How to write the pattern in regular expression matching in Pl/SQL? - regex

Question

I have written a substring regular expression in Oracle. I am having a problem with the correct pattern matching. The substring query first fetches the ddl of the trigger into a string and then tries to separate the table's columns from it.
Trigger DDL
CREATE OR REPLACE TRIGGER "SHIVAMG"."DVJ_CI_CURRENCY_CD_L_IU"
BEFORE INSERT OR UPDATE ON CI_CURRENCY_CD_L
FOR EACH ROW
BEGIN
IF INSERTING THEN
IF (UPPER(:NEW.CURRENCY_CD) NOT LIKE 'ZZ%') THEN
INSERT INTO JUNITUSR.CI_CURRENCY_CD_L
(CURRENCY_CD,
LANGUAGE_CD,
DESCR,
VERSION)
SELECT :NEW.CURRENCY_CD,
:NEW.LANGUAGE_CD,
:NEW.DESCR,
:NEW.VERSION
FROM DUAL
WHERE NOT EXISTS
(SELECT 1
FROM JUNITUSR.CI_CURRENCY_CD_L B
WHERE B.CURRENCY_CD =:NEW.CURRENCY_CD AND
B.LANGUAGE_CD = :NEW.LANGUAGE_CD);
END IF;
END IF;
IF UPDATING THEN
IF (UPPER(:NEW.CURRENCY_CD) NOT LIKE 'ZZ%') THEN
UPDATE JUNITUSR.CI_CURRENCY_CD_L A
SET CURRENCY_CD =:NEW.CURRENCY_CD,
LANGUAGE_CD =:NEW.LANGUAGE_CD,
DESCR =:NEW.DESCR ,
VERSION =:NEW.VERSION
WHERE A.CURRENCY_CD = :OLD.CURRENCY_CD AND
A.LANGUAGE_CD =:OLD.LANGUAGE_CD;
END IF;
END IF;
EXCEPTION
WHEN OTHERS THEN
RAISE_APPLICATION_ERROR(-20001,'ERROR: <DVJ_CI_CURRENCY_CD_L_IU> ' || SQLERRM);
END;
ALTER TRIGGER "SHIVAMG"."DVJ_CI_CURRENCY_CD_L_IU" ENABLE"
Substring Query
SELECT REGEXP_SUBSTR((SELECT REGEXP_SUBSTR
(( select dbms_metadata.get_ddl('TRIGGER', 'DVJ_CI_CURRENCY_CD_L_IU' ) from dual), 'INSERT INTO(.*)+\)')FROM dual),'\((.*)\)') FROM DUAL;

Answer 1

I found the correct Substring query to gather the individual column names from the trigger code. It is as follows:
SELECT REGEXP_SUBSTR((SELECT REGEXP_SUBSTR((SELECT REGEXP_SUBSTR (( SELECT dbms_metadata.get_ddl( 'TRIGGER',trig_name,'CISADM') FROM dual),
'INSERT(\s|\n)+INTO[^\)]+\)',1,1,'n') FROM dual),'[\(](\s|\n|.)+[\)]')
FROM DUAL),'(\w)+',1,counter)INTO temp_col_name FROM dual;