put away characters in result of query

From: "T" <t@xxxxxxxxx>
Date: Fri, 23 Dec 2005 11:28:50 +0100

my select returns leter data

RN230006205
250051321RN
RN. 25 0051321

i need to put away characters(alfa characters and spaces), only numbers
could stay..

230006205
250051321
250051321

please

.

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