Parsing out numbers

Trying to parse out the number strings into its own columns with this expression:
WITH T as
(SELECT '53-2010-2-101' test_string FROM DUAL union all
SELECT '2219-2010-3-22' FROM DUAL union all
SELECT '236350-2010-4-3' FROM DUAL)
SELECT SUBSTR(test_string,INSTR(test_string,'-')-2) stu_id,   --This is incorrect
SUBSTR(test_string,INSTR(test_string,'-',1,1)+1,4) fiscal_yr,
SUBSTR(test_string,INSTR(test_string,'-',1,2)+1,1) sess,
SUBSTR(test_string,INSTR(test_string,'-',1,3)+1,5) sch_id
FROM THaving problems with stu_id. How to count backwards with substr and instr? The results should look like so:
STU_ID                         FISCAL_YR                     SESS                                        SCH_ID
53                             2010                           2                                           101
2219                         2010                           3                                            22
236350                         2010                           4                                             3Thanks

Would it be something like this?
WITH T as
(SELECT '53-2010-2-101' test_string FROM DUAL union all
SELECT '2219-2010-3-22' FROM DUAL union all
SELECT '236350-2010-4-3' FROM DUAL)
-- end of sample data
SELECT substr(test_string, 1, instr(test_string, '-') - 1) stu_id,
        substr(test_string, instr(test_string, '-', 1, 1) + 1, 4) fiscal_yr,
        substr(test_string,
               instr(test_string, '-', 1, 2) + 1,
               instr(test_string, '-', 1, 3) - instr(test_string, '-', 1, 2) - 1) sess,
        substr(test_string, instr(test_string, '-', 1, 3) + 1, 5) sch_id
   FROM tSample execution:
SQL> WITH T as
2 (SELECT '53-2010-2-101' test_string FROM DUAL union all
3   SELECT '2219-2010-3-22' FROM DUAL union all
4   SELECT '236350-2010-4-3' FROM DUAL)
5   -- end of sample data
6   SELECT substr(test_string, 1, instr(test_string, '-') - 1) stu_id,
7          substr(test_string, instr(test_string, '-', 1, 1) + 1, 4) fiscal_yr,
8          substr(test_string,
9                 instr(test_string, '-', 1, 2) + 1,
10                 instr(test_string, '-', 1, 3) - instr(test_string, '-', 1, 2) - 1) sess,
11          substr(test_string, instr(test_string, '-', 1, 3) + 1, 5) sch_id
12     FROM t;
STU_ID          FISCAL_YR SESS            SCH_ID
53              2010      2               101
2219            2010      3               22
236350          2010      4               3
SQL> With regular expressions would look something like this:
WITH T as
(SELECT '53-2010-2-101' test_string FROM DUAL union all
SELECT '2219-2010-3-22' FROM DUAL union all
SELECT '236350-2010-4-3' FROM DUAL)
SELECT regexp_substr(test_string, '\d+', 1, 1) stu_id,
        regexp_substr(test_string, '\d+', 1, 2) fiscal_yr,
        regexp_substr(test_string, '\d+', 1, 3) sess,
        regexp_substr(test_string, '\d+', 1, 4) sch_id
   FROM t;Edited by: fsitja on Jan 28, 2010 6:07 PM

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Steve (guest) wrote:
: Oracle XML Team wrote:
: : Steve Coffman (guest) wrote:
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small
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