does string contain a valid number

From: Michael Moore <michaeljmoore_at_gmail.com>
Date: Tue, 18 Aug 2009 11:19:16 -0700
Message-ID: <26fdee6e0908181119w6f2da2a5u6d0ef6b3a82676c1_at_mail.gmail.com>

What is the best way to see if a string contains a valid number? 10gR2

thanks,
Mike

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Received on Tue Aug 18 2009 - 13:19:16 CDT