initials_mi (9/18/2014)
I came across the same situation and I found the working solution for it.Here is the link:
http://www.ittutorials.in/source/sql/sql-function-to-extract-only-numbers-from-string.aspx
A set-based solution that does not use a loop is the faster way to go. In addition to what Jeff posted you could use the function discussed here: http://www.sqlservercentral.com/Forums/Topic1585850-391-2.aspx
or PatExclude8K (referenced in my signature)
-- Itzik Ben-Gan 2001