cb0b65eca2
Changelog:
* Noteworthy changes in release 2.22 (2015-11-01) [stable]
** Improvements
Performance has improved for patterns containing very long strings,
reducing preprocessing time for an N-byte regexp from O(N^2) to
only slightly superlinear for most patterns. Before, a command like
the following would take over a minute, but now, it takes less than
a second:
: | grep -f <(seq -s '' 99999)
When building grep, 'configure' now uses PCRE's pkg-config module for
configuration information, rather than attempting to guess it by hand.
** Bug fixes
A DFA matcher bug made this command mistakenly print its input line:
echo axb | grep -E '^x|x$'
Likewise for this equivalent command:
echo axb | grep -e '^x' -e 'x$'
[bug introduced in grep-2.19 ]
grep no longer reads from uninitialized memory or from beyond the end
of the heap-allocated input buffer. This fix addressed CVE-2015-1345.
[bug introduced in grep-2.19 ]
With -z, '.' and '[^x]' in a pattern now consistently match newline.
Previously, they sometimes matched newline, and sometimes did not.
[bug introduced in grep-2.4]
When the JIT stack is exhausted, grep -P now grows the stack rather
than reporting an internal PCRE error.
'grep -D skip PATTERN FILE' no longer hangs if FILE is a fifo.
[bug introduced in grep-2.12]
--exclude and related options are now matched against entire
command-line arguments, not against command-line components.
[bug introduced in grep-2.6]
Fix performance degradation of grep -Fw in unibyte locales.
[bug introduced in grep-2.19 ]
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