> maybe I do not fully follow your example, but wouldn't you instead of:
>
> time D="${C//\[+([0-9])\]=}" # rm '[<subscr>]='
>
> want:
>
> time D="${C//\[[0-9]*\]=}" # rm '[<subscr>]='
this would also find [!asd]. And there are other possibilities.
but that was not my problem / question.
> your example copies a lot to D and thats what takes time, I guess.
... but only if _extended_ pattern matching is used, see my examples. Why is
extended pattern matching so slow as compared to simple pattern matching.
That's the question.
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