Is trim() useful for splitting up a string that has a delimiter?

Hi all
below is an example of my data
Col 1
abc_ijk
a_xyz
pq_b
I need to split up abc_ijk into 'abc' and 'ikj' and store them into another table. Can i use trim? I know that i can specify the number of characters to split it up, but my number of characters for each row is different. how can i tell trim to remove everything after(including '_') so that i can get abc, as well as remove everything before(including '_') so that i can get ijk?

And in 10g you could use regular expressions ... (scnr)
WITH t AS (SELECT 'abc_ijk' col1
             FROM dual
            UNION
           SELECT 'a_xyz'
             FROM dual
            UNION
           SELECT 'pq_b'
             FROM dual
SELECT col1,
       REGEXP_SUBSTR(col1, '[a-z]+', 1, 1) fld1,
       REGEXP_SUBSTR(col1, '[a-z]+', 2, 1) fld2
FROM t;C.

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Is trim() useful for splitting up a string that has a delimiter?

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