bash "extglob" needs to upgrade at least like zsh "kshglob"

[Hyunho Cho]

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Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2 -flto=auto -ffat-lto-objects -flto=auto
-ffat-lto-objects -fstack-protector-strong -Wformat
-Werror=format-security -Wall
uname output: Linux EliteBook 5.19.0-23-generic #24-Ubuntu SMP
PREEMPT_DYNAMIC Fri Oct 14 15:39:57 UTC 2022 x86_64 x86_64 x86_64
GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.2
Patch Level: 2
Release Status: release

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bash "extglob" almost unusable except with very tiny string.
there is no such problems in zsh "kshglob".

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# this is just for testing purposes.
$ foo=$( gcc -v --help 2> /dev/null | sed -En 's/^\s*(-[^ ]+).*/\1/p' )

# this is a simple work that just removes trailing spaces.
( in bash )$ time res=${foo%%+( )}
real    0m10.409s     # 10 seconds !
user    0m10.408s
sys     0m0.000s

( in zsh )$ setopt kshglob
( in zsh )$ res=${foo%%+( )}"
Done immediately.

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( in bash )$ res=${foo//*( )$'\n'*( )/$'\n'}
No hope

( in zsh )$ res=${foo//*( )$'\n'*( )/$'\n'}
Done almost immediately.