How to make patterns?

Question

HTML

Help make patterns.
Here is the task:
Password - from 6 to 8 characters, Cyrillic and Latin, no consonants, at least 3 numeric characters, there should be no special characters, including spaces
I could make it without letters
:

Answer 1

Without consonants https://regex101.com/r/AzSZBH/3
Without vowels https://regex101.com/r/AzSZBH/2

^(?=[\dB-Zb-zБ-Ьб-ь]{6,8}$)(?!.*[IUOEiuoeОИЕЁЫУоиеёыуiuoe])(\D*\d){3}.*