Re: Parameter expansion, patterns and fnmatch

[Chet Ramey <chet.ramey@xxxxxxxx>]

On 9/2/16 10:46 AM, Herbert Xu wrote:
> On Fri, Sep 02, 2016 at 09:25:15AM -0500, Eric Blake wrote:
>>
>> 2.13.1 Patterns Matching a Single Character
>>
>> [
>>     If an open bracket introduces a bracket expression as in XBD RE
>> Bracket Expression, except that the <exclamation-mark> character ( '!' )
>> shall replace the <circumflex> character ( '^' ) in its role in a
>> non-matching list in the regular expression notation, it shall introduce
>> a pattern bracket expression. A bracket expression starting with an
>> unquoted <circumflex> character produces unspecified results. Otherwise,
>> '[' shall match the character itself.
> 
> BTW, this last sentence is not present in
> 
> http://pubs.opengroup.org/onlinepubs/009604499/utilities/xcu_chap02.html#tag_02_13

That's pretty old; it's from 2004.

> So I presume it's a newer unreleased revision.

It's in the current revision, which dates from 2008.

> 
> Seriously, you guys are turning POSIX into a joke by introducing
> all these new requirements.  At this point I think we should
> pretty much give up on POSIX compliance the way it's headed.

Let's not go overboard here.  This was introduced to tighten up ambiguous
behavior: what happens when the open bracket *doesn't* introduce a
bracket expression.


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