regex - How do i grep to find words which contain two z’s and also two a’s

Question

I want to find words which contain two z’s and also two a’s through a word list? Thank You

Answer 1

z.*z.*a.*a|z.*a.*z.*a|a.*z.*z.*a|z.*a.*a.*z|a.*a.*z.*z

or as Benjamin wrote in comments below, if you use piping you can simplify it to

grep 'z.*z' | grep 'a.*a'