How to get Numric value from a Char field in the database?

I have the following values in a column in Database.
COMP
GRADE
CANC
CANCELLED
Comp
Complete
INCOMP
NC
NS
85%
79
88 .... etc....
I have to take the value from this field if it is a Numeric other wise I have to ignore that value.
Please let me know how to handle this?
Thanks,
Lakshmi

Thanks for the inputs.
Here I want to take the value if it is numeric else I
will ignore that record.
Please let me know how to validate the data for a
Numeric value.
I don't want to stop my program by throwing these
exceptions.The sample code catches the exception. At that point you can do whatever you want (set a boolean to say the value is not a number, etc.) - the program does not stop.

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chris227 wrote:
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,regexp_substr( '(25,23,35,1)', '\d+', 1, 2) s2
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from dual
S1 S2 S3 S4
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t2.att_type= to_number(regexp_substr( '(25,23,35,1)', '\d+', 1, 1))Edited by: chris227 on 01.03.2013 08:00Sir,
I am using oracle 10g.
In the process of getting each number from the parm '(25,23,35,1)' , I also need the position of the number
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23 is at 2
35 is at 3
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