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Re:Mail::RFC822::Address: regexp-based address validation by ColinWright on Thursday April 16, 2015 @07:49AM (#9387254)

    Anyone who attempts to generate random numbers
    by deterministic means is, of course, living in
    a state of sin.

        -- John von Neumann
Modified to:

    Anyone who attempts to validate email addresses
    by a regular expression is, of course, living in
    a state of sin.

        -- Any sensible person
Re:Mail::RFC822::Address: regexp-based address validation by maxerickson on Thursday April 16, 2015 @07:57AM (#9387275)
How many '@' characters are possible in a valid address?

I don't care enough about offline email validation to figure it out carefully, but I have the idea it is one.