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Sat Feb 24 21:40:13 2007 UTC (8 years, 7 months ago) by nigel
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Load pcre-4.2 into code/trunk.
1 ChangeLog for PCRE
2 ------------------
4 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
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 Version 4.1 12-Mar-03
59 ---------------------
61 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 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 ---------------------
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 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 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 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.)
555 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 Version 3.5 15-Aug-01
566 ---------------------
568 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 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 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 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 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 Version 3.0 01-Feb-00
713 ---------------------
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 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.
739 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 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 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 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 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 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 Version 2.03 02-Feb-99
870 ----------------------
872 1. Fixed typo and small mistake in man page.
874 2. Added 4th condition (GPL supersedes if conflict) and created separate
875 LICENCE file containing the conditions.
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 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 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 Version 2.00 24-Sep-98
916 ----------------------
918 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 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 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 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 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 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 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 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 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
1062 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 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 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 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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