[] 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
--
Yukihiro Nakadaira - [email protected]
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