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From: Dmitry Goncharov <dgoncharov@users.sf.net>
Newsgroups: gnu.bash.bug
Subject: Re: Incorrect example for `[[` command.
Date: Sat, 21 Sep 2019 14:55:09 -0400
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To: Ilkka Virta <itvirta@iki.fi>
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On Sat, Sep 21, 2019 at 12:34:39PM +0300, Ilkka Virta wrote:
> [[:space:]]*?(a)b  isn't a well-defined POSIX ERE:
> 
>    9.4.6 EREs Matching Multiple Characters
> 
>    The behavior of multiple adjacent duplication symbols ( '+', '*', '?',
>    and intervals) produces undefined results.
> 
> https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/basedefs/V1_chap09.html

This is unfortunate.
*? and +? are widely used not greedy regexes.

regards, Dmitry