Re: What is wrong with a regex?

[Leonid Isaev (ifax)]

On Fri, Feb 03, 2023 at 10:10:40PM -0600, Peng Yu wrote:
> That would be a syntax error as the return status 2 indicates.
> $ f=row.txt; [[ $f =~ ^row([0-9]*)(|_x)[.]txt$ ]]; echo $?
> 2

-----8<-----
I-orca--05:07-~-> f="row.txt"; [[ "$f" =~ ^row([0-9]*)(|_x)[.]txt$ ]]; echo $?; 
echo -E "${BASH_REMATCH[@]}"
0
row.txt
----->8-----
How did you get 2? Is this a new feature in bash? I get the above result in
bash 5.0.16(1)-release (ArchLinux) and 4.4.20(1)-release (AlmaLinux 8).

-- 
Leonid Isaev