Split a String which do not have a delimiter in Oracle - sql

Question

I have been beating my head around a problem. Following is the input string
1034536455702130340053769240340002208520191202134036
What I need to do is split this string into the following
03453645570
03400537692
03400022085
Here, every string that needs to get picked starts with a '03'.
I can do it with a PL/SQL code, by picking each substring starting from a '03' in a loop, then concatenating each value after removing extra characters from left and right and getting only 11 characters in each iteration. And then use REGEXP_SUBSTR to get desired result. However, this approach involves too much code. Is there a way by which this can be achieved using an SQL query?
SELECT UPPER (
REGEXP_SUBSTR ('03453645570,03400537692,03400022085',
'[^,]+',
1,
LEVEL))
AS VAL
FROM DUAL
CONNECT BY REGEXP_SUBSTR ('03453645570,03400537692,03400022085',
'[^,]+',
1,
LEVEL)
IS NOT NULL

Answer 1

You can use your existing code with the original input string, and just change the regex to match 03 followed by 9 digits:
SELECT REGEXP_SUBSTR ('1034536455702130340053769240340002208520191202134036',
'03[0-9]{9}',
1,
LEVEL)
AS VAL
FROM DUAL
CONNECT BY REGEXP_SUBSTR ('1034536455702130340053769240340002208520191202134036',
'03[0-9]{9}',
1,
LEVEL)
IS NOT NULL
Output
VAL
03453645570
03400537692
03400022085
Demo on dbfiddle

Answer 2

Using #Nicks solution. Following is the code that I have used to optimize it. I have evaluated only 1k records and it takes less than 1 seconds. I hope it helps.
--Table to store all sorts of strings
INSERT INTO TBL_SCRM_MSISDN
SELECT '0342244357903452274515236320191201091147' NUMBERS FROM DUAL
UNION
SELECT '03457064700420191201124242' FROM DUAL
UNION
SELECT '03414221723620191201130431' FROM DUAL
UNION
SELECT '1034536455702130340053769240340002208520191202134036' FROM DUAL;
-- Table used to store unique values
create table TBL_MSISDN
(
msisdn VARCHAR2(500)
);
--Using a loop to evaluate a single value one at a time
BEGIN
EXECUTE IMMEDIATE 'TRUNCATE TABLE TBL_MSISDN';
FOR C IN
(
SELECT * FROM TBL_SCRM_MSISDN
)
LOOP
INSERT INTO TBL_MSISDN
SELECT REGEXP_SUBSTR (C.NUMBERS,
'03[0-9]{9}',
1,
LEVEL)
AS VAL
FROM DUAL
CONNECT BY REGEXP_SUBSTR (C.NUMBERS,
'03[0-9]{9}',
1,
LEVEL) is not null;
END LOOP;
commit;
END;
/
SELECT * FROM TBL_MSISDN WHERE MSISDN IS NOT NULL;

Answer 3

Try Below query
select trim(regexp_substr('1$03453645570213$034005376924$0340002208520191202134$036','[^$]+', 1, level) ) value, level
from dual
connect by regexp_substr('103453645570213$034005376924$0340002208520191202134$036', '[^$]+', 1, level) is not null
order by level;