Little sugdestion
#1
Example:
I know that password dontains between 2 and 5 digits, rest are letters. 
Password length is 16 caracters,
Is there any rule which i can use that leinght of password is known and i can set number of large caracters and number of digits. 

Or at least give me a hint, how to solve this little problem.
#2
https://hashcat.net/wiki/doku.php?id=mask_attack ?

Specifically, a list of multiple masks, generated with policygen from the PACK toolkit or similar.
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