configure, but it did not stop. This now
351        provokes an error. The invalid example in README has been corrected.
352        If a value less than the minimum is given, the minimum value has always
353        been used, but now a warning is given.
354    
355    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
356        was a bug in the test system, which is now fixed. Also, the list of various
357        configurations that are tested for each release did not have one with both
358        16/32 bits and --enable-bar-anycrlf. It now does.
359    
360    18. pcretest was missing "-C bsr" for displaying the \R default setting.
361    
362    19. Little endian PowerPC systems are supported now by the JIT compiler.
363    
364    20. The fast forward newline mechanism could enter to an infinite loop on
365        certain invalid UTF-8 input. Although we don't support these cases
366        this issue can be fixed by a performance optimization.
367    
368    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
369        not take account if existing stack usage. There is now a new global
370        variable called pcre_stack_guard that can be set to point to an external
371        function to check stack availability. It is called at the start of
372        processing every parenthesized group.
373    
374    22. A typo in the code meant that in ungreedy mode the max/min qualifier
375        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
376        not match "ab".
377    
378    23. When UTF was disabled, the JIT program reported some incorrect compile
379        errors. These messages are silenced now.
380    
381    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
382        compiler.
383    
384    25. Change all the temporary files used in RunGrepTest to be different to those
385        used by RunTest so that the tests can be run simultaneously, for example by
386        "make -j check".
387    
388    
389    Version 8.34 15-December-2013
390    -----------------------------
391    
392  1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT  1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
393      executable memory. Patch inspired by Carsten Klein.      executable memory. Patch inspired by Carsten Klein.
394    
395  2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although  2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
396      this macro is never tested and has no effect, because the work to support      this macro is never tested and has no effect, because the work to support
397      coverage involves only compiling and linking options and special targets in      coverage involves only compiling and linking options and special targets in
398      the Makefile. The comment in config.h implied that defining the macro would      the Makefile. The comment in config.h implied that defining the macro would
399      enable coverage support, which is totally false. There was also support for      enable coverage support, which is totally false. There was also support for
400      setting this macro in the CMake files (my fault, I just copied it from      setting this macro in the CMake files (my fault, I just copied it from
401      configure). SUPPORT_GCOV has now been removed.      configure). SUPPORT_GCOV has now been removed.
402    
403  3.  Make a small performance improvement in strlen16() and strlen32() in  3.  Make a small performance improvement in strlen16() and strlen32() in
404      pcretest.      pcretest.
405    
406  4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,  4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
407      detected by the Solaris compiler (gcc doesn't seem to be able to diagnose      detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
408      these cases). There was also one in pcretest.c.      these cases). There was also one in pcretest.c.
409    
410  5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.  5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
411    
412  6.  In UTF mode, the code for checking whether a group could match an empty  6.  In UTF mode, the code for checking whether a group could match an empty
413      string (which is used for indefinitely repeated groups to allow for      string (which is used for indefinitely repeated groups to allow for
# Line 31  Version 8.34 xx-xxxx-201x Line 416  Version 8.34 xx-xxxx-201x
416      data item and had a minimum repetition of zero (for example, [^\x{100}]* in      data item and had a minimum repetition of zero (for example, [^\x{100}]* in
417      UTF-8 mode). The effect was undefined: the group might or might not be      UTF-8 mode). The effect was undefined: the group might or might not be
418      deemed as matching an empty string, or the program might have crashed.      deemed as matching an empty string, or the program might have crashed.
419    
420  7.  The code for checking whether a group could match an empty string was not  7.  The code for checking whether a group could match an empty string was not
421      recognizing that \h, \H, \v, \V, and \R must match a character.      recognizing that \h, \H, \v, \V, and \R must match a character.
422    
423  8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match  8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
424      an empty string. If it can, pcretest shows this in its information output.      an empty string. If it can, pcretest shows this in its information output.
425    
426  9.  Fixed two related bugs that applied to Unicode extended grapheme clusters  9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
427      that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when      that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
428      matched by pcre_exec() without using JIT:      matched by pcre_exec() without using JIT:
429    
430      (a) If the rest of the pattern did not match after a maximal run of      (a) If the rest of the pattern did not match after a maximal run of
431          grapheme clusters, the code for backing up to try with fewer of them          grapheme clusters, the code for backing up to try with fewer of them
432          did not always back up over a full grapheme when characters that do not          did not always back up over a full grapheme when characters that do not
433          have the modifier quality were involved, e.g. Hangul syllables.          have the modifier quality were involved, e.g. Hangul syllables.
434    
435      (b) If the match point in a subject started with modifier character, and      (b) If the match point in a subject started with modifier character, and
436          there was no match, the code could incorrectly back up beyond the match          there was no match, the code could incorrectly back up beyond the match
437          point, and potentially beyond the first character in the subject,          point, and potentially beyond the first character in the subject,
438          leading to a segfault or an incorrect match result.          leading to a segfault or an incorrect match result.
439    
440  10. A conditional group with an assertion condition could lead to PCRE  10. A conditional group with an assertion condition could lead to PCRE
441      recording an incorrect first data item for a match if no other first data      recording an incorrect first data item for a match if no other first data
442      item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a      item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
443      first data item, and therefore matched "ca" after "c" instead of at the      first data item, and therefore matched "ca" after "c" instead of at the
444      start.      start.
445    
446  11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a  11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
447      bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.      bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
448    
449  12. The source of pcregrep now includes z/OS-specific code so that it can be  12. The source of pcregrep now includes z/OS-specific code so that it can be
450      compiled for z/OS as part of the special z/OS distribution.      compiled for z/OS as part of the special z/OS distribution.
451    
452  13. Added the -T and -TM options to pcretest.  13. Added the -T and -TM options to pcretest.
453    
454  14. The code in pcre_compile.c for creating the table of named capturing groups  14. The code in pcre_compile.c for creating the table of named capturing groups
455      has been refactored. Instead of creating the table dynamically during the      has been refactored. Instead of creating the table dynamically during the
456      actual compiling pass, the information is remembered during the pre-compile      actual compiling pass, the information is remembered during the pre-compile
457      pass (on the stack unless there are more than 20 named groups, in which      pass (on the stack unless there are more than 20 named groups, in which
458      case malloc() is used) and the whole table is created before the actual      case malloc() is used) and the whole table is created before the actual
459      compile happens. This has simplified the code (it is now nearly 150 lines      compile happens. This has simplified the code (it is now nearly 150 lines
460      shorter) and prepared the way for better handling of references to groups      shorter) and prepared the way for better handling of references to groups
461      with duplicate names.      with duplicate names.
462    
463  15. A back reference to a named subpattern when there is more than one of the  15. A back reference to a named subpattern when there is more than one of the
464      same name now checks them in the order in which they appear in the pattern.      same name now checks them in the order in which they appear in the pattern.
465      The first one that is set is used for the reference. Previously only the      The first one that is set is used for the reference. Previously only the
466      first one was inspected. This change makes PCRE more compatible with Perl.      first one was inspected. This change makes PCRE more compatible with Perl.
467    
468  16. Unicode character properties were updated from Unicode 6.3.0.  16. Unicode character properties were updated from Unicode 6.3.0.
469    
470  17. The compile-time code for auto-possessification has been refactored, based  17. The compile-time code for auto-possessification has been refactored, based
471      on a patch by Zoltan Herczeg. It now happens after instead of during      on a patch by Zoltan Herczeg. It now happens after instead of during
472      compilation. The code is cleaner, and more cases are handled. The option      compilation. The code is cleaner, and more cases are handled. The option
473      PCRE_NO_AUTO_POSSESSIFY is added for testing purposes, and the -O and /O      PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
474      options in pcretest are provided to set it.      options in pcretest are provided to set it. It can also be set by
475        (*NO_AUTO_POSSESS) at the start of a pattern.
476  18. The character VT has been added to the set of characters that match \s and  
477      are generally treated as white space, following this same change in Perl  18. The character VT has been added to the default ("C" locale) set of
478      5.18. There is now no difference between "Perl space" and "POSIX space".      characters that match \s and are generally treated as white space,
479        following this same change in Perl 5.18. There is now no difference between
480  19. The code for checking named groups as conditions, either for being set or      "Perl space" and "POSIX space". Whether VT is treated as white space in
481        other locales depends on the locale.
482    
483    19. The code for checking named groups as conditions, either for being set or
484      for being recursed, has been refactored (this is related to 14 and 15      for being recursed, has been refactored (this is related to 14 and 15
485      above). Processing unduplicated named groups should now be as fast at      above). Processing unduplicated named groups should now be as fast at
486      numerical groups, and processing duplicated groups should be faster than      numerical groups, and processing duplicated groups should be faster than
487      before.      before.
488    
489  20. Two patches to the CMake build system, by Alexander Barkov:  20. Two patches to the CMake build system, by Alexander Barkov:
490    
491        (1) Replace the "source" command by "." in CMakeLists.txt because        (1) Replace the "source" command by "." in CMakeLists.txt because
492            "source" is a bash-ism.            "source" is a bash-ism.
493    
494        (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;        (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
495            without these the CMake build does not work on Solaris.            without these the CMake build does not work on Solaris.
496    
497  21. Perl has changed its handling of \8 and \9. If there is no previously  21. Perl has changed its handling of \8 and \9. If there is no previously
498      encountered capturing group of those numbers, they are treated as the      encountered capturing group of those numbers, they are treated as the
499      literal characters 8 and 9 instead of a binary zero followed by the      literal characters 8 and 9 instead of a binary zero followed by the
500      literals. PCRE now does the same.      literals. PCRE now does the same.
501    
502  22. Following Perl, added \o{} to specify codepoints in octal, making it  22. Following Perl, added \o{} to specify codepoints in octal, making it
503      possible to specify values greater than 0777 and also making them      possible to specify values greater than 0777 and also making them
504      unambiguous.      unambiguous.
505    
506  23. Perl now gives an error for missing closing braces after \x{... instead of  23. Perl now gives an error for missing closing braces after \x{... instead of
507      treating the string as literal. PCRE now does the same.      treating the string as literal. PCRE now does the same.
508    
509  24. RunTest used to grumble if an inappropriate test was selected explicitly,  24. RunTest used to grumble if an inappropriate test was selected explicitly,
510      but just skip it when running all tests. This make it awkward to run ranges      but just skip it when running all tests. This make it awkward to run ranges
511      of tests when one of them was inappropriate. Now it just skips any      of tests when one of them was inappropriate. Now it just skips any
512      inappropriate tests, as it always did when running all tests.      inappropriate tests, as it always did when running all tests.
513    
514  25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained  25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
515      character types such as \d or \w, too many callouts were inserted, and the      character types such as \d or \w, too many callouts were inserted, and the
516      data that they returned was rubbish.      data that they returned was rubbish.
517    
518  26. In UCP mode, \s was not matching two of the characters that Perl matches,  26. In UCP mode, \s was not matching two of the characters that Perl matches,
519      namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they      namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
520      were matched by \h. The code has now been refactored so that the lists of      were matched by \h. The code has now been refactored so that the lists of
521      the horizontal and vertical whitespace characters used for \h and \v (which      the horizontal and vertical whitespace characters used for \h and \v (which
522      are defined only in one place) are now also used for \s.      are defined only in one place) are now also used for \s.
523    
524  27. Add JIT support for the 64 bit TileGX architecture.  27. Add JIT support for the 64 bit TileGX architecture.
525      Patch by Jiong Wang (Tilera Corporation).      Patch by Jiong Wang (Tilera Corporation).
526    
527  28. Possessive quantifiers for classes (both explicit and automatically  28. Possessive quantifiers for classes (both explicit and automatically
528      generated) now use special opcodes instead of wrapping in ONCE brackets.      generated) now use special opcodes instead of wrapping in ONCE brackets.
529    
530  29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier  29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
531      (because it's meaningless), this was not happening when PCRE_CASELESS was      (because it's meaningless), this was not happening when PCRE_CASELESS was
532      set. Not wrong, but inefficient.      set. Not wrong, but inefficient.
533    
534  30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode  30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
535      properties for \w, \d, etc) is present in a test regex. Otherwise if the      properties for \w, \d, etc) is present in a test regex. Otherwise if the
536      test contains no characters greater than 255, Perl doesn't realise it      test contains no characters greater than 255, Perl doesn't realise it
537      should be using Unicode semantics.      should be using Unicode semantics.
538    
539  31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and  31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
540      [:punct:] when PCRE_UCP is set so as to include the same characters as Perl      [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
541      does in Unicode mode.      does in Unicode mode.
542    
543  32. Added the "forbid" facility to pcretest so that putting tests into the  32. Added the "forbid" facility to pcretest so that putting tests into the
544      wrong test files can sometimes be quickly detected.      wrong test files can sometimes be quickly detected.
545    
546  33. There is now a limit (default 250) on the depth of nesting of parentheses.  33. There is now a limit (default 250) on the depth of nesting of parentheses.
547      This limit is imposed to control the amount of system stack used at compile      This limit is imposed to control the amount of system stack used at compile
548      time. It can be changed at build time by --with-parens-nest-limit=xxx or      time. It can be changed at build time by --with-parens-nest-limit=xxx or
549      the equivalent in CMake.      the equivalent in CMake.
550    
551  34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time  34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
552      errors. Perl warns for these when in warning mode, but PCRE has no facility      errors. Perl warns for these when in warning mode, but PCRE has no facility
553      for giving warnings.      for giving warnings.
554    
555    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
556        However, this was not working for (?!) because it is optimized to (*FAIL),
557        for which PCRE does not allow quantifiers. The optimization is now disabled
558        when a quantifier follows (?!). I can't see any use for this, but it makes
559        things uniform.
560    
561    36. Perl no longer allows group names to start with digits, so I have made this
562        change also in PCRE. It simplifies the code a bit.
563    
564    37. In extended mode, Perl ignores spaces before a + that indicates a
565        possessive quantifier. PCRE allowed a space before the quantifier, but not
566        before the possessive +. It now does.
567    
568    38. The use of \K (reset reported match start) within a repeated possessive
569        group such as (a\Kb)*+ was not working.
570    
571    40. Document that the same character tables must be used at compile time and
572        run time, and that the facility to pass tables to pcre_exec() and
573        pcre_dfa_exec() is for use only with saved/restored patterns.
574    
575    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
576        features for Builds with MSVC:
577    
578        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
579           builds). The .rc files can be used to set FileDescription and many other
580           attributes.
581    
582        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
583           This allows higher-level build scripts which want .pdb files to avoid
584           hard-coding the exact files needed."
585    
586    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
587        mean "start of word" and "end of word", respectively, as a transition aid.
588    
589    43. A minimizing repeat of a class containing codepoints greater than 255 in
590        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
591        compiled to use the heap for recursion.
592    
593    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
594        is configured.
595    
596    
597  Version 8.33 28-May-2013  Version 8.33 28-May-2013

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