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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.13 02-Aug-2011  Note that the PCRE 8.xx series (PCRE1) is now in a bugfix-only state. All
5    development is happening in the PCRE2 10.xx series.
7    Version 8.39 xx-xxxxxx-201x
8    ---------------------------
10    1.  If PCRE_AUTO_CALLOUT was set on a pattern that had a (?# comment between
11        an item and its qualifier (for example, A(?#comment)?B) pcre_compile()
12        misbehaved. This bug was found by the LLVM fuzzer.
14    2.  Similar to the above, if an isolated \E was present between an item and its
15        qualifier when PCRE_AUTO_CALLOUT was set, pcre_compile() misbehaved. This
16        bug was found by the LLVM fuzzer.
18    3.  Further to 8.38/46, negated classes such as [^[:^ascii:]\d] were also not
19        working correctly in UCP mode.
21    4.  The POSIX wrapper function regexec() crashed if the option REG_STARTEND
22        was set when the pmatch argument was NULL. It now returns REG_INVARG.
25    Version 8.38 23-November-2015
26    -----------------------------
28    1.  If a group that contained a recursive back reference also contained a
29        forward reference subroutine call followed by a non-forward-reference
30        subroutine call, for example /.((?2)(?R)\1)()/, pcre2_compile() failed to
31        compile correct code, leading to undefined behaviour or an internally
32        detected error. This bug was discovered by the LLVM fuzzer.
34    2.  Quantification of certain items (e.g. atomic back references) could cause
35        incorrect code to be compiled when recursive forward references were
36        involved. For example, in this pattern: /(?1)()((((((\1++))\x85)+)|))/.
37        This bug was discovered by the LLVM fuzzer.
39    3.  A repeated conditional group whose condition was a reference by name caused
40        a buffer overflow if there was more than one group with the given name.
41        This bug was discovered by the LLVM fuzzer.
43    4.  A recursive back reference by name within a group that had the same name as
44        another group caused a buffer overflow. For example:
45        /(?J)(?'d'(?'d'\g{d}))/. This bug was discovered by the LLVM fuzzer.
47    5.  A forward reference by name to a group whose number is the same as the
48        current group, for example in this pattern: /(?|(\k'Pm')|(?'Pm'))/, caused
49        a buffer overflow at compile time. This bug was discovered by the LLVM
50        fuzzer.
52    6.  A lookbehind assertion within a set of mutually recursive subpatterns could
53        provoke a buffer overflow. This bug was discovered by the LLVM fuzzer.
55    7.  Another buffer overflow bug involved duplicate named groups with a
56        reference between their definition, with a group that reset capture
57        numbers, for example: /(?J:(?|(?'R')(\k'R')|((?'R'))))/. This has been
58        fixed by always allowing for more memory, even if not needed. (A proper fix
59        is implemented in PCRE2, but it involves more refactoring.)
61    8.  There was no check for integer overflow in subroutine calls such as (?123).
63    9.  The table entry for \l in EBCDIC environments was incorrect, leading to its
64        being treated as a literal 'l' instead of causing an error.
66    10. There was a buffer overflow if pcre_exec() was called with an ovector of
67        size 1. This bug was found by american fuzzy lop.
69    11. If a non-capturing group containing a conditional group that could match
70        an empty string was repeated, it was not identified as matching an empty
71        string itself. For example: /^(?:(?(1)x|)+)+$()/.
73    12. In an EBCDIC environment, pcretest was mishandling the escape sequences
74        \a and \e in test subject lines.
76    13. In an EBCDIC environment, \a in a pattern was converted to the ASCII
77        instead of the EBCDIC value.
79    14. The handling of \c in an EBCDIC environment has been revised so that it is
80        now compatible with the specification in Perl's perlebcdic page.
82    15. The EBCDIC character 0x41 is a non-breaking space, equivalent to 0xa0 in
83        ASCII/Unicode. This has now been added to the list of characters that are
84        recognized as white space in EBCDIC.
86    16. When PCRE was compiled without UCP support, the use of \p and \P gave an
87        error (correctly) when used outside a class, but did not give an error
88        within a class.
90    17. \h within a class was incorrectly compiled in EBCDIC environments.
92    18. A pattern with an unmatched closing parenthesis that contained a backward
93        assertion which itself contained a forward reference caused buffer
94        overflow. And example pattern is: /(?=di(?<=(?1))|(?=(.))))/.
96    19. JIT should return with error when the compiled pattern requires more stack
97        space than the maximum.
99    20. A possessively repeated conditional group that could match an empty string,
100        for example, /(?(R))*+/, was incorrectly compiled.
102    21. Fix infinite recursion in the JIT compiler when certain patterns such as
103        /(?:|a|){100}x/ are analysed.
105    22. Some patterns with character classes involving [: and \\ were incorrectly
106        compiled and could cause reading from uninitialized memory or an incorrect
107        error diagnosis.
109    23. Pathological patterns containing many nested occurrences of [: caused
110        pcre_compile() to run for a very long time.
112    24. A conditional group with only one branch has an implicit empty alternative
113        branch and must therefore be treated as potentially matching an empty
114        string.
116    25. If (?R was followed by - or + incorrect behaviour happened instead of a
117        diagnostic.
119    26. Arrange to give up on finding the minimum matching length for overly
120        complex patterns.
122    27. Similar to (4) above: in a pattern with duplicated named groups and an
123        occurrence of (?| it is possible for an apparently non-recursive back
124        reference to become recursive if a later named group with the relevant
125        number is encountered. This could lead to a buffer overflow. Wen Guanxing
126        from Venustech ADLAB discovered this bug.
128    28. If pcregrep was given the -q option with -c or -l, or when handling a
129        binary file, it incorrectly wrote output to stdout.
131    29. The JIT compiler did not restore the control verb head in case of *THEN
132        control verbs. This issue was found by Karl Skomski with a custom LLVM
133        fuzzer.
135    30. Error messages for syntax errors following \g and \k were giving inaccurate
136        offsets in the pattern.
138    31. Added a check for integer overflow in conditions (?(<digits>) and
139        (?(R<digits>). This omission was discovered by Karl Skomski with the LLVM
140        fuzzer.
142    32. Handling recursive references such as (?2) when the reference is to a group
143        later in the pattern uses code that is very hacked about and error-prone.
144        It has been re-written for PCRE2. Here in PCRE1, a check has been added to
145        give an internal error if it is obvious that compiling has gone wrong.
147    33. The JIT compiler should not check repeats after a {0,1} repeat byte code.
148        This issue was found by Karl Skomski with a custom LLVM fuzzer.
150    34. The JIT compiler should restore the control chain for empty possessive
151        repeats. This issue was found by Karl Skomski with a custom LLVM fuzzer.
153    35. Match limit check added to JIT recursion. This issue was found by Karl
154        Skomski with a custom LLVM fuzzer.
156    36. Yet another case similar to 27 above has been circumvented by an
157        unconditional allocation of extra memory. This issue is fixed "properly" in
158        PCRE2 by refactoring the way references are handled. Wen Guanxing
159        from Venustech ADLAB discovered this bug.
161    37. Fix two assertion fails in JIT. These issues were found by Karl Skomski
162        with a custom LLVM fuzzer.
164    38. Fixed a corner case of range optimization in JIT.
166    39. An incorrect error "overran compiling workspace" was given if there were
167        exactly enough group forward references such that the last one extended
168        into the workspace safety margin. The next one would have expanded the
169        workspace. The test for overflow was not including the safety margin.
171    40. A match limit issue is fixed in JIT which was found by Karl Skomski
172        with a custom LLVM fuzzer.
174    41. Remove the use of /dev/null in testdata/testinput2, because it doesn't
175        work under Windows. (Why has it taken so long for anyone to notice?)
177    42. In a character class such as [\W\p{Any}] where both a negative-type escape
178        ("not a word character") and a property escape were present, the property
179        escape was being ignored.
181    43. Fix crash caused by very long (*MARK) or (*THEN) names.
183    44. A sequence such as [[:punct:]b] that is, a POSIX character class followed
184        by a single ASCII character in a class item, was incorrectly compiled in
185        UCP mode. The POSIX class got lost, but only if the single character
186        followed it.
188    45. [:punct:] in UCP mode was matching some characters in the range 128-255
189        that should not have been matched.
191    46. If [:^ascii:] or [:^xdigit:] or [:^cntrl:] are present in a non-negated
192        class, all characters with code points greater than 255 are in the class.
193        When a Unicode property was also in the class (if PCRE_UCP is set, escapes
194        such as \w are turned into Unicode properties), wide characters were not
195        correctly handled, and could fail to match.
198    Version 8.37 28-April-2015
199    --------------------------
201    1.  When an (*ACCEPT) is triggered inside capturing parentheses, it arranges
202        for those parentheses to be closed with whatever has been captured so far.
203        However, it was failing to mark any other groups between the hightest
204        capture so far and the currrent group as "unset". Thus, the ovector for
205        those groups contained whatever was previously there. An example is the
206        pattern /(x)|((*ACCEPT))/ when matched against "abcd".
208    2.  If an assertion condition was quantified with a minimum of zero (an odd
209        thing to do, but it happened), SIGSEGV or other misbehaviour could occur.
211    3.  If a pattern in pcretest input had the P (POSIX) modifier followed by an
212        unrecognized modifier, a crash could occur.
214    4.  An attempt to do global matching in pcretest with a zero-length ovector
215        caused a crash.
217    5.  Fixed a memory leak during matching that could occur for a subpattern
218        subroutine call (recursive or otherwise) if the number of captured groups
219        that had to be saved was greater than ten.
221    6.  Catch a bad opcode during auto-possessification after compiling a bad UTF
222        string with NO_UTF_CHECK. This is a tidyup, not a bug fix, as passing bad
223        UTF with NO_UTF_CHECK is documented as having an undefined outcome.
225    7.  A UTF pattern containing a "not" match of a non-ASCII character and a
226        subroutine reference could loop at compile time. Example: /[^\xff]((?1))/.
228    8. When a pattern is compiled, it remembers the highest back reference so that
229       when matching, if the ovector is too small, extra memory can be obtained to
230       use instead. A conditional subpattern whose condition is a check on a
231       capture having happened, such as, for example in the pattern
232       /^(?:(a)|b)(?(1)A|B)/, is another kind of back reference, but it was not
233       setting the highest backreference number. This mattered only if pcre_exec()
234       was called with an ovector that was too small to hold the capture, and there
235       was no other kind of back reference (a situation which is probably quite
236       rare). The effect of the bug was that the condition was always treated as
237       FALSE when the capture could not be consulted, leading to a incorrect
238       behaviour by pcre_exec(). This bug has been fixed.
240    9. A reference to a duplicated named group (either a back reference or a test
241       for being set in a conditional) that occurred in a part of the pattern where
242       PCRE_DUPNAMES was not set caused the amount of memory needed for the pattern
243       to be incorrectly calculated, leading to overwriting.
245    10. A mutually recursive set of back references such as (\2)(\1) caused a
246        segfault at study time (while trying to find the minimum matching length).
247        The infinite loop is now broken (with the minimum length unset, that is,
248        zero).
250    11. If an assertion that was used as a condition was quantified with a minimum
251        of zero, matching went wrong. In particular, if the whole group had
252        unlimited repetition and could match an empty string, a segfault was
253        likely. The pattern (?(?=0)?)+ is an example that caused this. Perl allows
254        assertions to be quantified, but not if they are being used as conditions,
255        so the above pattern is faulted by Perl. PCRE has now been changed so that
256        it also rejects such patterns.
258    12. A possessive capturing group such as (a)*+ with a minimum repeat of zero
259        failed to allow the zero-repeat case if pcre2_exec() was called with an
260        ovector too small to capture the group.
262    13. Fixed two bugs in pcretest that were discovered by fuzzing and reported by
263        Red Hat Product Security:
265        (a) A crash if /K and /F were both set with the option to save the compiled
266        pattern.
268        (b) Another crash if the option to print captured substrings in a callout
269        was combined with setting a null ovector, for example \O\C+ as a subject
270        string.
272    14. A pattern such as "((?2){0,1999}())?", which has a group containing a
273        forward reference repeated a large (but limited) number of times within a
274        repeated outer group that has a zero minimum quantifier, caused incorrect
275        code to be compiled, leading to the error "internal error:
276        previously-checked referenced subpattern not found" when an incorrect
277        memory address was read. This bug was reported as "heap overflow",
278        discovered by Kai Lu of Fortinet's FortiGuard Labs and given the CVE number
279        CVE-2015-2325.
281    23. A pattern such as "((?+1)(\1))/" containing a forward reference subroutine
282        call within a group that also contained a recursive back reference caused
283        incorrect code to be compiled. This bug was reported as "heap overflow",
284        discovered by Kai Lu of Fortinet's FortiGuard Labs, and given the CVE
285        number CVE-2015-2326.
287    24. Computing the size of the JIT read-only data in advance has been a source
288        of various issues, and new ones are still appear unfortunately. To fix
289        existing and future issues, size computation is eliminated from the code,
290        and replaced by on-demand memory allocation.
292    25. A pattern such as /(?i)[A-`]/, where characters in the other case are
293        adjacent to the end of the range, and the range contained characters with
294        more than one other case, caused incorrect behaviour when compiled in UTF
295        mode. In that example, the range a-j was left out of the class.
297    26. Fix JIT compilation of conditional blocks, which assertion
298        is converted to (*FAIL). E.g: /(?(?!))/.
300    27. The pattern /(?(?!)^)/ caused references to random memory. This bug was
301        discovered by the LLVM fuzzer.
303    28. The assertion (?!) is optimized to (*FAIL). This was not handled correctly
304        when this assertion was used as a condition, for example (?(?!)a|b). In
305        pcre2_match() it worked by luck; in pcre2_dfa_match() it gave an incorrect
306        error about an unsupported item.
308    29. For some types of pattern, for example /Z*(|d*){216}/, the auto-
309        possessification code could take exponential time to complete. A recursion
310        depth limit of 1000 has been imposed to limit the resources used by this
311        optimization.
313    30. A pattern such as /(*UTF)[\S\V\H]/, which contains a negated special class
314        such as \S in non-UCP mode, explicit wide characters (> 255) can be ignored
315        because \S ensures they are all in the class. The code for doing this was
316        interacting badly with the code for computing the amount of space needed to
317        compile the pattern, leading to a buffer overflow. This bug was discovered
318        by the LLVM fuzzer.
320    31. A pattern such as /((?2)+)((?1))/ which has mutual recursion nested inside
321        other kinds of group caused stack overflow at compile time. This bug was
322        discovered by the LLVM fuzzer.
324    32. A pattern such as /(?1)(?#?'){8}(a)/ which had a parenthesized comment
325        between a subroutine call and its quantifier was incorrectly compiled,
326        leading to buffer overflow or other errors. This bug was discovered by the
327        LLVM fuzzer.
329    33. The illegal pattern /(?(?<E>.*!.*)?)/ was not being diagnosed as missing an
330        assertion after (?(. The code was failing to check the character after
331        (?(?< for the ! or = that would indicate a lookbehind assertion. This bug
332        was discovered by the LLVM fuzzer.
334    34. A pattern such as /X((?2)()*+){2}+/ which has a possessive quantifier with
335        a fixed maximum following a group that contains a subroutine reference was
336        incorrectly compiled and could trigger buffer overflow. This bug was
337        discovered by the LLVM fuzzer.
339    35. A mutual recursion within a lookbehind assertion such as (?<=((?2))((?1)))
340        caused a stack overflow instead of the diagnosis of a non-fixed length
341        lookbehind assertion. This bug was discovered by the LLVM fuzzer.
343    36. The use of \K in a positive lookbehind assertion in a non-anchored pattern
344        (e.g. /(?<=\Ka)/) could make pcregrep loop.
346    37. There was a similar problem to 36 in pcretest for global matches.
348    38. If a greedy quantified \X was preceded by \C in UTF mode (e.g. \C\X*),
349        and a subsequent item in the pattern caused a non-match, backtracking over
350        the repeated \X did not stop, but carried on past the start of the subject,
351        causing reference to random memory and/or a segfault. There were also some
352        other cases where backtracking after \C could crash. This set of bugs was
353        discovered by the LLVM fuzzer.
355    39. The function for finding the minimum length of a matching string could take
356        a very long time if mutual recursion was present many times in a pattern,
357        for example, /((?2){73}(?2))((?1))/. A better mutual recursion detection
358        method has been implemented. This infelicity was discovered by the LLVM
359        fuzzer.
361    40. Static linking against the PCRE library using the pkg-config module was
362        failing on missing pthread symbols.
365    Version 8.36 26-September-2014
366    ------------------------------
368    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
369        -Wmissing-field-initializers and -Wunused-parameter.
371    2.  The tests for quantifiers being too big (greater than 65535) were being
372        applied after reading the number, and stupidly assuming that integer
373        overflow would give a negative number. The tests are now applied as the
374        numbers are read.
376    3.  Tidy code in pcre_exec.c where two branches that used to be different are
377        now the same.
379    4.  The JIT compiler did not generate match limit checks for certain
380        bracketed expressions with quantifiers. This may lead to exponential
381        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
382        issue should be resolved now.
384    5.  Fixed an issue, which occures when nested alternatives are optimized
385        with table jumps.
387    6.  Inserted two casts and changed some ints to size_t in the light of some
388        reported 64-bit compiler warnings (Bugzilla 1477).
390    7.  Fixed a bug concerned with zero-minimum possessive groups that could match
391        an empty string, which sometimes were behaving incorrectly in the
392        interpreter (though correctly in the JIT matcher). This pcretest input is
393        an example:
395          '\A(?:[^"]++|"(?:[^"]*+|"")*+")++'
398        the interpreter was reporting a match of 'NON QUOTED ' only, whereas the
399        JIT matcher and Perl both matched 'NON QUOTED "QUOT""ED" AFTER '. The test
400        for an empty string was breaking the inner loop and carrying on at a lower
401        level, when possessive repeated groups should always return to a higher
402        level as they have no backtrack points in them. The empty string test now
403        occurs at the outer level.
405    8.  Fixed a bug that was incorrectly auto-possessifying \w+ in the pattern
406        ^\w+(?>\s*)(?<=\w) which caused it not to match "test test".
408    9.  Give a compile-time error for \o{} (as Perl does) and for \x{} (which Perl
409        doesn't).
411    10. Change 8.34/15 introduced a bug that caused the amount of memory needed
412        to hold a pattern to be incorrectly computed (too small) when there were
413        named back references to duplicated names. This could cause "internal
414        error: code overflow" or "double free or corruption" or other memory
415        handling errors.
417    11. When named subpatterns had the same prefixes, back references could be
418        confused. For example, in this pattern:
420          /(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/
422        the reference to 'Name' was incorrectly treated as a reference to a
423        duplicate name.
425    12. A pattern such as /^s?c/mi8 where the optional character has more than
426        one "other case" was incorrectly compiled such that it would only try to
427        match starting at "c".
429    13. When a pattern starting with \s was studied, VT was not included in the
430        list of possible starting characters; this should have been part of the
431        8.34/18 patch.
433    14. If a character class started [\Qx]... where x is any character, the class
434        was incorrectly terminated at the ].
436    15. If a pattern that started with a caseless match for a character with more
437        than one "other case" was studied, PCRE did not set up the starting code
438        unit bit map for the list of possible characters. Now it does. This is an
439        optimization improvement, not a bug fix.
441    16. The Unicode data tables have been updated to Unicode 7.0.0.
443    17. Fixed a number of memory leaks in pcregrep.
445    18. Avoid a compiler warning (from some compilers) for a function call with
446        a cast that removes "const" from an lvalue by using an intermediate
447        variable (to which the compiler does not object).
449    19. Incorrect code was compiled if a group that contained an internal recursive
450        back reference was optional (had quantifier with a minimum of zero). This
451        example compiled incorrect code: /(((a\2)|(a*)\g<-1>))*/ and other examples
452        caused segmentation faults because of stack overflows at compile time.
454    20. A pattern such as /((?(R)a|(?1)))+/, which contains a recursion within a
455        group that is quantified with an indefinite repeat, caused a compile-time
456        loop which used up all the system stack and provoked a segmentation fault.
457        This was not the same bug as 19 above.
459    21. Add PCRECPP_EXP_DECL declaration to operator<< in pcre_stringpiece.h.
460        Patch by Mike Frysinger.
463    Version 8.35 04-April-2014
464    --------------------------
466    1.  A new flag is set, when property checks are present in an XCLASS.
467        When this flag is not set, PCRE can perform certain optimizations
468        such as studying these XCLASS-es.
470    2.  The auto-possessification of character sets were improved: a normal
471        and an extended character set can be compared now. Furthermore
472        the JIT compiler optimizes more character set checks.
474    3.  Got rid of some compiler warnings for potentially uninitialized variables
475        that show up only when compiled with -O2.
477    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
478        of a match later then the end of the match. The pcretest program was not
479        handling the case sensibly - it was outputting from the start to the next
480        binary zero. It now reports this situation in a message, and outputs the
481        text from the end to the start.
483    5.  Fast forward search is improved in JIT. Instead of the first three
484        characters, any three characters with fixed position can be searched.
485        Search order: first, last, middle.
487    6.  Improve character range checks in JIT. Characters are read by an inprecise
488        function now, which returns with an unknown value if the character code is
489        above a certain threshold (e.g: 256). The only limitation is that the value
490        must be bigger than the threshold as well. This function is useful when
491        the characters above the threshold are handled in the same way.
493    7.  The macros whose names start with RAWUCHAR are placeholders for a future
494        mode in which only the bottom 21 bits of 32-bit data items are used. To
495        make this more memorable for those maintaining the code, the names have
496        been changed to start with UCHAR21, and an extensive comment has been added
497        to their definition.
499    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
500        to the export list in Makefile.am (they were accidentally omitted from the
501        8.34 tarball).
503    9.  The informational output from pcretest used the phrase "starting byte set"
504        which is inappropriate for the 16-bit and 32-bit libraries. As the output
505        for "first char" and "need char" really means "non-UTF-char", I've changed
506        "byte" to "char", and slightly reworded the output. The documentation about
507        these values has also been (I hope) clarified.
509    10. Another JIT related optimization: use table jumps for selecting the correct
510        backtracking path, when more than four alternatives are present inside a
511        bracket.
513    11. Empty match is not possible, when the minimum length is greater than zero,
514        and there is no \K in the pattern. JIT should avoid empty match checks in
515        such cases.
517    12. In a caseless character class with UCP support, when a character with more
518        than one alternative case was not the first character of a range, not all
519        the alternative cases were added to the class. For example, s and \x{17f}
520        are both alternative cases for S: the class [RST] was handled correctly,
521        but [R-T] was not.
523    13. The configure.ac file always checked for pthread support when JIT was
524        enabled. This is not used in Windows, so I have put this test inside a
525        check for the presence of windows.h (which was already tested for).
527    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
528        The algorithm provides a way to skip certain starting offsets, and usually
529        faster than linear prefix searches.
531    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
532        as for 'fr_FR' and 'french'. For some reason, however, it then used the
533        Windows-specific input and output files, which have 'french' screwed in.
534        So this could never have worked. One of the problems with locales is that
535        they aren't always the same. I have now updated RunTest so that it checks
536        the output of the locale test (test 3) against three different output
537        files, and it allows the test to pass if any one of them matches. With luck
538        this should make the test pass on some versions of Solaris where it was
539        failing. Because of the uncertainty, the script did not used to stop if
540        test 3 failed; it now does. If further versions of a French locale ever
541        come to light, they can now easily be added.
543    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
544        there was a message during ./configure, but it did not stop. This now
545        provokes an error. The invalid example in README has been corrected.
546        If a value less than the minimum is given, the minimum value has always
547        been used, but now a warning is given.
549    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
550        was a bug in the test system, which is now fixed. Also, the list of various
551        configurations that are tested for each release did not have one with both
552        16/32 bits and --enable-bar-anycrlf. It now does.
554    18. pcretest was missing "-C bsr" for displaying the \R default setting.
556    19. Little endian PowerPC systems are supported now by the JIT compiler.
558    20. The fast forward newline mechanism could enter to an infinite loop on
559        certain invalid UTF-8 input. Although we don't support these cases
560        this issue can be fixed by a performance optimization.
562    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
563        not take account if existing stack usage. There is now a new global
564        variable called pcre_stack_guard that can be set to point to an external
565        function to check stack availability. It is called at the start of
566        processing every parenthesized group.
568    22. A typo in the code meant that in ungreedy mode the max/min qualifier
569        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
570        not match "ab".
572    23. When UTF was disabled, the JIT program reported some incorrect compile
573        errors. These messages are silenced now.
575    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
576        compiler.
578    25. Change all the temporary files used in RunGrepTest to be different to those
579        used by RunTest so that the tests can be run simultaneously, for example by
580        "make -j check".
583    Version 8.34 15-December-2013
584    -----------------------------
586    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
587        executable memory. Patch inspired by Carsten Klein.
589    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
590        this macro is never tested and has no effect, because the work to support
591        coverage involves only compiling and linking options and special targets in
592        the Makefile. The comment in config.h implied that defining the macro would
593        enable coverage support, which is totally false. There was also support for
594        setting this macro in the CMake files (my fault, I just copied it from
595        configure). SUPPORT_GCOV has now been removed.
597    3.  Make a small performance improvement in strlen16() and strlen32() in
598        pcretest.
600    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
601        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
602        these cases). There was also one in pcretest.c.
604    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
606    6.  In UTF mode, the code for checking whether a group could match an empty
607        string (which is used for indefinitely repeated groups to allow for
608        breaking an infinite loop) was broken when the group contained a repeated
609        negated single-character class with a character that occupied more than one
610        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
611        UTF-8 mode). The effect was undefined: the group might or might not be
612        deemed as matching an empty string, or the program might have crashed.
614    7.  The code for checking whether a group could match an empty string was not
615        recognizing that \h, \H, \v, \V, and \R must match a character.
617    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
618        an empty string. If it can, pcretest shows this in its information output.
620    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
621        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
622        matched by pcre_exec() without using JIT:
624        (a) If the rest of the pattern did not match after a maximal run of
625            grapheme clusters, the code for backing up to try with fewer of them
626            did not always back up over a full grapheme when characters that do not
627            have the modifier quality were involved, e.g. Hangul syllables.
629        (b) If the match point in a subject started with modifier character, and
630            there was no match, the code could incorrectly back up beyond the match
631            point, and potentially beyond the first character in the subject,
632            leading to a segfault or an incorrect match result.
634    10. A conditional group with an assertion condition could lead to PCRE
635        recording an incorrect first data item for a match if no other first data
636        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
637        first data item, and therefore matched "ca" after "c" instead of at the
638        start.
640    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
641        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
643    12. The source of pcregrep now includes z/OS-specific code so that it can be
644        compiled for z/OS as part of the special z/OS distribution.
646    13. Added the -T and -TM options to pcretest.
648    14. The code in pcre_compile.c for creating the table of named capturing groups
649        has been refactored. Instead of creating the table dynamically during the
650        actual compiling pass, the information is remembered during the pre-compile
651        pass (on the stack unless there are more than 20 named groups, in which
652        case malloc() is used) and the whole table is created before the actual
653        compile happens. This has simplified the code (it is now nearly 150 lines
654        shorter) and prepared the way for better handling of references to groups
655        with duplicate names.
657    15. A back reference to a named subpattern when there is more than one of the
658        same name now checks them in the order in which they appear in the pattern.
659        The first one that is set is used for the reference. Previously only the
660        first one was inspected. This change makes PCRE more compatible with Perl.
662    16. Unicode character properties were updated from Unicode 6.3.0.
664    17. The compile-time code for auto-possessification has been refactored, based
665        on a patch by Zoltan Herczeg. It now happens after instead of during
666        compilation. The code is cleaner, and more cases are handled. The option
667        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
668        options in pcretest are provided to set it. It can also be set by
669        (*NO_AUTO_POSSESS) at the start of a pattern.
671    18. The character VT has been added to the default ("C" locale) set of
672        characters that match \s and are generally treated as white space,
673        following this same change in Perl 5.18. There is now no difference between
674        "Perl space" and "POSIX space". Whether VT is treated as white space in
675        other locales depends on the locale.
677    19. The code for checking named groups as conditions, either for being set or
678        for being recursed, has been refactored (this is related to 14 and 15
679        above). Processing unduplicated named groups should now be as fast at
680        numerical groups, and processing duplicated groups should be faster than
681        before.
683    20. Two patches to the CMake build system, by Alexander Barkov:
685          (1) Replace the "source" command by "." in CMakeLists.txt because
686              "source" is a bash-ism.
688          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
689              without these the CMake build does not work on Solaris.
691    21. Perl has changed its handling of \8 and \9. If there is no previously
692        encountered capturing group of those numbers, they are treated as the
693        literal characters 8 and 9 instead of a binary zero followed by the
694        literals. PCRE now does the same.
696    22. Following Perl, added \o{} to specify codepoints in octal, making it
697        possible to specify values greater than 0777 and also making them
698        unambiguous.
700    23. Perl now gives an error for missing closing braces after \x{... instead of
701        treating the string as literal. PCRE now does the same.
703    24. RunTest used to grumble if an inappropriate test was selected explicitly,
704        but just skip it when running all tests. This make it awkward to run ranges
705        of tests when one of them was inappropriate. Now it just skips any
706        inappropriate tests, as it always did when running all tests.
708    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
709        character types such as \d or \w, too many callouts were inserted, and the
710        data that they returned was rubbish.
712    26. In UCP mode, \s was not matching two of the characters that Perl matches,
713        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
714        were matched by \h. The code has now been refactored so that the lists of
715        the horizontal and vertical whitespace characters used for \h and \v (which
716        are defined only in one place) are now also used for \s.
718    27. Add JIT support for the 64 bit TileGX architecture.
719        Patch by Jiong Wang (Tilera Corporation).
721    28. Possessive quantifiers for classes (both explicit and automatically
722        generated) now use special opcodes instead of wrapping in ONCE brackets.
724    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
725        (because it's meaningless), this was not happening when PCRE_CASELESS was
726        set. Not wrong, but inefficient.
728    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
729        properties for \w, \d, etc) is present in a test regex. Otherwise if the
730        test contains no characters greater than 255, Perl doesn't realise it
731        should be using Unicode semantics.
733    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
734        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
735        does in Unicode mode.
737    32. Added the "forbid" facility to pcretest so that putting tests into the
738        wrong test files can sometimes be quickly detected.
740    33. There is now a limit (default 250) on the depth of nesting of parentheses.
741        This limit is imposed to control the amount of system stack used at compile
742        time. It can be changed at build time by --with-parens-nest-limit=xxx or
743        the equivalent in CMake.
745    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
746        errors. Perl warns for these when in warning mode, but PCRE has no facility
747        for giving warnings.
749    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
750        However, this was not working for (?!) because it is optimized to (*FAIL),
751        for which PCRE does not allow quantifiers. The optimization is now disabled
752        when a quantifier follows (?!). I can't see any use for this, but it makes
753        things uniform.
755    36. Perl no longer allows group names to start with digits, so I have made this
756        change also in PCRE. It simplifies the code a bit.
758    37. In extended mode, Perl ignores spaces before a + that indicates a
759        possessive quantifier. PCRE allowed a space before the quantifier, but not
760        before the possessive +. It now does.
762    38. The use of \K (reset reported match start) within a repeated possessive
763        group such as (a\Kb)*+ was not working.
765    40. Document that the same character tables must be used at compile time and
766        run time, and that the facility to pass tables to pcre_exec() and
767        pcre_dfa_exec() is for use only with saved/restored patterns.
769    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
770        features for Builds with MSVC:
772        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
773           builds). The .rc files can be used to set FileDescription and many other
774           attributes.
776        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
777           This allows higher-level build scripts which want .pdb files to avoid
778           hard-coding the exact files needed."
780    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
781        mean "start of word" and "end of word", respectively, as a transition aid.
783    43. A minimizing repeat of a class containing codepoints greater than 255 in
784        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
785        compiled to use the heap for recursion.
787    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
788        is configured.
791    Version 8.33 28-May-2013
792    ------------------------
794    1.  Added 'U' to some constants that are compared to unsigned integers, to
795        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
796        variables that are added to signed variables, to ensure the result is
797        signed and can be negated.
799    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
800        CMake config files.
802    3.  Revise the creation of config.h.generic so that all boolean macros are
803        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
804        overriding via -D on the command line possible.
806    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
807        to unsigned int is reported to make a quite noticeable speed difference in
808        a specific Windows environment. Testing on Linux did also appear to show
809        some benefit (and it is clearly not harmful). Also fixed the definition of
810        Xop which should be unsigned.
812    5.  Related to (4), changing the definition of the intermediate variable cc
813        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
814        improvements.
816    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
817        unnecessary spaces.
819    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
820        and later.
822    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
824    9.  Optimizing fast_forward_start_bits in JIT.
826    10. Adding support for callouts in JIT, and fixing some issues revealed
827        during this work. Namely:
829        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
831        (b) Minimum length was not checked before the matching is started.
833    11. The value of capture_last that is passed to callouts was incorrect in some
834        cases when there was a capture on one path that was subsequently abandoned
835        after a backtrack. Also, the capture_last value is now reset after a
836        recursion, since all captures are also reset in this case.
838    12. The interpreter no longer returns the "too many substrings" error in the
839        case when an overflowing capture is in a branch that is subsequently
840        abandoned after a backtrack.
842    13. In the pathological case when an offset vector of size 2 is used, pcretest
843        now prints out the matched string after a yield of 0 or 1.
845    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
846        Only supported by the JIT compiler at the moment.
848    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
850    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
851        offset of the starting point of the matching process, provided the offsets
852        vector is large enough.
854    17. The \A escape now records a lookbehind value of 1, though its execution
855        does not actually inspect the previous character. This is to ensure that,
856        in partial multi-segment matching, at least one character from the old
857        segment is retained when a new segment is processed. Otherwise, if there
858        are no lookbehinds in the pattern, \A might match incorrectly at the start
859        of a new segment.
861    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
863    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
864        gives some modest performance improvement in 8-bit mode.
866    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
867        be expressed in certain programming languages using Universal Character
868        Names.
870    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
871        which points out that "non characters" are not "characters that may not
872        appear in Unicode strings" but rather "characters that are reserved for
873        internal use and have only local meaning".
875    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
876        there was a conditional group that depended on an assertion, if the
877        assertion was false, the callout that immediately followed the alternation
878        in the condition was skipped when pcre_exec() was used for matching.
880    23. Allow an explicit callout to be inserted before an assertion that is the
881        condition for a conditional group, for compatibility with automatic
882        callouts, which always insert a callout at this point.
884    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
885        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
887    25. (*PRUNE) is now supported by the JIT compiler.
889    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
891    27. Fix the case where there are two or more SKIPs with arguments that may be
892        ignored.
894    28. (*SKIP) is now supported by the JIT compiler.
896    29. (*THEN) is now supported by the JIT compiler.
898    30. Update RunTest with additional test selector options.
900    31. The way PCRE handles backtracking verbs has been changed in two ways.
902        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
903        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
904        backtracking. In some cases this makes it more Perl-compatible, but Perl's
905        rather obscure rules do not always do the same thing.
907        (2) Previously, backtracking verbs were confined within assertions. This is
908        no longer the case for positive assertions, except for (*ACCEPT). Again,
909        this sometimes improves Perl compatibility, and sometimes does not.
911    32. A number of tests that were in test 2 because Perl did things differently
912        have been moved to test 1, because either Perl or PCRE has changed, and
913        these tests are now compatible.
915    32. Backtracking control verbs are now handled in the same way in JIT and
916        interpreter.
918    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
919        contained a forward subroutine reference caused a compile error.
921    34. Auto-detect and optimize limited repetitions in JIT.
923    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
924        blocking (*UTF) etc.
926    36. In the interpreter, maximizing pattern repetitions for characters and
927        character types now use tail recursion, which reduces stack usage.
929    37. The value of the max lookbehind was not correctly preserved if a compiled
930        and saved regex was reloaded on a host of different endianness.
932    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
933        of the compiled pattern block, expand the flags field from 16 to 32 bits
934        because it was almost full.
936    39. Try madvise first before posix_madvise.
938    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
939        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
940        original change locked out all matches of empty strings. This has been
941        changed so that one match of an empty string per line is recognized.
942        Subsequent searches on the same line (for colouring or for --only-matching,
943        for example) do not recognize empty strings.
945    41. Applied a user patch to fix a number of spelling mistakes in comments.
947    42. Data lines longer than 65536 caused pcretest to crash.
949    43. Clarified the data type for length and startoffset arguments for pcre_exec
950        and pcre_dfa_exec in the function-specific man pages, where they were
951        explicitly stated to be in bytes, never having been updated. I also added
952        some clarification to the pcreapi man page.
954    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
955        a segmentation fault.
958    Version 8.32 30-November-2012
959    -----------------------------
961    1.  Improved JIT compiler optimizations for first character search and single
962        character iterators.
964    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
965        Patch by Daniel Richard G.
967    3.  Single character iterator optimizations in the JIT compiler.
969    4.  Improved JIT compiler optimizations for character ranges.
971    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
972        Reported by Giuseppe D'Angelo.
974    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
975        of a line, was being set incorrectly in cases where .* appeared inside
976        atomic brackets at the start of a pattern, or where there was a subsequent
977        *PRUNE or *SKIP.
979    7.  Improved instruction cache flush for POWER/PowerPC.
980        Patch by Daniel Richard G.
982    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
983        grep:
985        (a) There is now no limit to the number of patterns to be matched.
987        (b) An error is given if a pattern is too long.
989        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
990            are now supported.
992        (d) --exclude-from and --include-from (multiple use) have been added.
994        (e) Exclusions and inclusions now apply to all files and directories, not
995            just to those obtained from scanning a directory recursively.
997        (f) Multiple uses of -f and --file-list are now supported.
999        (g) In a Windows environment, the default for -d has been changed from
1000            "read" (the GNU grep default) to "skip", because otherwise the presence
1001            of a directory in the file list provokes an error.
1003        (h) The documentation has been revised and clarified in places.
1005    9.  Improve the matching speed of capturing brackets.
1007    10. Changed the meaning of \X so that it now matches a Unicode extended
1008        grapheme cluster.
1010    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
1011        out POSIX threads when JIT support is configured.
1013    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
1015    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
1016        structure could go wrong in environments where size_t is not the same size
1017        as int.
1019    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
1020        set.
1022    15. The EBCDIC support had decayed; later updates to the code had included
1023        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
1024        general tidy up of EBCDIC-related issues, and the documentation was also
1025        not quite right. There is now a test that can be run on ASCII systems to
1026        check some of the EBCDIC-related things (but is it not a full test).
1028    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
1029        in a small tidy to the code.
1031    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
1033    18. If the --only-matching (-o) option in pcregrep is specified multiple
1034        times, each one causes appropriate output. For example, -o1 -o2 outputs the
1035        substrings matched by the 1st and 2nd capturing parentheses. A separating
1036        string can be specified by --om-separator (default empty).
1038    19. Improving the first n character searches.
1040    20. Turn case lists for horizontal and vertical white space into macros so that
1041        they are defined only once.
1043    21. This set of changes together give more compatible Unicode case-folding
1044        behaviour for characters that have more than one other case when UCP
1045        support is available.
1047        (a) The Unicode property table now has offsets into a new table of sets of
1048            three or more characters that are case-equivalent. The MultiStage2.py
1049            script that generates these tables (the pcre_ucd.c file) now scans
1050            CaseFolding.txt instead of UnicodeData.txt for character case
1051            information.
1053        (b) The code for adding characters or ranges of characters to a character
1054            class has been abstracted into a generalized function that also handles
1055            case-independence. In UTF-mode with UCP support, this uses the new data
1056            to handle characters with more than one other case.
1058        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
1059            whose other case is greater than 256 are now correctly matched
1060            caselessly. Previously, the high codepoint matched the low one, but not
1061            vice versa.
1063        (d) The processing of \h, \H, \v, and \ in character classes now makes use
1064            of the new class addition function, using character lists defined as
1065            macros alongside the case definitions of 20 above.
1067        (e) Caseless back references now work with characters that have more than
1068            one other case.
1070        (f) General caseless matching of characters with more than one other case
1071            is supported.
1073    22. Unicode character properties were updated from Unicode 6.2.0
1075    23. Improved CMake support under Windows. Patch by Daniel Richard G.
1077    24. Add support for 32-bit character strings, and UTF-32
1079    25. Major JIT compiler update (code refactoring and bugfixing).
1080        Experimental Sparc 32 support is added.
1082    26. Applied a modified version of Daniel Richard G's patch to create
1083        pcre.h.generic and config.h.generic by "make" instead of in the
1084        PrepareRelease script.
1086    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
1087        pcre_compile.c when checking for a zero character.
1089    28. Introducing a native interface for JIT. Through this interface, the compiled
1090        machine code can be directly executed. The purpose of this interface is to
1091        provide fast pattern matching, so several sanity checks are not performed.
1092        However, feature tests are still performed. The new interface provides
1093        1.4x speedup compared to the old one.
1095    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
1096        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
1097        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
1099    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
1100        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
1101        the "old" RFC 2279). Instead, it ended up passing a negative length to
1102        pcre_exec().
1104    31. Add support for GCC's visibility feature to hide internal functions.
1106    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
1107        "unknown -C option" after outputting 0 or 1.
1109    33. There is now support for generating a code coverage report for the test
1110        suite in environments where gcc is the compiler and lcov is installed. This
1111        is mainly for the benefit of the developers.
1113    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
1114        unaddressable using valgrind annotations, allowing valgrind to detect
1115        invalid memory accesses. This is mainly for the benefit of the developers.
1117    25. (*UTF) can now be used to start a pattern in any of the three libraries.
1119    26. Give configure error if --enable-cpp but no C++ compiler found.
1122    Version 8.31 06-July-2012
1123    -------------------------
1125    1.  Fixing a wrong JIT test case and some compiler warnings.
1127    2.  Removed a bashism from the RunTest script.
1129    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
1130        to unsigned type, result still unsigned" that was given by an MS compiler
1131        on encountering the code "-sizeof(xxx)".
1133    4.  Partial matching support is added to the JIT compiler.
1135    5.  Fixed several bugs concerned with partial matching of items that consist
1136        of more than one character:
1138        (a) /^(..)\1/ did not partially match "aba" because checking references was
1139            done on an "all or nothing" basis. This also applied to repeated
1140            references.
1142        (b) \R did not give a hard partial match if \r was found at the end of the
1143            subject.
1145        (c) \X did not give a hard partial match after matching one or more
1146            characters at the end of the subject.
1148        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
1149            a partial match for the string "\r".
1151        (e) When newline was set to CRLF, the metacharacter "." did not recognize
1152            a partial match for a CR character at the end of the subject string.
1154    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
1155        running pcretest, the text "(JIT)" added to the output whenever JIT is
1156        actually used to run the match.
1158    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
1159        or /S+[+] with a digit between 1 and 7.
1161    8.  OP_NOT now supports any UTF character not just single-byte ones.
1163    9.  (*MARK) control verb is now supported by the JIT compiler.
1165    10. The command "./RunTest list" lists the available tests without actually
1166        running any of them. (Because I keep forgetting what they all are.)
1170    12. Applied a (slightly modified) user-supplied patch that improves performance
1171        when the heap is used for recursion (compiled with --disable-stack-for-
1172        recursion). Instead of malloc and free for each heap frame each time a
1173        logical recursion happens, frames are retained on a chain and re-used where
1174        possible. This sometimes gives as much as 30% improvement.
1176    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
1177        call.
1179    14. As documented, (*COMMIT) is now confined to within a positive assertion.
1181    15. It is now possible to link pcretest with libedit as an alternative to
1182        libreadline.
1184    16. (*COMMIT) control verb is now supported by the JIT compiler.
1186    17. The Unicode data tables have been updated to Unicode 6.1.0.
1188    18. Added --file-list option to pcregrep.
1190    19. Added binary file support to pcregrep, including the -a, --binary-files,
1191        -I, and --text options.
1193    20. The madvise function is renamed for posix_madvise for QNX compatibility
1194        reasons. Fixed by Giuseppe D'Angelo.
1196    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
1198    22. Changed the option for creating symbolic links for 16-bit man pages from
1199        -s to -sf so that re-installing does not cause issues.
1201    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
1203    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
1204        matches in certain environments (the workspace was not being correctly
1205        retained). Also added to pcre_dfa_exec() a simple plausibility check on
1206        some of the workspace data at the beginning of a restart.
1208    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
1209        was not doing so when it should - probably a typo introduced by SVN 528
1210        (change 8.10/14).
1212    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
1213        \w+ when the character tables indicated that \x{c4} was a word character.
1214        There were several related cases, all because the tests for doing a table
1215        lookup were testing for characters less than 127 instead of 255.
1217    27. If a pattern contains capturing parentheses that are not used in a match,
1218        their slots in the ovector are set to -1. For those that are higher than
1219        any matched groups, this happens at the end of processing. In the case when
1220        there were back references that the ovector was too small to contain
1221        (causing temporary malloc'd memory to be used during matching), and the
1222        highest capturing number was not used, memory off the end of the ovector
1223        was incorrectly being set to -1. (It was using the size of the temporary
1224        memory instead of the true size.)
1226    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
1227        ovector size, it uses memory at the end of the block that it has got.
1229    29. Check for an overlong MARK name and give an error at compile time. The
1230        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
1232    30. JIT compiler update.
1234    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
1235        Rill for the patch.
1237    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
1239    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
1241    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
1242        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
1243        was enabled.
1245    35. Improve JIT code generation for greedy plus quantifier.
1247    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
1248        1 to "aa" instead of to an empty string. The bug affected repeated groups
1249        that could potentially match an empty string.
1251    37. Optimizing single character iterators in JIT.
1253    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
1254        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
1255        codepoints that are too big for the mode are faulted, and in a UTF mode,
1256        disallowed codepoints are also faulted.
1258    39. If PCRE was compiled with UTF support, in three places in the DFA
1259        matcher there was code that should only have been obeyed in UTF mode, but
1260        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
1261        processing when bytes with values greater than 127 were present. In 16-bit
1262        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
1263        both cases the values are those that cannot be the first data item in a UTF
1264        character. The three items that might have provoked this were recursions,
1265        possessively repeated groups, and atomic groups.
1267    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
1268        and pcregrep, because some OS require shared objects to be explicitly
1269        passed to ld, causing the link step to fail if they are not.
1271    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
1272        mode, patterns that started with \h* or \R* might be incorrectly matched.
1275    Version 8.30 04-February-2012
1276    -----------------------------
1278    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
1279        name is defined in ctype.h.
1281    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
1282        only in quite long subpatterns.
1284    3.  Removed the function pcre_info(), which has been obsolete and deprecated
1285        since it was replaced by pcre_fullinfo() in February 2000.
1287    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
1288        match a (*MARK), and the match failed at the start of the subject, a
1289        reference to memory before the start of the subject could occur. This bug
1290        was introduced by fix 17 of release 8.21.
1292    5.  A reference to an unset group with zero minimum repetition was giving
1293        totally wrong answers (in non-JavaScript-compatibility mode). For example,
1294        /(another)?(\1?)test/ matched against "hello world test". This bug was
1295        introduced in release 8.13.
1297    6.  Add support for 16-bit character strings (a large amount of work involving
1298        many changes and refactorings).
1300    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
1301        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
1302        from a file.
1304    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
1305        rounding is not applied in this particular case).
1307    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
1308        if they appear, or are escaped, in patterns.
1310    10. Get rid of a number of -Wunused-but-set-variable warnings.
1312    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
1313        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
1314        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
1315        also returns the mark "x". This bug applied to capturing parentheses,
1316        non-capturing parentheses, and atomic parentheses. It also applied to some
1317        assertions.
1319    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
1320        information out of configure.ac instead of relying on pcre.h.generic, which
1321        is not stored in the repository.
1323    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
1324        -lreadline.
1326    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
1328    15. Applied Graycode's patch to put the top-level frame on the stack rather
1329        than the heap when not using the stack for recursion. This gives a
1330        performance improvement in many cases when recursion is not deep.
1332    16. Experimental code added to "pcretest -C" to output the stack frame size.
1335    Version 8.21 12-Dec-2011
1336    ------------------------
1338    1.  Updating the JIT compiler.
1340    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
1341        are added as well.
1343    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
1344        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
1345        calling _pcre_jit_exec. Some extra comments are added.
1347    4.  (*MARK) settings inside atomic groups that do not contain any capturing
1348        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
1349        was introduced by change 18 for 8.20.
1351    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
1352        ECMA-262 standard.
1354    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
1355        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
1356        This bug was probably introduced by change 9 of 8.13.
1358    7.  While fixing 6 above, I noticed that a number of other items were being
1359        incorrectly rejected as "not fixed length". This arose partly because newer
1360        opcodes had not been added to the fixed-length checking code. I have (a)
1361        corrected the bug and added tests for these items, and (b) arranged for an
1362        error to occur if an unknown opcode is encountered while checking for fixed
1363        length instead of just assuming "not fixed length". The items that were
1364        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
1365        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
1366        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
1368    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
1369        being incorrectly compiled and would have given unpredicatble results.
1371    9.  A possessively repeated subpattern with minimum repeat count greater than
1372        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
1373        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
1374        the first (A) could occur when it should not.
1376    10. Add a cast and remove a redundant test from the code.
1378    11. JIT should use pcre_malloc/pcre_free for allocation.
1380    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
1381        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
1382        is anything other than /usr, -L is still shown).
1384    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
1386    14. Perl does not support \N without a following name in a [] class; PCRE now
1387        also gives an error.
1389    15. If a forward reference was repeated with an upper limit of around 2000,
1390        it caused the error "internal error: overran compiling workspace". The
1391        maximum number of forward references (including repeats) was limited by the
1392        internal workspace, and dependent on the LINK_SIZE. The code has been
1393        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
1394        the default depends on LINK_SIZE. There is a new upper limit (for safety)
1395        of around 200,000 forward references. While doing this, I also speeded up
1396        the filling in of repeated forward references.
1398    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
1399        incorrectly expecting the subject to contain another "a" after the start.
1401    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
1402        in the match, the SKIP should be ignored. This was not happening; instead
1403        the SKIP was being treated as NOMATCH. For patterns such as
1404        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
1405        tested.
1407    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
1408        now much more compatible with Perl, in particular in cases where the result
1409        is a non-match for a non-anchored pattern. For example, if
1410        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
1411        "m", where previously it did not return a name. A side effect of this
1412        change is that for partial matches, the last encountered mark name is
1413        returned, as for non matches. A number of tests that were previously not
1414        Perl-compatible have been moved into the Perl-compatible test files. The
1415        refactoring has had the pleasing side effect of removing one argument from
1416        the match() function, thus reducing its stack requirements.
1418    19. If the /S+ option was used in pcretest to study a pattern using JIT,
1419        subsequent uses of /S (without +) incorrectly behaved like /S+.
1421    21. Retrieve executable code size support for the JIT compiler and fixing
1422        some warnings.
1424    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
1425        not work when the shorter character appeared right at the end of the
1426        subject string.
1428    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
1429        systems.
1431    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
1432        output it when the /M option is used in pcretest.
1434    25. The CheckMan script was not being included in the distribution. Also, added
1435        an explicit "perl" to run Perl scripts from the PrepareRelease script
1436        because this is reportedly needed in Windows.
1438    26. If study data was being save in a file and studying had not found a set of
1439        "starts with" bytes for the pattern, the data written to the file (though
1440        never used) was taken from uninitialized memory and so caused valgrind to
1441        complain.
1443    27. Updated RunTest.bat as provided by Sheri Pierce.
1445    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
1447    29. Computation of memory usage for the table of capturing group names was
1448        giving an unnecessarily large value.
1451    Version 8.20 21-Oct-2011
1452    ------------------------
1454    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
1455        a POSIX class. After further experiments with Perl, which convinced me that
1456        Perl has bugs and confusions, a closing square bracket is no longer allowed
1457        in a POSIX name. This bug also affected patterns with classes that started
1458        with full stops.
1460    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
1461        captured substring, but while checking the failing first alternative,
1462        substring 1 is temporarily captured. If the output vector supplied to
1463        pcre_exec() was not big enough for this capture, the yield of the function
1464        was still zero ("insufficient space for captured substrings"). This cannot
1465        be totally fixed without adding another stack variable, which seems a lot
1466        of expense for a edge case. However, I have improved the situation in cases
1467        such as /(a)(b)x|abc/ matched against "abc", where the return code
1468        indicates that fewer than the maximum number of slots in the ovector have
1469        been set.
1471    3.  Related to (2) above: when there are more back references in a pattern than
1472        slots in the output vector, pcre_exec() uses temporary memory during
1473        matching, and copies in the captures as far as possible afterwards. It was
1474        using the entire output vector, but this conflicts with the specification
1475        that only 2/3 is used for passing back captured substrings. Now it uses
1476        only the first 2/3, for compatibility. This is, of course, another edge
1477        case.
1479    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
1480        main code base, and can be used by building with --enable-jit. When this is
1481        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
1482        runtime --no-jit option is given.
1484    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
1485        ovector, the return from the function was zero, implying that there were
1486        other matches that did not fit. The correct "exactly full" value is now
1487        returned.
1489    6.  If a subpattern that was called recursively or as a subroutine contained
1490        (*PRUNE) or any other control that caused it to give a non-standard return,
1491        invalid errors such as "Error -26 (nested recursion at the same subject
1492        position)" or even infinite loops could occur.
1494    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
1495        computing the minimum length on reaching *ACCEPT, and so ended up with the
1496        wrong value of 1 rather than 0. Further investigation indicates that
1497        computing a minimum subject length in the presence of *ACCEPT is difficult
1498        (think back references, subroutine calls), and so I have changed the code
1499        so that no minimum is registered for a pattern that contains *ACCEPT.
1501    8.  If (*THEN) was present in the first (true) branch of a conditional group,
1502        it was not handled as intended. [But see 16 below.]
1504    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
1505        Sheri Pierce.
1507    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
1508        the first byte in a match must be "a".
1510    11. Change 17 for 8.13 increased the recursion depth for patterns like
1511        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
1512        pattern contains any instances of (*THEN). If it does not, the old
1513        optimizations are restored. It would be nice to do this on a per-group
1514        basis, but at the moment that is not feasible.
1516    12. In some environments, the output of pcretest -C is CRLF terminated. This
1517        broke RunTest's code that checks for the link size. A single white space
1518        character after the value is now allowed for.
1520    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
1521        For "fr", it uses the Windows-specific input and output files.
1523    14. If (*THEN) appeared in a group that was called recursively or as a
1524        subroutine, it did not work as intended. [But see next item.]
1526    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
1527        pattern fragments (but not containing any | characters). If A and B are
1528        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
1529        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
1530        D. In other words, Perl considers parentheses that do not contain any |
1531        characters to be part of a surrounding alternative, whereas PCRE was
1532        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
1533        differently. PCRE now behaves in the same way as Perl, except in the case
1534        of subroutine/recursion calls such as (?1) which have in any case always
1535        been different (but PCRE had them first :-).
1537    16. Related to 15 above: Perl does not treat the | in a conditional group as
1538        creating alternatives. Such a group is treated in the same way as an
1539        ordinary group without any | characters when processing (*THEN). PCRE has
1540        been changed to match Perl's behaviour.
1542    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
1543        RunGrepTest script failed.
1545    18. Change 22 for version 13 caused atomic groups to use more stack. This is
1546        inevitable for groups that contain captures, but it can lead to a lot of
1547        stack use in large patterns. The old behaviour has been restored for atomic
1548        groups that do not contain any capturing parentheses.
1550    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
1551        suppress the check for a minimum subject length at run time. (If it was
1552        given to pcre_exec() or pcre_dfa_exec() it did work.)
1554    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
1555        fail to work when decoding hex characters in data strings in EBCDIC
1556        environments.
1558    21. It appears that in at least one Mac OS environment, the isxdigit() function
1559        is implemented as a macro that evaluates to its argument more than once,
1560        contravening the C 90 Standard (I haven't checked a later standard). There
1561        was an instance in pcretest which caused it to go wrong when processing
1562        \x{...} escapes in subject strings. The has been rewritten to avoid using
1563        things like p++ in the argument of isxdigit().
1566    Version 8.13 16-Aug-2011
1567  ------------------------  ------------------------
1569  1.  The Unicode data tables have been updated to Unicode 6.0.0.  1.  The Unicode data tables have been updated to Unicode 6.0.0.
# Line 98  Version 8.13 02-Aug-2011 Line 1660  Version 8.13 02-Aug-2011
1660      tail recursion to cut down on stack usage. Unfortunately, now that there is      tail recursion to cut down on stack usage. Unfortunately, now that there is
1661      the possibility of (*THEN) occurring in these branches, tail recursion is      the possibility of (*THEN) occurring in these branches, tail recursion is
1662      no longer possible because the return has to be checked for (*THEN). These      no longer possible because the return has to be checked for (*THEN). These
1663      two optimizations have therefore been removed.      two optimizations have therefore been removed. [But see 8.20/11 above.]
1665  18. If a pattern containing \R was studied, it was assumed that \R always  18. If a pattern containing \R was studied, it was assumed that \R always
1666      matched two bytes, thus causing the minimum subject length to be      matched two bytes, thus causing the minimum subject length to be
# Line 189  Version 8.13 02-Aug-2011 Line 1751  Version 8.13 02-Aug-2011
1751      For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,      For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
1752      unescaped square brackets may also appear as part of class names. For      unescaped square brackets may also appear as part of class names. For
1753      example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves      example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
1754      more like Perl.      more like Perl. (But see 8.20/1 above.)
1756  38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this  38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
1757      was because it thought it was \N{name}, which is not supported).      was because it thought it was \N{name}, which is not supported).
# Line 224  Version 8.13 02-Aug-2011 Line 1786  Version 8.13 02-Aug-2011
1786      (a) The default value of the buffer size parameter has been increased from      (a) The default value of the buffer size parameter has been increased from
1787          8K to 20K. (The actual buffer used is three times this size.)          8K to 20K. (The actual buffer used is three times this size.)
1789      (b) The default can be changed by ./configure --with-pcregrep-bufsiz when      (b) The default can be changed by ./configure --with-pcregrep-bufsize when
1790          PCRE is built.          PCRE is built.
1792      (c) A --buffer-size=n option has been added to pcregrep, to allow the size      (c) A --buffer-size=n option has been added to pcregrep, to allow the size
# Line 245  Version 8.13 02-Aug-2011 Line 1807  Version 8.13 02-Aug-2011
1807  47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a  47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
1808      complete match instead of a partial match. This bug was dependent on both      complete match instead of a partial match. This bug was dependent on both
1809      the PCRE_UTF8 and PCRE_DOTALL options being set.      the PCRE_UTF8 and PCRE_DOTALL options being set.
1811  48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the  48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
1812      starting byte set, because \b was not being ignored.      starting byte set, because \b was not being ignored.
1815  Version 8.12 15-Jan-2011  Version 8.12 15-Jan-2011
# Line 900  Version 7.9 11-Apr-09 Line 2462  Version 7.9 11-Apr-09
2462  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
2463      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
2464      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
2465      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
2466        8.33.]
2468  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
2469      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1143  Version 7.7 07-May-08 Line 2706  Version 7.7 07-May-08
2706      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2707      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2708      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2709      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2710      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2711      was subsequently set up correctly.)      was subsequently set up correctly.)

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