Query not giving poper output when using cursor

Question

I have a PL/SQL block where I am trying to get the count of filled and not filled values for each column of a table i.e. "demo_table".

select  count(*) into v_count from demo_table 
where owner='OWNER_1' and(rec.COLUMN_NAME is   null OR 
REGEXP_LIKE(rec.COLUMN_NAME,'^-$') OR REGEXP_LIKE (rec.COLUMN_NAME,'^-$'));

I am displaying the v_count through dbms_output. But I am not able to get the count.

This is what I am doing:

declare
  CURSOR C1 IS
  SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS
  WHERE TABLE_NAME ='demo_table';

  v_count number(10);
begin    
  for rec in c1 loop
    dbms_output.put_line(rec.COLUMN_NAME);
    select count(*) into v_count from demo_table
    where owner='OWNER_1'
    and(rec.COLUMN_NAME is null
      OR REGEXP_LIKE(rec.COLUMN_NAME,'^-$')
      OR REGEXP_LIKE (rec.COLUMN_NAME,'^-$'));
    dbms_output.put_line(v_count);
  end loop;   
  dbms_output.put_line(v_count);    
end;