On 07/25/2011 12:30 AM, Bruno Haible wrote:
Hi,
GNU grep (I tested versions 2.5, 2.7, 2.9) appears to assign a meaning to
the backslash single-quote character sequence in the argument that ought to
be a Basic Regular Expression.
$ grep --version
grep (GNU grep) 2.9
...
$ echo ' abc" ' | grep "\"\\'"
$ echo ' abc"' | grep "\"\\'"
abc"
It's end-of-buffer, together with \` for beginning of buffer. It makes
a difference from ^ and $ when using -z, IIRC.
As a quality of implementation issue, I would prefer to get an error message
for such an undefined BRE.
I don't think this is a good idea. There are certainly a lot of scripts
in the wild using \" (due to confusion about quoting) or \- (due to lack
of knowledge of "--" command-line behavior).
Paolo
