Yukihiro Nakadaira wrote:

> [] inside \%[] doesn't work with new regex engine.
> 
> Steps to reproduce:
>   $ vim -u NONE
>   :echo match('a', '\%#=1\%[[a]]')
>   0
>   :echo match('a', '\%#=2\%[[a]]')
>   INTERNAL: Negative state char: -165
>   INTERNAL: Negative state char: -165
>   -1

Thanks for reporting this.

The \%[] item didn't support nesting at all.  Fortunately it's easy to
fix.  And then it will support anything (unlike the old engine).

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