REGEX Match [WildCard] but not [WildCard].[WildCard]

Using C# Regex

Example

Simple Input: [testA].[max] [testB]

Match: [testB]

Input: 5/[test1] [test2].[max] [test3]*2 [min]

Match:[test1] [test3] [min]

Definition

I want to match anything with like [Whatever] but not match [Whatever].[(min|max|mean|sum|median)]

Attempt

This works sort of it does not match [min] on its own.

(?!\[((\w|[.])+)\]\.\[(min|max|mean|sum|median)\])\[((?!min|max|mean|sum|median).+?)\]