Need help with this sql query

Question

the following query returns me the correct no of rows:
select col1 from tab1 where
col1 like '%'||chr(32)||'%';
but i need to use my query in the following form and it doesn't return any row:
select col1 from tab1 where
col1 IN ('%'||chr(32)||'%');
what am I doing worng?
thanks in advance.

Answer 1

Or in 10g (just recycling another example):
WITH t AS (SELECT 'OPTI1457' || CHR(32) col1
             FROM dual
            UNION
           SELECT 'OPT123' || CHR(9)
             FROM dual
            UNION
           SELECT 'OPTIM12345'
             FROM dual
SELECT t.*
  FROM t
WHERE REGEXP_LIKE(t.col1, CHR(32) || '|' || CHR(9))
;       C.