Något sånt här, kanske; min CTE är resultatet av din GET_DDL.
with test (col) as
(select q'[
CREATE OR REPLACE TRIGGER "owner"."trigger_delete" BEFORE DELETE ON roles FOR EACH ROW
BEGIN
DBMS_APPLICATION_INFO.read_client_info (acct_utils.trigger_enabled);
IF acct_utils.trigger_enabled <> 'F' THEN
INSERT INTO delete_table (ID, key, object, type, keytype, objecttype, created, deleted, deletedby) VALUES(
:old.id,
:old.key,
'delete',
null,
:old.keytype,
null,
:old.whencreated,
(CURRENT_TIMESTAMP AT TIME ZONE 'GMT'),
SYS_CONTEXT('TMCtx', 'USERKEY')
);
END IF;
END trigger_delete;]'
from dual)
select substr(col,
instr(upper(col), 'INSERT INTO DELETE_TABLE'),
--
instr(col, ';', instr(upper(col), 'INSERT INTO DELETE_TABLE'), 1) -
instr(upper(col), 'INSERT INTO DELETE_TABLE') + 1
) result
from test;