Quick search does not allow you to search for specific characters.

[pentopen]

If you want a quick scan to search for files with the string '(', ')','[', ']' in the file name, you can't search them.
XnView MP Windows
Version 0.98.3 64bits (May 6 2021)

Libformat version 7.80

[michel038]

Quick search can use "regex" syntax... You can perhaps use \ character to escape special characters like \[ or \(

[pentopen]

Quick search can use "regex" syntax... You can perhaps use \ character to escape special characters like \[ or \(

Thank you for letting me know the new way.