row and column delimiting in oracle sql - sql

Question

I'm trying to create a sub-table to reference within a query; the data I need is a separate title and code within a CLOB field like this. Code and title are separated by the semicolon, and each pair is separated by a carriage return (represented by ~).
category
values
offender
S;Student~T;Teacher~O;Other
reporter
S;Student~T;Teacher~O;Other
I'd like to pull a table like this:
category
code
title
offender
S
Student
offender
T
Teacher
offender
O
Other
reporter
S
Student
reporter
T
Teacher
reporter
O
Other
I'm trying to wrap my head around how to use regexp_substr and can't seem to get it to work, it tells me the command isn't ended properly. The table name is "gen":
select
regexp_substr(replace(replace(replace(gen.values,CHR(10),'~'),CHR(13),'~'),';Please Select;*~~',''),'[^~]+',1,LEVEL) as code_title
from dual
CONNECT BY regexp_substr(code_title,'[^~]+',1,LEVEL) IS NOT NULL
where category = 'Offender';
Any advice (or other best practices for streamlining my query) is very much appreciated!

Answer 1

Table description:
SQL> desc test
Name Null? Type
----------------------------------------- -------- ----------------------------
CATEGORY VARCHAR2(20)
CVALUES CLOB
Table contents:
SQL> select * from test;
CATEGORY CVALUES
-------------------- ----------------------------------------
offender S;Student
T;Teacher
O;Other
reporter S;Student
T;Teacher
O;Other
Query:
SQL> with temp as
2 (select
3 category,
4 regexp_substr(cvalues, '[^' ||chr(10) ||']+', 1, column_value) val
5 from test cross join
6 table(cast(multiset(select level from dual
7 connect by level <= regexp_count(cvalues, chr(10)) + 1
8 ) as sys.odcinumberlist))
9 )
10 select category,
11 regexp_substr(val, '^\w') code,
12 regexp_substr(val, '\w+$') title
13 from temp;
CATEGORY CODE TITLE
-------------------- ---------- --------------------
offender S Student
offender T Teacher
offender O Other
reporter S Student
reporter T Teacher
reporter O Other
6 rows selected.
SQL>