A NOTE has been added to this issue. 
====================================================================== 
http://austingroupbugs.net/view.php?id=375 
====================================================================== 
Reported By:                dwheeler
Assigned To:                ajosey
====================================================================== 
Project:                    1003.1(2008)/Issue 7
Issue ID:                   375
Category:                   Shell and Utilities
Type:                       Enhancement Request
Severity:                   Objection
Priority:                   normal
Status:                     Under Review
Name:                       David A. Wheeler 
Organization:                
User Reference:              
Section:                    test 
Page Number:                3224-3225 
Line Number:                107503-107513 
Interp Status:              --- 
Final Accepted Text:         
====================================================================== 
Date Submitted:             2011-02-07 18:34 UTC
Last Modified:              2016-09-22 08:42 UTC
====================================================================== 
Summary:                    Extend test/[...] conditionals: ==, <, >, -nt, -ot,
-ef
======================================================================
Relationships       ID      Summary
----------------------------------------------------------------------
has duplicate       0000762 Add &quot;==&quot; as synonym for &quot...
related to          0000813 Utility numeric argument syntax require...
====================================================================== 

---------------------------------------------------------------------- 
 (0003389) stephane (reporter) - 2016-09-22 08:42
 http://austingroupbugs.net/view.php?id=375#c3389 
---------------------------------------------------------------------- 
Re: http://austingroupbugs.net/view.php?id=375#c3387
> - *not* quote the ERE operators (.*?+[]{}()|$^) if we want them
> to retain their special ERE significance. You'll notice that
> several of those (()|) can't be in WORD
[...]
> - to remove the special meaning of those ERE operators, we can
> use double quotes, single quotes, backslash or $'...' but not
> when they're inside [...].

Actually, I hadn't realised ksh93's was so broken so the above
is incorrect. In ksh93, quotes other than backslash only escape
the ERE operators that also are wildcard operators (?*[]()|&),
not ^$.+, as in [[ a =~ "." ]] returns true (so does r=.; [[ a =
"$r" ]]).

And [[ "\\" =~ ["?"] ]] (or any of the other glob operators in
place of ?) returns true like in old versions of bash for RE
operators.

It looks like internally ksh93 replaces [[ x =~ y ]] with [[ x =
~(E)y ]]. [[ a = ~(E)"." ]] also returns true, while [[ a = "?"
]] returns false. 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2011-02-07 18:34 dwheeler       New Issue                                    
2011-02-07 18:34 dwheeler       Status                   New => Under Review 
2011-02-07 18:34 dwheeler       Assigned To               => ajosey          
2011-02-07 18:34 dwheeler       Name                      => David A. Wheeler
2011-02-07 18:34 dwheeler       Section                   => test            
2011-02-07 18:34 dwheeler       Page Number               => 3224-3225       
2011-02-07 18:34 dwheeler       Line Number               => 107503-107513   
2011-02-07 18:49 dwheeler       Note Added: 0000666                          
2011-02-07 20:23 Don Cragun     Interp Status             => ---             
2011-02-07 20:23 Don Cragun     Note Added: 0000667                          
2011-02-07 20:23 Don Cragun     Severity                 Editorial => Objection
2011-02-07 20:23 Don Cragun     Type                     Clarification Requested
=> Enhancement Request
2011-02-07 21:56 dwheeler       Note Added: 0000668                          
2011-02-07 22:20 Don Cragun     Description Updated                          
2011-02-07 22:20 Don Cragun     Desired Action Updated                       
2011-02-07 22:22 Don Cragun     Note Edited: 0000667                         
2011-02-07 22:50 dwheeler       Note Added: 0000669                          
2011-02-07 23:13 eblake         Note Added: 0000670                          
2011-03-08 03:15 dwheeler       Note Added: 0000688                          
2011-04-24 13:16 jsonn          Note Added: 0000754                          
2011-04-24 19:01 dwheeler       Note Added: 0000755                          
2011-04-24 21:48 jsonn          Note Added: 0000756                          
2011-04-25 20:45 dwheeler       Note Added: 0000758                          
2011-04-26 09:25 markh          Note Added: 0000759                          
2011-04-26 09:57 wpollock       Note Added: 0000760                          
2011-04-26 10:36 jsonn          Note Added: 0000761                          
2011-09-22 08:59 ajosey         Note Added: 0000967                          
2011-09-25 00:36 dwheeler       Note Added: 0000974                          
2011-09-25 18:51 gber           Note Added: 0000975                          
2011-09-28 07:09 olof           Issue Monitored: olof                        
2011-11-15 17:26 dwheeler       Note Added: 0001011                          
2011-11-15 19:25 ajosey         File Added: Extendingshellconditionals.pdf      
             
2011-11-15 19:27 ajosey         File Added: Extendingshellconditionals.txt      
             
2011-11-15 19:30 ajosey         Note Added: 0001013                          
2011-11-23 23:49 dwheeler       File Added:
Extendingshellconditionals-2011-11-23.pdf                    
2011-11-23 23:50 dwheeler       File Added:
Extendingshellconditionals-2011-11-23.odt                    
2011-11-23 23:50 dwheeler       File Added:
Extendingshellconditionals-2011-11-23.txt                    
2011-11-23 23:57 dwheeler       Note Added: 0001044                          
2011-11-28 15:50 geoffclare     Note Added: 0001060                          
2011-11-28 15:51 geoffclare     File Added:
Extendingshellconditionals-2011-11-28.odt                    
2011-11-28 15:52 geoffclare     File Added:
Extendingshellconditionals-2011-11-28.pdf                    
2011-11-28 16:10 geoffclare     Note Edited: 0001060                         
2011-11-28 16:38 dwheeler       Note Added: 0001061                          
2011-11-29 03:26 Roger Marquis  Note Added: 0001064                          
2011-11-29 03:27 Roger Marquis  Note Edited: 0001064                         
2011-11-29 04:51 dwheeler       Note Added: 0001065                          
2011-12-29 19:01 antoinel       Issue Monitored: antoinel                    
2013-10-10 01:15 dwheeler       Note Added: 0001869                          
2013-10-12 04:08 dwheeler       Note Added: 0001881                          
2013-10-24 15:15 geoffclare     File Added:
Extendingshellconditionals-2013-10-24.odt                    
2013-10-24 15:16 geoffclare     File Added:
Extendingshellconditionals-2013-10-24.pdf                    
2013-10-24 15:23 geoffclare     Note Added: 0001944                          
2013-10-25 10:26 geoffclare     Note Added: 0001945                          
2013-10-31 15:55 Don Cragun     Relationship added       has duplicate 0000762
2013-11-01 15:36 ranjit         Note Added: 0001950                          
2013-11-01 19:09 dwheeler       Note Added: 0001953                          
2013-11-01 19:43 shware_systems Note Added: 0001954                          
2013-11-10 14:46 dwheeler       Note Added: 0001979                          
2013-11-22 22:13 dwheeler       Note Added: 0002017                          
2013-11-29 18:56 dwheeler       File Added:
Extendingshellconditionals-2013-11-29.odt                    
2013-11-29 18:57 dwheeler       File Added:
Extendingshellconditionals-2013-11-29-track-changes.pdf                    
2013-11-29 18:58 dwheeler       File Added:
Extendingshellconditionals-2013-11-29.pdf                    
2013-11-29 19:11 dwheeler       Note Added: 0002031                          
2013-11-29 19:24 dwheeler       Note Added: 0002032                          
2013-12-01 22:52 jilles         Note Added: 0002033                          
2013-12-02 08:59 shware_systems Note Added: 0002034                          
2013-12-02 11:15 shware_systems Note Added: 0002035                          
2013-12-08 22:06 dwheeler       Note Added: 0002052                          
2013-12-08 22:48 dwheeler       Note Added: 0002053                          
2013-12-08 23:05 dwheeler       Note Added: 0002054                          
2013-12-09 01:32 dwheeler       File Added:
Extendingshellconditionals-2013-12-08.odt                    
2013-12-09 01:33 dwheeler       File Added:
Extendingshellconditionals-2013-12-08.pdf                    
2013-12-09 01:35 dwheeler       Note Added: 0002055                          
2013-12-09 06:55 shware_systems Note Added: 0002056                          
2013-12-10 04:46 dwheeler       Note Added: 0002059                          
2013-12-10 04:52 dwheeler       File Added:
Extendingshellconditionals-2013-12-09.odt                    
2013-12-10 04:53 dwheeler       File Added:
Extendingshellconditionals-2013-12-09.pdf                    
2013-12-10 09:41 shware_systems Note Added: 0002060                          
2013-12-10 16:08 dwheeler       Note Added: 0002061                          
2013-12-10 22:36 jilles         Note Added: 0002063                          
2013-12-11 00:46 dwheeler       Note Added: 0002064                          
2013-12-11 00:48 shware_systems Note Added: 0002065                          
2013-12-11 00:58 dwheeler       Note Added: 0002066                          
2013-12-12 01:38 shware_systems Note Added: 0002068                          
2013-12-12 06:04 shware_systems Note Edited: 0002068                         
2014-03-06 17:08 eblake         Relationship added       related to 0000813  
2014-03-06 17:15 geoffclare     Note Added: 0002176                          
2014-03-06 19:13 ranjit         Note Added: 0002177                          
2014-03-06 21:22 shware_systems Note Added: 0002178                          
2014-03-07 15:46 dwheeler       Note Added: 0002179                          
2014-03-07 15:52 dwheeler       Note Added: 0002180                          
2014-03-11 14:52 shware_systems Note Added: 0002181                          
2014-03-12 23:05 dwheeler       Note Added: 0002182                          
2014-03-14 13:25 ranjit         Note Added: 0002186                          
2014-10-13 16:44 rhansen        Note Added: 0002418                          
2014-10-13 16:52 geoffclare     Note Added: 0002419                          
2014-10-13 16:55 dwheeler       Note Added: 0002420                          
2014-10-13 17:54 rhansen        Note Added: 0002421                          
2016-09-19 21:46 stephane       Note Added: 0003382                          
2016-09-20 17:16 shware_systems Note Added: 0003383                          
2016-09-20 20:34 stephane       Note Added: 0003384                          
2016-09-20 21:03 stephane       Note Added: 0003385                          
2016-09-20 21:07 stephane       Note Edited: 0003385                         
2016-09-21 07:35 shware_systems Note Added: 0003386                          
2016-09-21 10:20 stephane       Note Added: 0003387                          
2016-09-21 22:44 shware_systems Note Added: 0003388                          
2016-09-22 08:42 stephane       Note Added: 0003389                          
======================================================================


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