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ChangeLog for PCRE |
ChangeLog for PCRE |
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Version 8.13 30-Apr-2011 |
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1. The Unicode data tables have been updated to Unicode 6.0.0. |
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2. Two minor typos in pcre_internal.h have been fixed. |
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3. Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and |
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pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr() |
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in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2). |
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4. There were a number of related bugs in the code for matching backrefences |
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caselessly in UTF-8 mode when codes for the characters concerned were |
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different numbers of bytes. For example, U+023A and U+2C65 are an upper |
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and lower case pair, using 2 and 3 bytes, respectively. The main bugs were: |
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(a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte |
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code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a |
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2-byte code at the end of the subject (it thought there wasn't enough data |
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left). |
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5. Comprehensive information about what went wrong is now returned by |
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pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long |
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as the output vector has at least 2 elements. The offset of the start of |
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the failing character and a reason code are placed in the vector. |
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6. When the UTF-8 string check fails for pcre_compile(), the offset that is |
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now returned is for the first byte of the failing character, instead of the |
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last byte inspected. This is an incompatible change, but I hope it is small |
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enough not to be a problem. It makes the returned offset consistent with |
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pcre_exec() and pcre_dfa_exec(). |
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7. pcretest now gives a text phrase as well as the error number when |
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pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check |
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failure, the offset and reason code are output. |
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8. When \R was used with a maximizing quantifier it failed to skip backwards |
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over a \r\n pair if the subsequent match failed. Instead, it just skipped |
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back over a single character (\n). This seems wrong (because it treated the |
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two characters as a single entity when going forwards), conflicts with the |
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documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the |
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behaviour of \R* different to (\R)*, which also seems wrong. The behaviour |
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has been changed. |
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9. Some internal refactoring has changed the processing so that the handling |
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of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile |
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time (the PCRE_DOTALL option was changed this way some time ago: version |
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7.7 change 16). This has made it possible to abolish the OP_OPT op code, |
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which was always a bit of a fudge. It also means that there is one less |
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argument for the match() function, which reduces its stack requirements |
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slightly. This change also fixes an incompatibility with Perl: the pattern |
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(?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match. |
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10. More internal refactoring has drastically reduced the number of recursive |
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calls to match() for possessively repeated groups such as (abc)++ when |
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using pcre_exec(). |
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11. While implementing 10, a number of bugs in the handling of groups were |
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discovered and fixed: |
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(?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind). |
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(a|)*(?1) gave a compile-time internal error. |
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((a|)+)+ did not notice that the outer group could match an empty string. |
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(^a|^)+ was not marked as anchored. |
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(.*a|.*)+ was not marked as matching at start or after a newline. |
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12. Yet more internal refactoring has removed another argument from the match() |
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function. Special calls to this function are now indicated by setting a |
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value in a variable in the "match data" data block. |
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13. Be more explicit in pcre_study() instead of relying on "default" for |
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opcodes that mean there is no starting character; this means that when new |
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ones are added and accidentally left out of pcre_study(), testing should |
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pick them up. |
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14. The -s option of pcretest has been documented for ages as being an old |
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synonym of -m (show memory usage). I have changed it to mean "force study |
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for every regex", that is, assume /S for every regex. This is similar to -i |
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and -d etc. It's slightly incompatible, but I'm hoping nobody is still |
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using it. It makes it easier to run collection of tests with study enabled, |
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and thereby test pcre_study() more easily. |
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15. When (*ACCEPT) was used in a subpattern that was called recursively, the |
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restoration of the capturing data to the outer values was not happening |
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correctly. |
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16. If a recursively called subpattern ended with (*ACCEPT) and matched an |
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empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole |
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pattern had matched an empty string, and so incorrectly returned a no |
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match. |
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Version 8.12 15-Jan-2011 |
Version 8.12 15-Jan-2011 |
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