Phone number normalization: Any pre-existing libraries?

Question

I have a system which is using phone numbers as unique identifiers. For this reason, I want to format all phone numbers as they come in using a normalized format. Because I have

Answer 1

perl and rails examples

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http://validates-as-phone.googlecode.com/svn/trunk/README

http://www.perlmonks.org/?node_id=159645