Looking to write a rule to replace digits

[pand0ra]

Code:

hashcat --stdout -a 3 -o dict.txt Password?d?d?d
hashcat --stdout -a 3 -o dict.txt My?d?d?dPassword
hashcat -m 14800 -a 0 -w 3 hash.txt dict.txt

Ya, that isn't quite the goal. I'm trying to create a rule file that can identify digits and go through all combinations of digits.