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Load pcre-4.2 into code/trunk.

1 nigel 3 ChangeLog for PCRE
2     ------------------
4 nigel 67 Version 4.2 14-Apr-03
5     ---------------------
7     1. Typo "#if SUPPORT_UTF8" instead of "#ifdef SUPPORT_UTF8" fixed.
9     2. Changes to the building process, supplied by Ronald Landheer-Cieslak
10     [ON_WINDOWS]: new variable, "#" on non-Windows platforms
11     [NOT_ON_WINDOWS]: new variable, "#" on Windows platforms
12     [WIN_PREFIX]: new variable, "cyg" for Cygwin
13     * Makefile.in: use autoconf substitution for OBJEXT, EXEEXT, BUILD_OBJEXT
14     and BUILD_EXEEXT
15     Note: automatic setting of the BUILD variables is not yet working
16     set CPPFLAGS and BUILD_CPPFLAGS (but don't use yet) - should be used at
17     compile-time but not at link-time
18     [LINK]: use for linking executables only
19     make different versions for Windows and non-Windows
20     [LINKLIB]: new variable, copy of UNIX-style LINK, used for linking
21     libraries
22     [LINK_FOR_BUILD]: new variable
23     [OBJEXT]: use throughout
24     [EXEEXT]: use throughout
25     <winshared>: new target
26     <wininstall>: new target
27     <dftables.o>: use native compiler
28     <dftables>: use native linker
29     <install>: handle Windows platform correctly
30     <clean>: ditto
31     <check>: ditto
32     copy DLL to top builddir before testing
34     As part of these changes, -no-undefined was removed again. This was reported
35     to give trouble on HP-UX 11.0, so getting rid of it seems like a good idea
36     in any case.
38     3. Some tidies to get rid of compiler warnings:
40     . In the match_data structure, match_limit was an unsigned long int, whereas
41     match_call_count was an int. I've made them both unsigned long ints.
43     . In pcretest the fact that a const uschar * doesn't automatically cast to
44     a void * provoked a warning.
46     . Turning on some more compiler warnings threw up some "shadow" variables
47     and a few more missing casts.
49     4. If PCRE was complied with UTF-8 support, but called without the PCRE_UTF8
50     option, a class that contained a single character with a value between 128
51     and 255 (e.g. /[\xFF]/) caused PCRE to crash.
53     5. If PCRE was compiled with UTF-8 support, but called without the PCRE_UTF8
54     option, a class that contained several characters, but with at least one
55     whose value was between 128 and 255 caused PCRE to crash.
58 nigel 65 Version 4.1 12-Mar-03
59     ---------------------
60 nigel 63
61 nigel 65 1. Compiling with gcc -pedantic found a couple of places where casts were
62     needed, and a string in dftables.c that was longer than standard compilers are
63     required to support.
65     2. Compiling with Sun's compiler found a few more places where the code could
66     be tidied up in order to avoid warnings.
68     3. The variables for cross-compiling were called HOST_CC and HOST_CFLAGS; the
69     first of these names is deprecated in the latest Autoconf in favour of the name
70     CC_FOR_BUILD, because "host" is typically used to mean the system on which the
71     compiled code will be run. I can't find a reference for HOST_CFLAGS, but by
72     analogy I have changed it to CFLAGS_FOR_BUILD.
74     4. Added -no-undefined to the linking command in the Makefile, because this is
75     apparently helpful for Windows. To make it work, also added "-L. -lpcre" to the
76     linking step for the pcreposix library.
78     5. PCRE was failing to diagnose the case of two named groups with the same
79     name.
81     6. A problem with one of PCRE's optimizations was discovered. PCRE remembers a
82     literal character that is needed in the subject for a match, and scans along to
83     ensure that it is present before embarking on the full matching process. This
84     saves time in cases of nested unlimited repeats that are never going to match.
85     Problem: the scan can take a lot of time if the subject is very long (e.g.
86     megabytes), thus penalizing straightforward matches. It is now done only if the
87     amount of subject to be scanned is less than 1000 bytes.
89     7. A lesser problem with the same optimization is that it was recording the
90     first character of an anchored pattern as "needed", thus provoking a search
91     right along the subject, even when the first match of the pattern was going to
92     fail. The "needed" character is now not set for anchored patterns, unless it
93     follows something in the pattern that is of non-fixed length. Thus, it still
94     fulfils its original purpose of finding quick non-matches in cases of nested
95     unlimited repeats, but isn't used for simple anchored patterns such as /^abc/.
98     Version 4.0 17-Feb-03
99     ---------------------
101 nigel 63 1. If a comment in an extended regex that started immediately after a meta-item
102     extended to the end of string, PCRE compiled incorrect data. This could lead to
103     all kinds of weird effects. Example: /#/ was bad; /()#/ was bad; /a#/ was not.
105     2. Moved to autoconf 2.53 and libtool 1.4.2.
107     3. Perl 5.8 no longer needs "use utf8" for doing UTF-8 things. Consequently,
108     the special perltest8 script is no longer needed - all the tests can be run
109     from a single perltest script.
111     4. From 5.004, Perl has not included the VT character (0x0b) in the set defined
112     by \s. It has now been removed in PCRE. This means it isn't recognized as
113     whitespace in /x regexes too, which is the same as Perl. Note that the POSIX
114     class [:space:] *does* include VT, thereby creating a mess.
116     5. Added the class [:blank:] (a GNU extension from Perl 5.8) to match only
117     space and tab.
119     6. Perl 5.005 was a long time ago. It's time to amalgamate the tests that use
120     its new features into the main test script, reducing the number of scripts.
122     7. Perl 5.8 has changed the meaning of patterns like /a(?i)b/. Earlier versions
123     were backward compatible, and made the (?i) apply to the whole pattern, as if
124     /i were given. Now it behaves more logically, and applies the option setting
125     only to what follows. PCRE has been changed to follow suit. However, if it
126     finds options settings right at the start of the pattern, it extracts them into
127     the global options, as before. Thus, they show up in the info data.
129     8. Added support for the \Q...\E escape sequence. Characters in between are
130     treated as literals. This is slightly different from Perl in that $ and @ are
131     also handled as literals inside the quotes. In Perl, they will cause variable
132     interpolation. Note the following examples:
134     Pattern PCRE matches Perl matches
136     \Qabc$xyz\E abc$xyz abc followed by the contents of $xyz
137     \Qabc\$xyz\E abc\$xyz abc\$xyz
138     \Qabc\E\$\Qxyz\E abc$xyz abc$xyz
140     For compatibility with Perl, \Q...\E sequences are recognized inside character
141     classes as well as outside them.
143     9. Re-organized 3 code statements in pcretest to avoid "overflow in
144     floating-point constant arithmetic" warnings from a Microsoft compiler. Added a
145     (size_t) cast to one statement in pcretest and one in pcreposix to avoid
146     signed/unsigned warnings.
148     10. SunOS4 doesn't have strtoul(). This was used only for unpicking the -o
149     option for pcretest, so I've replaced it by a simple function that does just
150     that job.
152     11. pcregrep was ending with code 0 instead of 2 for the commands "pcregrep" or
153     "pcregrep -".
155     12. Added "possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's
156     Java package. This provides some syntactic sugar for simple cases of what my
157     documentation calls "once-only subpatterns". A pattern such as x*+ is the same
158     as (?>x*). In other words, if what is inside (?>...) is just a single repeated
159     item, you can use this simplified notation. Note that only makes sense with
160     greedy quantifiers. Consequently, the use of the possessive quantifier forces
161     greediness, whatever the setting of the PCRE_UNGREEDY option.
163     13. A change of greediness default within a pattern was not taking effect at
164     the current level for patterns like /(b+(?U)a+)/. It did apply to parenthesized
165     subpatterns that followed. Patterns like /b+(?U)a+/ worked because the option
166     was abstracted outside.
168     14. PCRE now supports the \G assertion. It is true when the current matching
169     position is at the start point of the match. This differs from \A when the
170     starting offset is non-zero. Used with the /g option of pcretest (or similar
171     code), it works in the same way as it does for Perl's /g option. If all
172     alternatives of a regex begin with \G, the expression is anchored to the start
173     match position, and the "anchored" flag is set in the compiled expression.
175     15. Some bugs concerning the handling of certain option changes within patterns
176     have been fixed. These applied to options other than (?ims). For example,
177     "a(?x: b c )d" did not match "XabcdY" but did match "Xa b c dY". It should have
178     been the other way round. Some of this was related to change 7 above.
180     16. PCRE now gives errors for /[.x.]/ and /[=x=]/ as unsupported POSIX
181     features, as Perl does. Previously, PCRE gave the warnings only for /[[.x.]]/
182     and /[[=x=]]/. PCRE now also gives an error for /[:name:]/ because it supports
183     POSIX classes only within a class (e.g. /[[:alpha:]]/).
185     17. Added support for Perl's \C escape. This matches one byte, even in UTF8
186     mode. Unlike ".", it always matches newline, whatever the setting of
187     PCRE_DOTALL. However, PCRE does not permit \C to appear in lookbehind
188     assertions. Perl allows it, but it doesn't (in general) work because it can't
189     calculate the length of the lookbehind. At least, that's the case for Perl
190     5.8.0 - I've been told they are going to document that it doesn't work in
191     future.
193     18. Added an error diagnosis for escapes that PCRE does not support: these are
194     \L, \l, \N, \P, \p, \U, \u, and \X.
196     19. Although correctly diagnosing a missing ']' in a character class, PCRE was
197     reading past the end of the pattern in cases such as /[abcd/.
199     20. PCRE was getting more memory than necessary for patterns with classes that
200     contained both POSIX named classes and other characters, e.g. /[[:space:]abc/.
202     21. Added some code, conditional on #ifdef VPCOMPAT, to make life easier for
203     compiling PCRE for use with Virtual Pascal.
205     22. Small fix to the Makefile to make it work properly if the build is done
206     outside the source tree.
208     23. Added a new extension: a condition to go with recursion. If a conditional
209     subpattern starts with (?(R) the "true" branch is used if recursion has
210     happened, whereas the "false" branch is used only at the top level.
212     24. When there was a very long string of literal characters (over 255 bytes
213     without UTF support, over 250 bytes with UTF support), the computation of how
214     much memory was required could be incorrect, leading to segfaults or other
215     strange effects.
217     25. PCRE was incorrectly assuming anchoring (either to start of subject or to
218     start of line for a non-DOTALL pattern) when a pattern started with (.*) and
219     there was a subsequent back reference to those brackets. This meant that, for
220     example, /(.*)\d+\1/ failed to match "abc123bc". Unfortunately, it isn't
221     possible to check for precisely this case. All we can do is abandon the
222     optimization if .* occurs inside capturing brackets when there are any back
223     references whatsoever. (See below for a better fix that came later.)
225     26. The handling of the optimization for finding the first character of a
226     non-anchored pattern, and for finding a character that is required later in the
227     match were failing in some cases. This didn't break the matching; it just
228     failed to optimize when it could. The way this is done has been re-implemented.
230     27. Fixed typo in error message for invalid (?R item (it said "(?p").
232     28. Added a new feature that provides some of the functionality that Perl
233     provides with (?{...}). The facility is termed a "callout". The way it is done
234     in PCRE is for the caller to provide an optional function, by setting
235     pcre_callout to its entry point. Like pcre_malloc and pcre_free, this is a
236     global variable. By default it is unset, which disables all calling out. To get
237     the function called, the regex must include (?C) at appropriate points. This
238     is, in fact, equivalent to (?C0), and any number <= 255 may be given with (?C).
239     This provides a means of identifying different callout points. When PCRE
240     reaches such a point in the regex, if pcre_callout has been set, the external
241     function is called. It is provided with data in a structure called
242     pcre_callout_block, which is defined in pcre.h. If the function returns 0,
243     matching continues; if it returns a non-zero value, the match at the current
244     point fails. However, backtracking will occur if possible. [This was changed
245     later and other features added - see item 49 below.]
247     29. pcretest is upgraded to test the callout functionality. It provides a
248     callout function that displays information. By default, it shows the start of
249     the match and the current position in the text. There are some new data escapes
250     to vary what happens:
252     \C+ in addition, show current contents of captured substrings
253     \C- do not supply a callout function
254     \C!n return 1 when callout number n is reached
255     \C!n!m return 1 when callout number n is reached for the mth time
257     30. If pcregrep was called with the -l option and just a single file name, it
258     output "<stdin>" if a match was found, instead of the file name.
260     31. Improve the efficiency of the POSIX API to PCRE. If the number of capturing
261     slots is less than POSIX_MALLOC_THRESHOLD, use a block on the stack to pass to
262     pcre_exec(). This saves a malloc/free per call. The default value of
263     POSIX_MALLOC_THRESHOLD is 10; it can be changed by --with-posix-malloc-threshold
264     when configuring.
266     32. The default maximum size of a compiled pattern is 64K. There have been a
267     few cases of people hitting this limit. The code now uses macros to handle the
268     storing of links as offsets within the compiled pattern. It defaults to 2-byte
269     links, but this can be changed to 3 or 4 bytes by --with-link-size when
270     configuring. Tests 2 and 5 work only with 2-byte links because they output
271     debugging information about compiled patterns.
273     33. Internal code re-arrangements:
275     (a) Moved the debugging function for printing out a compiled regex into
276     its own source file (printint.c) and used #include to pull it into
277     pcretest.c and, when DEBUG is defined, into pcre.c, instead of having two
278     separate copies.
280     (b) Defined the list of op-code names for debugging as a macro in
281     internal.h so that it is next to the definition of the opcodes.
283     (c) Defined a table of op-code lengths for simpler skipping along compiled
284     code. This is again a macro in internal.h so that it is next to the
285     definition of the opcodes.
287     34. Added support for recursive calls to individual subpatterns, along the
288     lines of Robin Houston's patch (but implemented somewhat differently).
290     35. Further mods to the Makefile to help Win32. Also, added code to pcregrep to
291     allow it to read and process whole directories in Win32. This code was
292     contributed by Lionel Fourquaux; it has not been tested by me.
294     36. Added support for named subpatterns. The Python syntax (?P<name>...) is
295     used to name a group. Names consist of alphanumerics and underscores, and must
296     be unique. Back references use the syntax (?P=name) and recursive calls use
297     (?P>name) which is a PCRE extension to the Python extension. Groups still have
298     numbers. The function pcre_fullinfo() can be used after compilation to extract
299     a name/number map. There are three relevant calls:
301     PCRE_INFO_NAMEENTRYSIZE yields the size of each entry in the map
302     PCRE_INFO_NAMECOUNT yields the number of entries
303     PCRE_INFO_NAMETABLE yields a pointer to the map.
305     The map is a vector of fixed-size entries. The size of each entry depends on
306     the length of the longest name used. The first two bytes of each entry are the
307     group number, most significant byte first. There follows the corresponding
308     name, zero terminated. The names are in alphabetical order.
310     37. Make the maximum literal string in the compiled code 250 for the non-UTF-8
311     case instead of 255. Making it the same both with and without UTF-8 support
312     means that the same test output works with both.
314     38. There was a case of malloc(0) in the POSIX testing code in pcretest. Avoid
315     calling malloc() with a zero argument.
317     39. Change 25 above had to resort to a heavy-handed test for the .* anchoring
318     optimization. I've improved things by keeping a bitmap of backreferences with
319     numbers 1-31 so that if .* occurs inside capturing brackets that are not in
320     fact referenced, the optimization can be applied. It is unlikely that a
321     relevant occurrence of .* (i.e. one which might indicate anchoring or forcing
322     the match to follow \n) will appear inside brackets with a number greater than
323     31, but if it does, any back reference > 31 suppresses the optimization.
325     40. Added a new compile-time option PCRE_NO_AUTO_CAPTURE. This has the effect
326     of disabling numbered capturing parentheses. Any opening parenthesis that is
327     not followed by ? behaves as if it were followed by ?: but named parentheses
328     can still be used for capturing (and they will acquire numbers in the usual
329     way).
331     41. Redesigned the return codes from the match() function into yes/no/error so
332     that errors can be passed back from deep inside the nested calls. A malloc
333     failure while inside a recursive subpattern call now causes the
334     PCRE_ERROR_NOMEMORY return instead of quietly going wrong.
336     42. It is now possible to set a limit on the number of times the match()
337     function is called in a call to pcre_exec(). This facility makes it possible to
338     limit the amount of recursion and backtracking, though not in a directly
339     obvious way, because the match() function is used in a number of different
340     circumstances. The count starts from zero for each position in the subject
341     string (for non-anchored patterns). The default limit is, for compatibility, a
342     large number, namely 10 000 000. You can change this in two ways:
344     (a) When configuring PCRE before making, you can use --with-match-limit=n
345     to set a default value for the compiled library.
347     (b) For each call to pcre_exec(), you can pass a pcre_extra block in which
348     a different value is set. See 45 below.
350     If the limit is exceeded, pcre_exec() returns PCRE_ERROR_MATCHLIMIT.
352     43. Added a new function pcre_config(int, void *) to enable run-time extraction
353     of things that can be changed at compile time. The first argument specifies
354     what is wanted and the second points to where the information is to be placed.
355     The current list of available information is:
359     The output is an integer that is set to one if UTF-8 support is available;
360     otherwise it is set to zero.
364     The output is an integer that it set to the value of the code that is used for
365     newline. It is either LF (10) or CR (13).
369     The output is an integer that contains the number of bytes used for internal
370     linkage in compiled expressions. The value is 2, 3, or 4. See item 32 above.
374     The output is an integer that contains the threshold above which the POSIX
375     interface uses malloc() for output vectors. See item 31 above.
379     The output is an unsigned integer that contains the default limit of the number
380     of match() calls in a pcre_exec() execution. See 42 above.
382     44. pcretest has been upgraded by the addition of the -C option. This causes it
383     to extract all the available output from the new pcre_config() function, and to
384     output it. The program then exits immediately.
386     45. A need has arisen to pass over additional data with calls to pcre_exec() in
387     order to support additional features. One way would have been to define
388     pcre_exec2() (for example) with extra arguments, but this would not have been
389     extensible, and would also have required all calls to the original function to
390     be mapped to the new one. Instead, I have chosen to extend the mechanism that
391     is used for passing in "extra" data from pcre_study().
393     The pcre_extra structure is now exposed and defined in pcre.h. It currently
394     contains the following fields:
396     flags a bitmap indicating which of the following fields are set
397     study_data opaque data from pcre_study()
398     match_limit a way of specifying a limit on match() calls for a specific
399     call to pcre_exec()
400     callout_data data for callouts (see 49 below)
402     The flag bits are also defined in pcre.h, and are
408     The pcre_study() function now returns one of these new pcre_extra blocks, with
409     the actual study data pointed to by the study_data field, and the
410     PCRE_EXTRA_STUDY_DATA flag set. This can be passed directly to pcre_exec() as
411     before. That is, this change is entirely upwards-compatible and requires no
412     change to existing code.
414     If you want to pass in additional data to pcre_exec(), you can either place it
415     in a pcre_extra block provided by pcre_study(), or create your own pcre_extra
416     block.
418     46. pcretest has been extended to test the PCRE_EXTRA_MATCH_LIMIT feature. If a
419     data string contains the escape sequence \M, pcretest calls pcre_exec() several
420     times with different match limits, until it finds the minimum value needed for
421     pcre_exec() to complete. The value is then output. This can be instructive; for
422     most simple matches the number is quite small, but for pathological cases it
423     gets very large very quickly.
425     47. There's a new option for pcre_fullinfo() called PCRE_INFO_STUDYSIZE. It
426     returns the size of the data block pointed to by the study_data field in a
427     pcre_extra block, that is, the value that was passed as the argument to
428     pcre_malloc() when PCRE was getting memory in which to place the information
429     created by pcre_study(). The fourth argument should point to a size_t variable.
430     pcretest has been extended so that this information is shown after a successful
431     pcre_study() call when information about the compiled regex is being displayed.
433     48. Cosmetic change to Makefile: there's no need to have / after $(DESTDIR)
434     because what follows is always an absolute path. (Later: it turns out that this
435     is more than cosmetic for MinGW, because it doesn't like empty path
436     components.)
438     49. Some changes have been made to the callout feature (see 28 above):
440     (i) A callout function now has three choices for what it returns:
442     0 => success, carry on matching
443     > 0 => failure at this point, but backtrack if possible
444     < 0 => serious error, return this value from pcre_exec()
446     Negative values should normally be chosen from the set of PCRE_ERROR_xxx
447     values. In particular, returning PCRE_ERROR_NOMATCH forces a standard
448     "match failed" error. The error number PCRE_ERROR_CALLOUT is reserved for
449     use by callout functions. It will never be used by PCRE itself.
451     (ii) The pcre_extra structure (see 45 above) has a void * field called
452     callout_data, with corresponding flag bit PCRE_EXTRA_CALLOUT_DATA. The
453     pcre_callout_block structure has a field of the same name. The contents of
454     the field passed in the pcre_extra structure are passed to the callout
455     function in the corresponding field in the callout block. This makes it
456     easier to use the same callout-containing regex from multiple threads. For
457     testing, the pcretest program has a new data escape
459     \C*n pass the number n (may be negative) as callout_data
461     If the callout function in pcretest receives a non-zero value as
462     callout_data, it returns that value.
464     50. Makefile wasn't handling CFLAGS properly when compiling dftables. Also,
465     there were some redundant $(CFLAGS) in commands that are now specified as
466     $(LINK), which already includes $(CFLAGS).
468     51. Extensions to UTF-8 support are listed below. These all apply when (a) PCRE
469     has been compiled with UTF-8 support *and* pcre_compile() has been compiled
470     with the PCRE_UTF8 flag. Patterns that are compiled without that flag assume
471     one-byte characters throughout. Note that case-insensitive matching applies
472     only to characters whose values are less than 256. PCRE doesn't support the
473     notion of cases for higher-valued characters.
475     (i) A character class whose characters are all within 0-255 is handled as
476     a bit map, and the map is inverted for negative classes. Previously, a
477     character > 255 always failed to match such a class; however it should
478     match if the class was a negative one (e.g. [^ab]). This has been fixed.
480     (ii) A negated character class with a single character < 255 is coded as
481     "not this character" (OP_NOT). This wasn't working properly when the test
482     character was multibyte, either singly or repeated.
484     (iii) Repeats of multibyte characters are now handled correctly in UTF-8
485     mode, for example: \x{100}{2,3}.
487     (iv) The character escapes \b, \B, \d, \D, \s, \S, \w, and \W (either
488     singly or repeated) now correctly test multibyte characters. However,
489     PCRE doesn't recognize any characters with values greater than 255 as
490     digits, spaces, or word characters. Such characters always match \D, \S,
491     and \W, and never match \d, \s, or \w.
493     (v) Classes may now contain characters and character ranges with values
494     greater than 255. For example: [ab\x{100}-\x{400}].
496     (vi) pcregrep now has a --utf-8 option (synonym -u) which makes it call
497     PCRE in UTF-8 mode.
499     52. The info request value PCRE_INFO_FIRSTCHAR has been renamed
500     PCRE_INFO_FIRSTBYTE because it is a byte value. However, the old name is
501     retained for backwards compatibility. (Note that LASTLITERAL is also a byte
502     value.)
504     53. The single man page has become too large. I have therefore split it up into
505     a number of separate man pages. These also give rise to individual HTML pages;
506     these are now put in a separate directory, and there is an index.html page that
507     lists them all. Some hyperlinking between the pages has been installed.
509     54. Added convenience functions for handling named capturing parentheses.
511     55. Unknown escapes inside character classes (e.g. [\M]) and escapes that
512     aren't interpreted therein (e.g. [\C]) are literals in Perl. This is now also
513     true in PCRE, except when the PCRE_EXTENDED option is set, in which case they
514     are faulted.
516     56. Introduced HOST_CC and HOST_CFLAGS which can be set in the environment when
517     calling configure. These values are used when compiling the dftables.c program
518     which is run to generate the source of the default character tables. They
519     default to the values of CC and CFLAGS. If you are cross-compiling PCRE,
520     you will need to set these values.
522     57. Updated the building process for Windows DLL, as provided by Fred Cox.
525     Version 3.9 02-Jan-02
526 nigel 61 ---------------------
528     1. A bit of extraneous text had somehow crept into the pcregrep documentation.
530     2. If --disable-static was given, the building process failed when trying to
531     build pcretest and pcregrep. (For some reason it was using libtool to compile
532     them, which is not right, as they aren't part of the library.)
535 nigel 59 Version 3.8 18-Dec-01
536     ---------------------
538     1. The experimental UTF-8 code was completely screwed up. It was packing the
539     bytes in the wrong order. How dumb can you get?
542 nigel 57 Version 3.7 29-Oct-01
543     ---------------------
545     1. In updating pcretest to check change 1 of version 3.6, I screwed up.
546     This caused pcretest, when used on the test data, to segfault. Unfortunately,
547     this didn't happen under Solaris 8, where I normally test things.
549 nigel 59 2. The Makefile had to be changed to make it work on BSD systems, where 'make'
550     doesn't seem to recognize that ./xxx and xxx are the same file. (This entry
551     isn't in ChangeLog distributed with 3.7 because I forgot when I hastily made
552     this fix an hour or so after the initial 3.7 release.)
553 nigel 57
554 nigel 59
555 nigel 55 Version 3.6 23-Oct-01
556     ---------------------
558     1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
559     offsets passed as NULL with zero offset count.
561     2. The config.guess and config.sub files had not been updated when I moved to
562     the latest autoconf.
565 nigel 53 Version 3.5 15-Aug-01
566     ---------------------
567 nigel 5
568 nigel 53 1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
569     had been forgotten.
571     2. By using declared but undefined structures, we can avoid using "void"
572     definitions in pcre.h while keeping the internal definitions of the structures
573     private.
575     3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
576     user point of view, this means that both static and shared libraries are built
577     by default, but this can be individually controlled. More of the work of
578     handling this static/shared cases is now inside libtool instead of PCRE's make
579     file.
581     4. The pcretest utility is now installed along with pcregrep because it is
582     useful for users (to test regexs) and by doing this, it automatically gets
583     relinked by libtool. The documentation has been turned into a man page, so
584     there are now .1, .txt, and .html versions in /doc.
586     5. Upgrades to pcregrep:
587     (i) Added long-form option names like gnu grep.
588     (ii) Added --help to list all options with an explanatory phrase.
589     (iii) Added -r, --recursive to recurse into sub-directories.
590     (iv) Added -f, --file to read patterns from a file.
592     6. pcre_exec() was referring to its "code" argument before testing that
593     argument for NULL (and giving an error if it was NULL).
595     7. Upgraded Makefile.in to allow for compiling in a different directory from
596     the source directory.
598     8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
599     options bits, the pointer it was passed was to an int instead of to an unsigned
600     long int. This mattered only on 64-bit systems.
602     9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
603     generated) instead of pcre.in, which it its source. Also made the same change
604     in several of the .c files.
606     10. A new release of gcc defines printf() as a macro, which broke pcretest
607     because it had an ifdef in the middle of a string argument for printf(). Fixed
608     by using separate calls to printf().
610     11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
611     script, to force use of CR or LF instead of \n in the source. On non-Unix
612     systems, the value can be set in config.h.
614     12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
615     absolute limit. Changed the text of the error message to make this clear, and
616     likewise updated the man page.
618     13. The limit of 99 on the number of capturing subpatterns has been removed.
619     The new limit is 65535, which I hope will not be a "real" limit.
622 nigel 51 Version 3.4 22-Aug-00
623     ---------------------
625     1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
627     2. Diagnose condition (?(0) as an error instead of crashing on matching.
630 nigel 49 Version 3.3 01-Aug-00
631     ---------------------
633     1. If an octal character was given, but the value was greater than \377, it
634     was not getting masked to the least significant bits, as documented. This could
635     lead to crashes in some systems.
637     2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
638     the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
640     3. Added the functions pcre_free_substring() and pcre_free_substring_list().
641     These just pass their arguments on to (pcre_free)(), but they are provided
642     because some uses of PCRE bind it to non-C systems that can call its functions,
643     but cannot call free() or pcre_free() directly.
645     4. Add "make test" as a synonym for "make check". Corrected some comments in
646     the Makefile.
648     5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
649     Makefile.
651     6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
652     command called pgrep for grepping around the active processes.
654     7. Added the beginnings of support for UTF-8 character strings.
656     8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
657     RANLIB to ./ltconfig so that they are used by libtool. I think these are all
658     the relevant ones. (AR is not passed because ./ltconfig does its own figuring
659     out for the ar command.)
662 nigel 47 Version 3.2 12-May-00
663     ---------------------
665     This is purely a bug fixing release.
667     1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
668     of ZA. This was just one example of several cases that could provoke this bug,
669     which was introduced by change 9 of version 2.00. The code for breaking
670     infinite loops after an iteration that matches an empty string was't working
671     correctly.
673     2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
674     when matched against abbab (for example). After matching an empty string, it
675     wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
676     caused it to match further down the string than it should.
678     3. The code contained an inclusion of sys/types.h. It isn't clear why this
679     was there because it doesn't seem to be needed, and it causes trouble on some
680     systems, as it is not a Standard C header. It has been removed.
682     4. Made 4 silly changes to the source to avoid stupid compiler warnings that
683     were reported on the Macintosh. The changes were from
685     while ((c = *(++ptr)) != 0 && c != '\n');
686     to
687     while ((c = *(++ptr)) != 0 && c != '\n') ;
689     Totally extraordinary, but if that's what it takes...
691     5. PCRE is being used in one environment where neither memmove() nor bcopy() is
692     available. Added HAVE_BCOPY and an autoconf test for it; if neither
693     HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
694     assumes the way PCRE uses memmove() (always moving upwards).
696     6. PCRE is being used in one environment where strchr() is not available. There
697     was only one use in pcre.c, and writing it out to avoid strchr() probably gives
698     faster code anyway.
701 nigel 45 Version 3.1 09-Feb-00
702     ---------------------
704     The only change in this release is the fixing of some bugs in Makefile.in for
705     the "install" target:
707     (1) It was failing to install pcreposix.h.
709     (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
712 nigel 43 Version 3.0 01-Feb-00
713     ---------------------
714 nigel 41
715     1. Add support for the /+ modifier to perltest (to output $` like it does in
716     pcretest).
718     2. Add support for the /g modifier to perltest.
720     3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
721     matches null strings.
723     4. Fix perltest so that it doesn't do unwanted things when fed an empty
724     pattern. Perl treats empty patterns specially - it reuses the most recent
725     pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
726     effect.
728     5. The POSIX interface was broken in that it was just handing over the POSIX
729     captured string vector to pcre_exec(), but (since release 2.00) PCRE has
730     required a bigger vector, with some working space on the end. This means that
731     the POSIX wrapper now has to get and free some memory, and copy the results.
733 nigel 43 6. Added some simple autoconf support, placing the test data and the
734     documentation in separate directories, re-organizing some of the
735     information files, and making it build pcre-config (a GNU standard). Also added
736     libtool support for building PCRE as a shared library, which is now the
737     default.
738 nigel 41
739 nigel 43 7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
740     09 are not valid octal constants. Single digits will be used for minor values
741     less than 10.
743     8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
744     existing programs that set these in the POSIX interface can use PCRE without
745     modification.
747     9. Added a new function, pcre_fullinfo() with an extensible interface. It can
748     return all that pcre_info() returns, plus additional data. The pcre_info()
749     function is retained for compatibility, but is considered to be obsolete.
751     10. Added experimental recursion feature (?R) to handle one common case that
752     Perl 5.6 will be able to do with (?p{...}).
754     11. Added support for POSIX character classes like [:alpha:], which Perl is
755     adopting.
758 nigel 39 Version 2.08 31-Aug-99
759     ----------------------
761     1. When startoffset was not zero and the pattern began with ".*", PCRE was not
762     trying to match at the startoffset position, but instead was moving forward to
763     the next newline as if a previous match had failed.
765     2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
766     and could get into a loop if a null string was matched other than at the start
767     of the subject.
769     3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
770     be distinguished at compile time, and for completeness also added PCRE_DATE.
772     5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
773     in GnuWin32 environments.
776 nigel 37 Version 2.07 29-Jul-99
777     ----------------------
779     1. The documentation is now supplied in plain text form and HTML as well as in
780     the form of man page sources.
782     2. C++ compilers don't like assigning (void *) values to other pointer types.
783     In particular this affects malloc(). Although there is no problem in Standard
784     C, I've put in casts to keep C++ compilers happy.
786     3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
787     should be (const char *).
789     4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
790     be useful for non-Unix systems who don't want to bother with the POSIX stuff.
791     However, I haven't made this a standard facility. The documentation doesn't
792     mention it, and the Makefile doesn't support it.
794     5. The Makefile now contains an "install" target, with editable destinations at
795     the top of the file. The pcretest program is not installed.
797     6. pgrep -V now gives the PCRE version number and date.
799     7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
800     causing the entire string to be ignored, instead of just the last character.
802     8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
803     non-matching string, it can take a very, very long time, even for strings of
804     quite modest length, because of the nested recursion. PCRE now does better in
805     some of these cases. It does this by remembering the last required literal
806     character in the pattern, and pre-searching the subject to ensure it is present
807     before running the real match. In other words, it applies a heuristic to detect
808     some types of certain failure quickly, and in the above example, if presented
809     with a string that has no trailing " it gives "no match" very quickly.
811     9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
812     other alternatives are tried instead.
815 nigel 35 Version 2.06 09-Jun-99
816     ----------------------
818     1. Change pcretest's output for amount of store used to show just the code
819     space, because the remainder (the data block) varies in size between 32-bit and
820     64-bit systems.
822     2. Added an extra argument to pcre_exec() to supply an offset in the subject to
823     start matching at. This allows lookbehinds to work when searching for multiple
824     occurrences in a string.
826     3. Added additional options to pcretest for testing multiple occurrences:
828     /+ outputs the rest of the string that follows a match
829     /g loops for multiple occurrences, using the new startoffset argument
830     /G loops for multiple occurrences by passing an incremented pointer
832     4. PCRE wasn't doing the "first character" optimization for patterns starting
833     with \b or \B, though it was doing it for other lookbehind assertions. That is,
834     it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
835     the letter 'x'. On long subject strings, this gives a significant speed-up.
838 nigel 33 Version 2.05 21-Apr-99
839     ----------------------
841     1. Changed the type of magic_number from int to long int so that it works
842     properly on 16-bit systems.
844     2. Fixed a bug which caused patterns starting with .* not to work correctly
845     when the subject string contained newline characters. PCRE was assuming
846     anchoring for such patterns in all cases, which is not correct because .* will
847     not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
848     DOTALL is set at top level; otherwise it knows that patterns starting with .*
849     must be retried after every newline in the subject.
852 nigel 31 Version 2.04 18-Feb-99
853     ----------------------
855     1. For parenthesized subpatterns with repeats whose minimum was zero, the
856     computation of the store needed to hold the pattern was incorrect (too large).
857     If such patterns were nested a few deep, this could multiply and become a real
858     problem.
860     2. Added /M option to pcretest to show the memory requirement of a specific
861     pattern. Made -m a synonym of -s (which does this globally) for compatibility.
863     3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
864     compiled in such a way that the backtracking after subsequent failure was
865     pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
866     ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
869 nigel 29 Version 2.03 02-Feb-99
870     ----------------------
872     1. Fixed typo and small mistake in man page.
874 nigel 31 2. Added 4th condition (GPL supersedes if conflict) and created separate
875     LICENCE file containing the conditions.
876 nigel 29
877     3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
878     Perl, that is the internal \ allows the delimiter to be included in the
879     pattern. Locked out the use of \ as a delimiter. If \ immediately follows
880     the final delimiter, add \ to the end of the pattern (to test the error).
882     4. Added the convenience functions for extracting substrings after a successful
883     match. Updated pcretest to make it able to test these functions.
886 nigel 27 Version 2.02 14-Jan-99
887     ----------------------
889     1. Initialized the working variables associated with each extraction so that
890     their saving and restoring doesn't refer to uninitialized store.
892     2. Put dummy code into study.c in order to trick the optimizer of the IBM C
893     compiler for OS/2 into generating correct code. Apparently IBM isn't going to
894     fix the problem.
896     3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
897     calls, and wasn't printing the correct value for compiling calls. Increased the
898     default value of LOOPREPEAT, and the number of significant figures in the
899     times.
901     4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
903     5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
904     a building problem on Windows NT with a FAT file system.
907 nigel 25 Version 2.01 21-Oct-98
908     ----------------------
910     1. Changed the API for pcre_compile() to allow for the provision of a pointer
911     to character tables built by pcre_maketables() in the current locale. If NULL
912     is passed, the default tables are used.
915 nigel 23 Version 2.00 24-Sep-98
916 nigel 21 ----------------------
918 nigel 23 1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
919     it any more.
921     2. Allow quantification of (?>) groups, and make it work correctly.
923     3. The first character computation wasn't working for (?>) groups.
925     4. Correct the implementation of \Z (it is permitted to match on the \n at the
926     end of the subject) and add 5.005's \z, which really does match only at the
927     very end of the subject.
929     5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
931     6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
932     DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
933     localized options. All options to pcre_study() were also removed.
935     7. Add other new features from 5.005:
937     $(?<= positive lookbehind
938     $(?<! negative lookbehind
939     (?imsx-imsx) added the unsetting capability
940     such a setting is global if at outer level; local otherwise
941     (?imsx-imsx:) non-capturing groups with option setting
942     (?(cond)re|re) conditional pattern matching
944     A backreference to itself in a repeated group matches the previous
945     captured string.
947     8. General tidying up of studying (both automatic and via "study")
948     consequential on the addition of new assertions.
950     9. As in 5.005, unlimited repeated groups that could match an empty substring
951     are no longer faulted at compile time. Instead, the loop is forcibly broken at
952     runtime if any iteration does actually match an empty substring.
954     10. Include the RunTest script in the distribution.
956     11. Added tests from the Perl 5.005_02 distribution. This showed up a few
957     discrepancies, some of which were old and were also with respect to 5.004. They
958     have now been fixed.
961     Version 1.09 28-Apr-98
962     ----------------------
964 nigel 21 1. A negated single character class followed by a quantifier with a minimum
965     value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to
966     program crashes, or just wrong answers. This did not apply to negated classes
967     containing more than one character, or to minima other than one.
970 nigel 19 Version 1.08 27-Mar-98
971     ----------------------
973     1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
975     2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
976     latter must appear before anything that relies on it in the pattern.
979 nigel 17 Version 1.07 16-Feb-98
980     ----------------------
982     1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
983     repeat of a potentially empty string).
986 nigel 15 Version 1.06 23-Jan-98
987     ----------------------
989     1. Added Markus Oberhumer's little patches for C++.
991     2. Literal strings longer than 255 characters were broken.
994 nigel 13 Version 1.05 23-Dec-97
995     ----------------------
997     1. Negated character classes containing more than one character were failing if
998     PCRE_CASELESS was set at run time.
1001 nigel 11 Version 1.04 19-Dec-97
1002     ----------------------
1004     1. Corrected the man page, where some "const" qualifiers had been omitted.
1006     2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
1007     input syntax.
1009     3. Fixed memory leak which occurred when a regex with back references was
1010     matched with an offsets vector that wasn't big enough. The temporary memory
1011     that is used in this case wasn't being freed if the match failed.
1013     4. Tidied pcretest to ensure it frees memory that it gets.
1015     5. Temporary memory was being obtained in the case where the passed offsets
1016     vector was exactly big enough.
1018     6. Corrected definition of offsetof() from change 5 below.
1020     7. I had screwed up change 6 below and broken the rules for the use of
1021     setjmp(). Now fixed.
1024 nigel 9 Version 1.03 18-Dec-97
1025     ----------------------
1027     1. A erroneous regex with a missing opening parenthesis was correctly
1028     diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
1029     on some systems.
1031     2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
1032     it was reported that one broken compiler failed on the former because "code" is
1033     also an independent variable.
1035     3. The erroneous regex a[]b caused an array overrun reference.
1037     4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
1038     fail on data ending with that character. (It was going on too far, and checking
1039     the next character, typically a binary zero.) This was specific to the
1040     optimized code for single-character negative classes.
1042     5. Added a contributed patch from the TIN world which does the following:
1044     + Add an undef for memmove, in case the the system defines a macro for it.
1046     + Add a definition of offsetof(), in case there isn't one. (I don't know
1047     the reason behind this - offsetof() is part of the ANSI standard - but
1048     it does no harm).
1050     + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
1051     most of the places where whitespace preceded '#'. I have given up and
1052     allowed the remaining 2 cases to be at the margin.
1054     + Rename some variables in pcre to eliminate shadowing. This seems very
1055     pedantic, but does no harm, of course.
1057     6. Moved the call to setjmp() into its own function, to get rid of warnings
1058     from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
1060     7. Constructs such as \d{8,} were compiling into the equivalent of
1061 nigel 11 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
1062 nigel 9 outcome, but in this particular case used more store than had been allocated,
1063     which caused the bug to be discovered because it threw up an internal error.
1065     8. The debugging code in both pcre and pcretest for outputting the compiled
1066     form of a regex was going wrong in the case of back references followed by
1067     curly-bracketed repeats.
1070 nigel 7 Version 1.02 12-Dec-97
1071     ----------------------
1073     1. Typos in pcre.3 and comments in the source fixed.
1075     2. Applied a contributed patch to get rid of places where it used to remove
1076     'const' from variables, and fixed some signed/unsigned and uninitialized
1077     variable warnings.
1079     3. Added the "runtest" target to Makefile.
1081     4. Set default compiler flag to -O2 rather than just -O.
1084 nigel 5 Version 1.01 19-Nov-97
1085     ----------------------
1087     1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
1088     like /([ab]*)*/, that is, for classes with more than one character in them.
1090     2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
1091     as /((?>a*))*/ (a PCRE_EXTRA facility).
1094     Version 1.00 18-Nov-97
1095     ----------------------
1097     1. Added compile-time macros to support systems such as SunOS4 which don't have
1098     memmove() or strerror() but have other things that can be used instead.
1100     2. Arranged that "make clean" removes the executables.
1103 nigel 3 Version 0.99 27-Oct-97
1104     ----------------------
1106     1. Fixed bug in code for optimizing classes with only one character. It was
1107     initializing a 32-byte map regardless, which could cause it to run off the end
1108     of the memory it had got.
1110     2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
1113     Version 0.98 22-Oct-97
1114     ----------------------
1116     1. Fixed bug in code for handling temporary memory usage when there are more
1117     back references than supplied space in the ovector. This could cause segfaults.
1120     Version 0.97 21-Oct-97
1121     ----------------------
1123     1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
1125     2. Optimized negated single characters not to use a bit map.
1127     3. Brought error texts together as macro definitions; clarified some of them;
1128     fixed one that was wrong - it said "range out of order" when it meant "invalid
1129     escape sequence".
1131     4. Changed some char * arguments to const char *.
1133     5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
1135     6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
1136     pcretest.
1139     Version 0.96 16-Oct-97
1140     ----------------------
1142     1. Added a simple "pgrep" utility to the distribution.
1144     2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
1145     unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
1146     where "ddd" means "one or more decimal digits".
1148     3. Fixed serious bug. If a pattern had a back reference, but the call to
1149     pcre_exec() didn't supply a large enough ovector to record the related
1150     identifying subpattern, the match always failed. PCRE now remembers the number
1151     of the largest back reference, and gets some temporary memory in which to save
1152     the offsets during matching if necessary, in order to ensure that
1153     backreferences always work.
1155     4. Increased the compatibility with Perl in a number of ways:
1157     (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
1158     to request this handling. The option can be set at compile or exec time.
1160     (b) $ matches before a terminating newline by default; an option
1161     PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
1162     mode). The option can be set at compile or exec time.
1164     (c) The handling of \ followed by a digit other than 0 is now supposed to be
1165     the same as Perl's. If the decimal number it represents is less than 10
1166     or there aren't that many previous left capturing parentheses, an octal
1167     escape is read. Inside a character class, it's always an octal escape,
1168     even if it is a single digit.
1170     (d) An escaped but undefined alphabetic character is taken as a literal,
1171     unless PCRE_EXTRA is set. Currently this just reserves the remaining
1172     escapes.
1174     (e) {0} is now permitted. (The previous item is removed from the compiled
1175     pattern).
1177     5. Changed all the names of code files so that the basic parts are no longer
1178     than 10 characters, and abolished the teeny "globals.c" file.
1180     6. Changed the handling of character classes; they are now done with a 32-byte
1181     bit map always.
1183     7. Added the -d and /D options to pcretest to make it possible to look at the
1184     internals of compilation without having to recompile pcre.
1187     Version 0.95 23-Sep-97
1188     ----------------------
1190     1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
1191     \x20 at the start of a run of normal characters. These were being treated as
1192     real characters, instead of the source characters being re-checked.
1195     Version 0.94 18-Sep-97
1196     ----------------------
1198     1. The functions are now thread-safe, with the caveat that the global variables
1199     containing pointers to malloc() and free() or alternative functions are the
1200     same for all threads.
1202     2. Get pcre_study() to generate a bitmap of initial characters for non-
1203     anchored patterns when this is possible, and use it if passed to pcre_exec().
1206     Version 0.93 15-Sep-97
1207     ----------------------
1209     1. /(b)|(:+)/ was computing an incorrect first character.
1211     2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
1212     but not actually doing anything yet.
1214     3. Treat "-" characters in classes that cannot be part of ranges as literals,
1215     as Perl does (e.g. [-az] or [az-]).
1217     4. Set the anchored flag if a branch starts with .* or .*? because that tests
1218     all possible positions.
1220     5. Split up into different modules to avoid including unneeded functions in a
1221     compiled binary. However, compile and exec are still in one module. The "study"
1222     function is split off.
1224     6. The character tables are now in a separate module whose source is generated
1225     by an auxiliary program - but can then be edited by hand if required. There are
1226     now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
1227     toupper() in the code.
1229     7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
1230     make them global. Abolish the function for setting them, as the caller can now
1231     set them directly.
1234     Version 0.92 11-Sep-97
1235     ----------------------
1237     1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
1238     (e.g. /a{1,3}/) was broken (I mis-optimized it).
1240     2. Caseless matching was not working in character classes if the characters in
1241     the pattern were in upper case.
1243     3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
1245     4. Make PCRE_ANCHORED public and accept as a compile option.
1247     5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
1248     PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
1249     pass them.
1251     6. Give an error if bad option bits passed at compile or run time.
1253     7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
1254     pcretest to cause it to pass that flag.
1256     8. Add pcre_info(), to get the number of identifying subpatterns, the stored
1257     options, and the first character, if set.
1259     9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
1262     Version 0.91 10-Sep-97
1263     ----------------------
1265     1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
1266     match the empty string as in /(a*)*/. It was looping and ultimately crashing.
1268     2. PCRE was looping on encountering an indefinitely repeated back reference to
1269     a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
1270     Perl does - treats the match as successful.
1272     ****

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