Date: Wed, 11 Apr 2012 19:30:15 GMT From: Jim Pryor <dubiousjim@gmail.com> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/166842: bsdgrep(1) inconsistently handles ^ in non-anchoring positions Message-ID: <201204111930.q3BJUFgv081178@freefall.freebsd.org>
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The following reply was made to PR bin/166842; it has been noted by GNATS. From: Jim Pryor <dubiousjim@gmail.com> To: bug-followup@FreeBSD.org Cc: Subject: Re: bin/166842: bsdgrep(1) inconsistently handles ^ in non-anchoring positions Date: Wed, 11 Apr 2012 15:21:01 -0400 I've noticed some more issues with the same version of grep. I don't know whether they're related, but I'll append them here for now. $ printf abc | grep -o '^[a-c]' should just print 'a', but instead gives three hits, against each letter of the incoming text. The same issue occurs when handling multiline buffers: $ printf 'abc\ndef' | grep -o --null '^[a-f]' incorrectly matches 6 times. $ printf 'abc\ndef' | grep -o --null '[a-f]$' correctly only matches 'c' and 'f'. $ printf 'abc\ndef' | grep -o --null '\`[a-f]' has the same issue as ^, whereas: $ printf 'abc\ndef' | grep -o --null '[a-f]\'\' matches 'c' and 'f'. To fix \` in a way that matches the behavior of \', it should only match the 'a' and 'd'. In fact, though, both of these should only match against a single character: 'a' for \` and 'f' for \'. That's the specified behavior of these Gnu extensions, and how they behave in the Gnu grep and BusyBox grep implementations I'm testing against. If that behavior isn't going to be provided, then wouldn't it'd be better for these extensions not even pretend to be present? And so, just match against a literal ` or '? -- dubiousjim@gmail.com
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