Mask setup

[JulioQc]

Hello,

I'm trying to specify a particular mask for brute force. I currently use the following argument:

Code:

?u?d ?1?1?1?1?1?1?1?1

8 digits, uppercase only, all numerical

However, I know for a fact the password has a maximum/minimum of 4 upper case letters and 4 numerical. They can be anywhere in this 8 digit sequence.

Example:

Code:

A56BG76Y
R3T123GE
5F3TY5Q8

How can I specify this? Thanks