A NOTE has been added to this issue. 
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https://austingroupbugs.net/view.php?id=1546 
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Reported By:                calestyo
Assigned To:                
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Project:                    1003.1(2016/18)/Issue7+TC2
Issue ID:                   1546
Category:                   Base Definitions and Headers
Type:                       Enhancement Request
Severity:                   Editorial
Priority:                   normal
Status:                     Resolved
Name:                       Christoph Anton Mitterer 
Organization:                
User Reference:              
Section:                    9.3 Basic Regular Expressions 
Page Number:                N/A 
Line Number:                N/A 
Interp Status:              --- 
Final Accepted Text:        https://austingroupbugs.net/view.php?id=1546#c5738 
Resolution:                 Accepted As Marked
Fixed in Version:           
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Date Submitted:             2022-01-08 03:48 UTC
Last Modified:              2022-03-12 21:12 UTC
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Summary:                    BREs: reserve \? \+ and \|
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Relationships       ID      Summary
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related to          0000773 Summary: Add \+, \?, and \| to Basic Re...
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 (0005744) calestyo (reporter) - 2022-03-12 21:12
 https://austingroupbugs.net/view.php?id=1546#c5744 
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I've just noted David Wheeler's request #773.

Since this one here seems to have been accepted (?) in the sense of Geoff's
wording above... it might be worth to at least *consider* whether one
should go further, and simply implement 773?

- The above change, would already break compatibility if anyone used "\?",
"\+", and "\|" for any purpose other than those special meanings or literal
value.

- Previously, "\?", "\+", and "\|" would have been undefined behavior.

Is it known, whether any implementa 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2022-01-08 03:48 calestyo       New Issue                                    
2022-01-08 03:48 calestyo       Name                      => Christoph Anton
Mitterer
2022-01-08 03:48 calestyo       Section                   => 9.3 Basic Regular
Expressions
2022-01-08 03:48 calestyo       Page Number               => N/A             
2022-01-08 03:48 calestyo       Line Number               => N/A             
2022-01-28 11:21 mirabilos      Note Added: 0005636                          
2022-01-28 23:10 calestyo       Note Added: 0005639                          
2022-03-03 06:56 Don Cragun     Note Added: 0005731                          
2022-03-03 07:03 Don Cragun     Note Edited: 0005731                         
2022-03-10 17:09 geoffclare     Note Added: 0005738                          
2022-03-10 17:09 geoffclare     Interp Status             => ---             
2022-03-10 17:09 geoffclare     Final Accepted Text       =>
https://austingroupbugs.net/view.php?id=1546#c5738    
2022-03-10 17:09 geoffclare     Status                   New => Resolved     
2022-03-10 17:09 geoffclare     Resolution               Open => Accepted As
Marked
2022-03-10 17:10 geoffclare     Tag Attached: issue8                         
2022-03-10 17:44 calestyo       Note Added: 0005740                          
2022-03-12 21:01 Don Cragun     Relationship added       related to 0000773  
2022-03-12 21:12 calestyo       Note Added: 0005744                          
======================================================================


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