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

Groups > linux.debian.user > #268016

Re: bash parameter expansion "doesn't like" dots?

Show all headers | View raw

On 04/03/2024 10:07, David Wright wrote:
> On Sun 03 Mar 2024 at 17:58:53 (-0600), Albretch Mueller wrote:
>>   bash doesn't seem to like dots too close to brackets:
>>
>>   echo "${_VAR//[^0-9a-zA-Z.,_-]/}"
>>
>>   works fine.
>>
>> On 3/3/24, Albretch Mueller <lbrtchx@gmail.com> wrote:
>>> _VAR="admissions.piedmont.edu_files?trackid=wnm:1980&PDFfiller=what-is-the-second-fundamental-theorem-of-calculus(1).pdf"
>>>
>>> echo "${_VAR//[^a-zA-Z0-9_-]/}"
>>>
>>> echo "${_VAR//[^a-zA-Z0-9_-.]/}"
>                               ↑↑↑
> 
> That's a range, except that it isn't because it's written backwards.
> Check for yourself by testing with 9-0 instead of 0-9.
> 
> Cheers,
> David.
> 
So the problem isn't about dots, but the handling of the - which has to go last if it isn't to be treated as a range marker.

https://www.gnu.org/software/grep/manual/html_node/Character-Classes-and-Bracket-Expressions.html
says:

‘-’
     represents the range if it’s not first or last in a list or the ending point of a range. To make the ‘-’ a list item, it is best to put it last.

-- 
John

Back to linux.debian.user | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: bash parameter expansion "doesn't like" dots? Albretch Mueller <lbrtchx@gmail.com> - 2024-03-04 01:00 +0100
  Re: bash parameter expansion "doesn't like" dots? David Wright <deblis@lionunicorn.co.uk> - 2024-03-04 02:10 +0100
    Re: bash parameter expansion "doesn't like" dots? John Crawley <john@bunsenlabs.org> - 2024-03-04 04:10 +0100
      Re: bash parameter expansion "doesn't like" dots? David Wright <deblis@lionunicorn.co.uk> - 2024-03-04 21:30 +0100
        Re: bash parameter expansion "doesn't like" dots? John Crawley <john@bunsenlabs.org> - 2024-03-05 03:00 +0100
          Re: bash parameter expansion "doesn't like" dots? Greg Wooledge <greg@wooledge.org> - 2024-03-05 03:10 +0100
            Re: bash parameter expansion "doesn't like" dots? John Crawley <john@bunsenlabs.org> - 2024-03-05 03:30 +0100
              Re: bash parameter expansion "doesn't like" dots? Greg Wooledge <greg@wooledge.org> - 2024-03-05 04:00 +0100
                Re: bash parameter expansion "doesn't like" dots? David <bouncingcats@gmail.com> - 2024-03-05 06:30 +0100
                Re: bash parameter expansion "doesn't like" dots? Max Nikulin <manikulin@gmail.com> - 2024-03-05 12:40 +0100
            Re: bash parameter expansion "doesn't like" dots? Max Nikulin <manikulin@gmail.com> - 2024-03-05 03:40 +0100
              Re: bash parameter expansion "doesn't like" dots? John Crawley <john@bunsenlabs.org> - 2024-03-05 04:00 +0100

csiph-web