grep and anchoring

[Matthew Seaman]

On 26/06/2016 15:44, Daniël de Kok wrote:
> Note the anchoring (^), the pattern should only match any four characters at the beginning of the line, so the expected output is ‘1234’ and nothing more. ‘ 123' and '4 12' are not at the beginning of the line and should consequently not be printed to stdout.
> 
> For comparison, the output of a recent GNU grep:
> 
> —
> %  echo "1234 1234 1234" | grep -o '^....'
> 1234
> —

You are completely correct -- this is a bug in grep(1) on FreeBSD.  In
all current releases including the upcoming 11.0-RELEASE grep is
actually GNU grep version 2.1.5.  However, the same bug occurs in
bsdgrep(1):

% echo 1234 1234 1234 | bsdgrep -o '^....'
1234
 123
4 12

There is already an open PR about a very similar issue:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201650

Could you update that PR with your findings?  Especially that bsdgrep(1)
also shows the same problem.

	Cheers,

	Matthew


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