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Re: Bash-4.3-rc2 available for FTP


From: Chet Ramey
Subject: Re: Bash-4.3-rc2 available for FTP
Date: Thu, 30 Jan 2014 21:04:00 -0500
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On 1/30/14, 7:18 PM, Mike Frysinger wrote:

>> The effect of \- in an ERE is still undefined.
> 
> so it is.  yet still irrelevant.  the GNU library defines behavior explicitly:
> https://www.gnu.org/software/gnulib/manual/html_node/The-Backslash-Character.html#The-Backslash-Character
> 
> and it still doesn't explain why every version from bash-3.0 through bash-4.2 
> behaves the same but bash-4.3 does not.  the release notes specifically call 
> out backslash changes to make things "more consistent behavior".  i don't 
> changing the behavior of the example i posted makes sense.

You might take a look at a recent discussion for some context:

http://lists.gnu.org/archive/html/bug-bash/2014-01/msg00091.html

Different regexp engines (and different shells) differ on things as
seemingly simple as

[[ x =~ \x ]]

and

bs='\'
[[ x =~ ${bs}x ]]

The case you cited is one I'm still looking at.  There's a comment in the
code to that effect.

Chet
- -- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/
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