What will this GREP expression do?

[noobnaiks]

Found a stray GREP style in my document and unsure what this does. Appreciate your help decoding.

(?s)\[.+?\]

[Jongware · Accepted solution]

It applies a character style of choice to anything between [square brackets], including the brackets.

The code "(?s)" at the front is a dummy; it does not work inside GREP Styles.

[Kasyan Servetsky · Accepted solution]

For deciphering GREP, use What the Grep script, written by Jongware.

[Jongware]

Heh heh 😀 was not on my computer at the mo' but thanks for mentioning it!

[noobnaiks]

Thanks _Jongware_ and Kasyan_Servetsky! No wonder I couldn't find anything on (?s) anywhere. New to GREP.