Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > gnu.bash.bug > #15388 > unrolled thread

Re: Incorrect example for `[[` command.

Back to article view | Back to gnu.bash.bug

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: Incorrect example for `[[` command. Ilkka Virta <itvirta@iki.fi> - 2019-09-21 12:34 +0300

#15388 — Re: Incorrect example for `[[` command.

On 21.9. 03:12, hk wrote:
> Thanks for the reply. I was wrong in my report. It does match values like
> aab and  aaaaaab  in its original form.

In some systems, yes. (It does that on my Debian, but doesn't work at 
all on my Mac.)

> It is syntatically correct as a regular expression. 

[[: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


-- 
Ilkka Virta / itvirta@iki.fi

[toc] | [standalone]

Back to top | Article view | gnu.bash.bug

csiph-web