Count occurrences of character in a string using MySQL

Question

Example Words: a, akkka, akokaa, kokoko, kakao, oooaooa, kkako, kakaoa

I need the regexp witch gives words with 2 or less \'a\' but not the words without \'a\'

Answer 1

select *  
from table  
where  LENGTH(name) - LENGTH(REPLACE(name, 'a', '')) between 1 and 2

Updated to use between.