How to count the number of occurrences of a character in an Oracle varchar value?

Question

How can I count number of occurrences of the character - in a varchar2 string?

Example:

select XXX(\'123-345-566\', \'-\') from dual;
--         


        

Answer 1

select count(*)
from (
      select substr('K_u_n_a_l',level,1) str
      from dual
      connect by level <=length('K_u_n_a_l')
     )
where str  ='_';