regex to match repeated consonant

Question

How can I detect with a regex expression if the same consonant is repeated three times or more?

My idea is to match words like tttoo

Answer 1

The regex from answer higher [b-df-hj-np-tv-z])\1{2,}has a mistake ("y" is fogotten)

It should be [b-df-hj-np-tv-xz])\1{2,}