You may consider adding more sophisticated validation routines. Check my ruby snippet for possible inspiration: https://gist.github.com/571093 https://gist.gi

You may consider adding more sophisticated validation routines. Check my ruby snippet for possible inspiration: https://gist.github.com/571093 https://gist.github.com/571093 (IBAN, ISBN, ISSN, VATIN and some other numbers used in Poland)