Re: Bash parameter expansion (remove largest trailing match, remove largest leading match, pattern replacement) does not work

[Chet Ramey]

On 8/29/20 10:22 AM, Bruce Lilly wrote:

> Bash Version: 5.0
> Patch Level: 17
> Release Status: release
> 
> Description:
>        Bash parameter expansion (remove largest trailing match, remove
> largest leading match, pattern replacement) does not work
> Tested on OpenSUSE Leap 15.2, bash version 4.4.2.3(1)-release
> (x86_64-suse-linux-gnu)
> OpenBSD 6.7 bash version 5.0.17(1)-release (x86_64-unknown-openbsd6.7)
> NetBSD 9.0 bash version 5.0.17(1)-release (x86_64--netbsd)
> FreeBSD 12.1-STABLE bash version 5.0.18(2)-release (amd64-portbld-freebsd12.1)
> 
> Same results in all cases; this report posted from NetBSD 9.0.

There are a number of things wrong with this report; I think later messages
in the thread cover them. In short,

1. BRE bracket expression matching doesn't perform backslash-interpretation
   of anything, except to quote the next character, much less octal
   constant expansion;
2. You need `shopt -s extglob' to enable the pattern matching you want to
   use.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/