How to seperate numbers and characters in a column

Hi,
In my database i have a table named birth.DBA prior to me created a column with data type var char,for which data type number must be allocated.Both characters and numbers are entered into that column.now i have to change my data type into number.how can i do this.
My idea is to first separate numbers and characters in that column.But how can i do this.can u please suggest.

use regular expressions
SELECT regexp_replace('aa123','[[:digit:]]') from dual;
SELECT regexp_replace('aa123','[^[:digit:]]') from dual
hth
Marco

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talia wrote in message
news:[email protected]..
> How can I display special characters of NonEuropean languages (French,
> Italian, Spanish, German and Portuguese.) using import string
> mechanism

How to seperate numbers and characters in a column

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