Adding leading zeros to a non-numeric field

Hello
I have an application which currently does not validate a field and the user can enter any string on this specific field. The customer wants me to write a view to bring information from a child table which uses the free format field as the key to join.
Example, the field A is free format, but, we would expect something like "0000001-AB', however the users are inputing '1' or '001-AB'. The client wants to see these cases to be displayed (and joined) as '0000001-AB'. The format is 7 digits + '-' + two digit code.
I would like to know, how can I display this on a view, since most of my cases are '1' or '001-AB'. But there are others with crazy things like '1+2+3+4' and these cases are giving me an error of "invalid number" since I am using the TO_NUMBER function so far.
Thanks!
Eduardo Ferrari

WITH t AS (SELECT '1' txt FROM DUAL
 UNION
 SELECT '001-AB' FROM DUAL
 UNION
 SELECT '1+2+3+4' FROM DUAL)
SELECT CASE
 WHEN LENGTH ( (REGEXP_REPLACE (txt, '[-AB]') || '-AB')) < 10
 THEN
 LPAD ( (REGEXP_REPLACE (txt, '[-AB]') || '-AB'), 10, '0')
 ELSE
 REGEXP_REPLACE (txt, '[-AB]') || '-AB'
 end txt
from t
TXT
0000001-AB
0000001-AB
1+2+3+4-ABunion
Edited by: pollywog on Nov 10, 2010 3:41 PM
Edited by: pollywog on Nov 10, 2010 3:53 PM

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Can anyone please provide a Function that will do the following:
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Sure use the function CONVERSION_EXIT_ALPHA_INPUT, this will add leading zeros to a character based field of any length.
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Message was edited by:
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Adding leading zeros to a non-numeric field

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