Can’t generate a regular expression

I’m trying to generate a regular expression to detect any string that :

  • Starts with the [
  • Ends with ]
  • Contains any word or number or space

Example : [Maxsens8 Innovations]

I’m using : https://regex101.com

I create this regular expression : ^[[a-zA-Z0-9]]$

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This regular expression does not match to expressions that i’m looking for and i thing the problem

is about the last character .

I will be gratefull if someone explain to me how to generate to right regular expression that

detect strings like : [Maxsens Innovations] [Verifik8] [Divoluci] …