I can't do it precisely if I remove letters from the base58 bitcoin addresses are invalid
what do you mean by that?
you can't just simply remove/change a letter and expect it still a valid address
no pattern but address with certain letter or base 58 - 10 characters
as said before, regex (regular expression) will do the job
you can use regex to choose only certain alphabet letters or numbers, either pattern or random
can you give us an example of full bitcoin address that you want? or certain criterias?
we can then give you the appropriate regex to use with the vanitygen