Upstream bugfix release: grep no longer clobbers heap for an ERE like '(^| )*( |$)' [bug introduced in grep-2.6]
grep is faster on regular expressions that match multibyte characters in brackets (such as '[áéíóú]'). echo c|grep '[c]' would fail for any c in 0x80..0xff, with a uni-byte encoding for which the byte-to-wide-char mapping is nontrivial. For example, the ISO-88591 locales are not affected, but ru_RU.KOI8-R is. [bug introduced in grep-2.6] grep -P no longer aborts when PCRE's backtracking limit is exceeded Before, echo aaaaaaaaaaaaaab |grep -P '((a+)*)+$' would abort. Now, it diagnoses the problem and exits with status 2. Signoff both, Allan
