On 2022-11-13 07:09, Ray Andrews wrote:
> Roman:
>
>             cc=( ${(M)cc:#*$~zsh_case${filter}*} )
>
> I've been applying that in some other functions but I need a variation 
> that will erase non-matching lines but leave them as blanks so that 
> array indexes do not change.  Reason being that a subsequent merge 
> with another array will happen and indexes must mesh.  I'm doing it 
> right now by using a dummy string as replacement for a non-match and 
> then combining the arrays and then deleting the dummies but that's 
> obviously clumsy.

Stéphane Chazelas 
<https://unix.stackexchange.com/users/22565/st%c3%a9phane-chazelas> over 
at StackExchange offers this:

         cc=( "${cc[@]/#%^*$~zsh_case${filter}*}" )

... and it seems to do exactly what I want.  I understand the negation 
and the way the '[@]' and the outer quotes protect the length of the 
array, now I just need to understand the '#%' anchors -- but they are 
essential.


>
>
>