Reg expression to block 16 digit number

I have nextcloud file access control flow installed. Right now, I am trying to block any file that its name contains 16 or more numbers. However, when I use this expression /[0-9]{16}/ It blocks files that have more than 16 digits. Can you please tell me what I have wrong since I am new to this service.

Regular expressions are not Nextcloud specific and are used by many other commands. Aunt G. can show you many examples how tobuild and use them :wink:

To block 16 or more digits in a row, I would use this regular expression: “/[0-9]{16,}/