GNU bug report logs - #18266
grep -P and invalid exits with error

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Vincent Lefevre <vincent <at> vinc17.net>
Cc: 18266 <at> debbugs.gnu.org, 758105 <at> bugs.debian.org
Subject: bug#18266: handling bytes not part of the charset, and other garbage
Date: Fri, 12 Sep 2014 14:39:35 -0700

On 09/12/2014 02:29 PM, Vincent Lefevre wrote:

> an option to control what happens on encoding errors would be better 
> and sufficient.

It might suffice for your use cases, but it's more complicated and less 
flexible than being able to match bytes within the regular expression.  
(Plus, someone would have to implement it, which is perhaps the biggest 
objection to either approach ....)  But I take your point that \C is 
best avoided.  This whole area is pretty hairy, I'm afraid.

Speaking of hairy, why doesn't grep use PCRE_MULTILINE?  Using 
PCRE_MULTILINE shouldn't be that hard, and should boost performance 
quite a bit in typical usage.  Or am I being too optimistic here?

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