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revision 274 by ph10, Tue Nov 20 10:05:23 2007 UTC revision 411 by ph10, Fri Apr 10 15:40:21 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.5 12-Nov-07  Version 7.9 10-Apr-09
5    ---------------------
6    
7    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
8        (pcretest), all targets were linked against these libraries. This included
9        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
10        libraries. This caused unwanted dependencies to be created. This problem
11        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
12        pcretest is linked with readline.
13    
14    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
15        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
16        moved outside it again, because FALSE and TRUE are already defined in AIX,
17        but BOOL is not.
18    
19    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
20        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
21    
22    4.  The pcregrep documentation said spaces were inserted as well as colons (or
23        hyphens) following file names and line numbers when outputting matching
24        lines. This is not true; no spaces are inserted. I have also clarified the
25        wording for the --colour (or --color) option.
26    
27    5.  In pcregrep, when --colour was used with -o, the list of matching strings
28        was not coloured; this is different to GNU grep, so I have changed it to be
29        the same.
30    
31    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
32        each matching line was coloured. Now it goes on to look for further matches
33        of any of the test patterns, which is the same behaviour as GNU grep.
34    
35    7.  A pattern that could match an empty string could cause pcregrep to loop; it
36        doesn't make sense to accept an empty string match in pcregrep, so I have
37        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
38        seems to be how GNU grep behaves.
39    
40    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
41        start or after a newline", because the conditional assertion was not being
42        correctly handled. The rule now is that both the assertion and what follows
43        in the first alternative must satisfy the test.
44    
45    9.  If auto-callout was enabled in a pattern with a conditional group whose
46        condition was an assertion, PCRE could crash during matching, both with
47        pcre_exec() and pcre_dfa_exec().
48    
49    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
50        used for matching.
51    
52    11. Unicode property support in character classes was not working for
53        characters (bytes) greater than 127 when not in UTF-8 mode.
54    
55    12. Added the -M command line option to pcretest.
56    
57    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
58    
59    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
60    
61    16. Added comments and documentation about mis-use of no_arg in the C++
62        wrapper.
63    
64    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
65        from Martin Jerabek that uses macro names for all relevant character and
66        string constants.
67    
68    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
69        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
70        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
71        these, but not everybody uses configure.
72    
73    19. A conditional group that had only one branch was not being correctly
74        recognized as an item that could match an empty string. This meant that an
75        enclosing group might also not be so recognized, causing infinite looping
76        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
77        with the subject "ab", where knowledge that the repeated group can match
78        nothing is needed in order to break the loop.
79    
80    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
81        exec(), but without supplying a callout function, matching went wrong.
82    
83    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
84        leak if the size of the offset vector was greater than 30. When the vector
85        is smaller, the saved offsets during recursion go onto a local stack
86        vector, but for larger vectors malloc() is used. It was failing to free
87        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
88        error, in fact).
89    
90    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
91        heapframe that is used only when UTF-8 support is enabled. This caused no
92        problem, but was untidy.
93    
94    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
95        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
96        included within another project.
97    
98    24. Steven Van Ingelgem's patches to add more options to the CMake support,
99        slightly modified by me:
100    
101          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
102              not building pcregrep.
103    
104          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
105              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
106    
107    25. Forward references, both numeric and by name, in patterns that made use of
108        duplicate group numbers, could behave incorrectly or give incorrect errors,
109        because when scanning forward to find the reference group, PCRE was not
110        taking into account the duplicate group numbers. A pattern such as
111        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
112    
113    26. Changed a few more instances of "const unsigned char *" to USPTR, making
114        the feature of a custom pointer more persuasive (as requested by a user).
115    
116    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
117        pcretest.c, inside #ifndefs, because it seems they are sometimes already
118        pre-defined.
119    
120    
121    
122    Version 7.8 05-Sep-08
123    ---------------------
124    
125    1.  Replaced UCP searching code with optimized version as implemented for Ad
126        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
127        stage table and inline lookup instead of a function, giving speed ups of 2
128        to 5 times on some simple patterns that I tested. Permission was given to
129        distribute the MultiStage2.py script that generates the tables (it's not in
130        the tarball, but is in the Subversion repository).
131    
132    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
133        scripts.
134    
135    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
136        a group with a zero qualifier. The result of the study could be incorrect,
137        or the function might crash, depending on the pattern.
138    
139    4.  Caseless matching was not working for non-ASCII characters in back
140        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
141        It now works when Unicode Property Support is available.
142    
143    5.  In pcretest, an escape such as \x{de} in the data was always generating
144        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
145        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
146        truncation.
147    
148    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
149    
150    7.  Added two (int) casts to pcregrep when printing the difference of two
151        pointers, in case they are 64-bit values.
152    
153    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
154        test 2 if it fails.
155    
156    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
157        and a #define of that name to empty if it is not externally set. This is to
158        allow users of MSVC to set it if necessary.
159    
160    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
161        the convenience functions in the pcre_get.c source file.
162    
163    11. An option change at the start of a pattern that had top-level alternatives
164        could cause overwriting and/or a crash. This command provoked a crash in
165        some environments:
166    
167          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
168    
169        This potential security problem was recorded as CVE-2008-2371.
170    
171    12. For a pattern where the match had to start at the beginning or immediately
172        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
173        pcre_dfa_exec() could read past the end of the passed subject if there was
174        no match. To help with detecting such bugs (e.g. with valgrind), I modified
175        pcretest so that it places the subject at the end of its malloc-ed buffer.
176    
177    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
178        exec() might read past the end of the data buffer in UTF-8 mode.
179    
180    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
181        the data contained the byte 0x85 as part of a UTF-8 character within its
182        first line. This applied both to normal and DFA matching.
183    
184    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
185        /^[^d]*?$/8 failed to match "abc".
186    
187    16. Added a missing copyright notice to pcrecpp_internal.h.
188    
189    17. Make it more clear in the documentation that values returned from
190        pcre_exec() in ovector are byte offsets, not character counts.
191    
192    18. Tidied a few places to stop certain compilers from issuing warnings.
193    
194    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
195        supplied by Stefan Weber. I made a further small update for 7.8 because
196        there is a change of source arrangements: the pcre_searchfuncs.c module is
197        replaced by pcre_ucd.c.
198    
199    
200    Version 7.7 07-May-08
201    ---------------------
202    
203    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
204        a string to a long long, pretend we don't even have a long long." This is
205        done by checking for the strtoq, strtoll, and _strtoi64 functions.
206    
207    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
208        pre-7.6 versions, which defined a global no_arg variable instead of putting
209        it in the RE class. (See also #8 below.)
210    
211    3.  Remove a line of dead code, identified by coverity and reported by Nuno
212        Lopes.
213    
214    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
215    
216        (1) The include/exclude patterns were being applied to the whole pathnames
217            of files, instead of just to the final components.
218    
219        (2) If there was more than one level of directory, the subdirectories were
220            skipped unless they satisfied the include/exclude conditions. This is
221            inconsistent with GNU grep (and could even be seen as contrary to the
222            pcregrep specification - which I improved to make it absolutely clear).
223            The action now is always to scan all levels of directory, and just
224            apply the include/exclude patterns to regular files.
225    
226    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
227        --exclude_dir in the tests to avoid scanning .svn directories.
228    
229    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
230        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
231        doesn't support NULs in patterns.
232    
233    7.  Added some missing "const"s to declarations of static tables in
234        pcre_compile.c and pcre_dfa_exec.c.
235    
236    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
237        caused by fix #2  above. (Subsequently also a second patch to fix the
238        first patch. And a third patch - this was a messy problem.)
239    
240    9.  Applied Craig's patch to remove the use of push_back().
241    
242    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
243        matching function regexec().
244    
245    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
246        which, however, unlike Perl's \g{...}, are subroutine calls, not back
247        references. PCRE supports relative numbers with this syntax (I don't think
248        Oniguruma does).
249    
250    12. Previously, a group with a zero repeat such as (...){0} was completely
251        omitted from the compiled regex. However, this means that if the group
252        was called as a subroutine from elsewhere in the pattern, things went wrong
253        (an internal error was given). Such groups are now left in the compiled
254        pattern, with a new opcode that causes them to be skipped at execution
255        time.
256    
257    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
258        to the way PCRE behaves:
259    
260        (a) A lone ] character is dis-allowed (Perl treats it as data).
261    
262        (b) A back reference to an unmatched subpattern matches an empty string
263            (Perl fails the current match path).
264    
265        (c) A data ] in a character class must be notated as \] because if the
266            first data character in a class is ], it defines an empty class. (In
267            Perl it is not possible to have an empty class.) The empty class []
268            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
269            The negative empty class [^] matches any one character, independently
270            of the DOTALL setting.
271    
272    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
273        non-existent subpattern following a character class starting with ']' and
274        containing () gave an internal compiling error instead of "reference to
275        non-existent subpattern". Fortunately, when the pattern did exist, the
276        compiled code was correct. (When scanning forwards to check for the
277        existencd of the subpattern, it was treating the data ']' as terminating
278        the class, so got the count wrong. When actually compiling, the reference
279        was subsequently set up correctly.)
280    
281    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
282        it was being rejected as not supported by pcre_dfa_exec(), even though
283        other assertions are supported. I have made pcre_dfa_exec() support
284        (*FAIL).
285    
286    16. The implementation of 13c above involved the invention of a new opcode,
287        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
288        cannot be changed at match time, I realized I could make a small
289        improvement to matching performance by compiling OP_ALLANY instead of
290        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
291        on the OP_ANY path.
292    
293    17. Compiling pcretest on Windows with readline support failed without the
294        following two fixes: (1) Make the unistd.h include conditional on
295        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
296    
297    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
298        ncurses library to be included for pcretest when ReadLine support is
299        requested, but also to allow for it to be overridden. This patch came from
300        Daniel Bergström.
301    
302    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
303        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
304        any errors with the current Unicode tables. Thanks to Peter Kankowski for
305        spotting this.
306    
307    
308    Version 7.6 28-Jan-08
309    ---------------------
310    
311    1.  A character class containing a very large number of characters with
312        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
313        overflow.
314    
315    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
316        HAVE_LONG_LONG is not defined.
317    
318    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
319        bring them up to date and include new features. This patch includes:
320    
321        - Fixed PH's badly added libz and libbz2 support.
322        - Fixed a problem with static linking.
323        - Added pcredemo. [But later removed - see 7 below.]
324        - Fixed dftables problem and added an option.
325        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
326            HAVE_LONG_LONG.
327        - Added readline support for pcretest.
328        - Added an listing of the option settings after cmake has run.
329    
330    4.  A user submitted a patch to Makefile that makes it easy to create
331        "pcre.dll" under mingw when using Configure/Make. I added stuff to
332        Makefile.am that cause it to include this special target, without
333        affecting anything else. Note that the same mingw target plus all
334        the other distribution libraries and programs are now supported
335        when configuring with CMake (see 6 below) instead of with
336        Configure/Make.
337    
338    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
339        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
340        exported in the Windows port". It has not yet been confirmed that the patch
341        solves the problem, but it does no harm.
342    
343    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
344        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
345        with CMake, and also correct the comment about stack recursion.
346    
347    7.  Remove the automatic building of pcredemo from the ./configure system and
348        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
349        of a program that users should build themselves after PCRE is installed, so
350        building it automatically is not really right. What is more, it gave
351        trouble in some build environments.
352    
353    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
354    
355    
356    Version 7.5 10-Jan-08
357  ---------------------  ---------------------
358    
359  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
360      values in parens when parsing an RE using the C++ wrapper."      values in parens when parsing an RE using the C++ wrapper."
361    
362  2.  Negative specials like \S did not work in character classes in UTF-8 mode.  2.  Negative specials like \S did not work in character classes in UTF-8 mode.
363      Characters greater than 255 were excluded from the class instead of being      Characters greater than 255 were excluded from the class instead of being
364      included.      included.
365    
366  3.  The same bug as (2) above applied to negated POSIX classes such as  3.  The same bug as (2) above applied to negated POSIX classes such as
367      [:^space:].      [:^space:].
368    
369  4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it  4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
370      defined or documented. It seems to have been a typo for PCRE_STATIC, so      defined or documented. It seems to have been a typo for PCRE_STATIC, so
371      I have changed it.      I have changed it.
372    
373  5.  The construct (?&) was not diagnosed as a syntax error (it referenced the  5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
374      first named subpattern) and a construct such as (?&a) would reference the      first named subpattern) and a construct such as (?&a) would reference the
375      first named subpattern whose name started with "a" (in other words, the      first named subpattern whose name started with "a" (in other words, the
376      length check was missing). Both these problems are fixed. "Subpattern name      length check was missing). Both these problems are fixed. "Subpattern name
377      expected" is now given for (?&) (a zero-length name), and this patch also      expected" is now given for (?&) (a zero-length name), and this patch also
378      makes it give the same error for \k'' (previously it complained that that      makes it give the same error for \k'' (previously it complained that that
379      was a reference to a non-existent subpattern).      was a reference to a non-existent subpattern).
380    
381  6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;  6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
382      this is right because (?- can be followed by option settings as well as by      this is right because (?- can be followed by option settings as well as by
383      digits. I have, however, made the messages clearer.      digits. I have, however, made the messages clearer.
384    
385  7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns  7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
386      than the number used in the conditional) now cause a compile-time error.      than the number used in the conditional) now cause a compile-time error.
387      This is actually not compatible with Perl, which accepts such patterns, but      This is actually not compatible with Perl, which accepts such patterns, but
388      treats the conditional as always being FALSE (as PCRE used to), but it      treats the conditional as always being FALSE (as PCRE used to), but it
389      seems to me that giving a diagnostic is better.      seems to me that giving a diagnostic is better.
390    
391  8.  Change "alphameric" to the more common word "alphanumeric" in comments  8.  Change "alphameric" to the more common word "alphanumeric" in comments
392      and messages.      and messages.
393    
394    9.  Fix two occurrences of "backslash" in comments that should have been
395        "backspace".
396    
397    10. Remove two redundant lines of code that can never be obeyed (their function
398        was moved elsewhere).
399    
400    11. The program that makes PCRE's Unicode character property table had a bug
401        which caused it to generate incorrect table entries for sequences of
402        characters that have the same character type, but are in different scripts.
403        It amalgamated them into a single range, with the script of the first of
404        them. In other words, some characters were in the wrong script. There were
405        thirteen such cases, affecting characters in the following ranges:
406    
407          U+002b0 - U+002c1
408          U+0060c - U+0060d
409          U+0061e - U+00612
410          U+0064b - U+0065e
411          U+0074d - U+0076d
412          U+01800 - U+01805
413          U+01d00 - U+01d77
414          U+01d9b - U+01dbf
415          U+0200b - U+0200f
416          U+030fc - U+030fe
417          U+03260 - U+0327f
418          U+0fb46 - U+0fbb1
419          U+10450 - U+1049d
420    
421    12. The -o option (show only the matching part of a line) for pcregrep was not
422        compatible with GNU grep in that, if there was more than one match in a
423        line, it showed only the first of them. It now behaves in the same way as
424        GNU grep.
425    
426    13. If the -o and -v options were combined for pcregrep, it printed a blank
427        line for every non-matching line. GNU grep prints nothing, and pcregrep now
428        does the same. The return code can be used to tell if there were any
429        non-matching lines.
430    
431    14. Added --file-offsets and --line-offsets to pcregrep.
432    
433    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
434        infinitely looping recursion. The bug was that positive lookaheads were not
435        being skipped when checking for a possible empty match (negative lookaheads
436        and both kinds of lookbehind were skipped).
437    
438    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
439        inclusion of <windows.h> to before rather than after the definition of
440        INVALID_FILE_ATTRIBUTES (patch from David Byron).
441    
442    17. Specifying a possessive quantifier with a specific limit for a Unicode
443        character property caused pcre_compile() to compile bad code, which led at
444        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
445        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
446        caused the error; without that there was no problem.
447    
448    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
449    
450    19. Added --enable-pcretest-libreadline.
451    
452    20. In pcrecpp.cc, the variable 'count' was incremented twice in
453        RE::GlobalReplace(). As a result, the number of replacements returned was
454        double what it should be. I removed one of the increments, but Craig sent a
455        later patch that removed the other one (the right fix) and added unit tests
456        that check the return values (which was not done before).
457    
458    21. Several CMake things:
459    
460        (1) Arranged that, when cmake is used on Unix, the libraries end up with
461            the names libpcre and libpcreposix, not just pcre and pcreposix.
462    
463        (2) The above change means that pcretest and pcregrep are now correctly
464            linked with the newly-built libraries, not previously installed ones.
465    
466        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
467    
468    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
469        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
470        UTF-8 newline character). The key issue is that the pattern starts .*;
471        this means that the match must be either at the beginning, or after a
472        newline. The bug was in the code for advancing after a failed match and
473        checking that the new position followed a newline. It was not taking
474        account of UTF-8 characters correctly.
475    
476    23. PCRE was behaving differently from Perl in the way it recognized POSIX
477        character classes. PCRE was not treating the sequence [:...:] as a
478        character class unless the ... were all letters. Perl, however, seems to
479        allow any characters between [: and :], though of course it rejects as
480        unknown any "names" that contain non-letters, because all the known class
481        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
482        for example, whereas PCRE did not - it did not recognize a POSIX character
483        class. This seemed a bit dangerous, so the code has been changed to be
484        closer to Perl. The behaviour is not identical to Perl, because PCRE will
485        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
486        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
487        Perl does, and where it didn't before.
488    
489    24. Rewrite so as to remove the single use of %n from pcregrep because in some
490        Windows environments %n is disabled by default.
491    
492    
493  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07

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