So should I upload this to CPAN? Did my coworker miss something close to this already on CPAN?

There are a lot of modules on CPAN dealing with e-mail addresses. Unfortunately, a lot of them are rubbish. You might want to take a look at the Perl Email Project if you haven't already.

If I understand you correctly (without specifically having worked through the regexen), you consider the following addresses to be equivalent: 

    everybody@example.com
    "Eve" <everybody@example.com> (Rybody)
    EveRybody+whatever@EXAMPLE.COM

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What about addresses with different top-level-domains, but equal second-level-domains? For example emails from/to 
    foo@gmail.com
    foo@gmail.net
    foo@gmail.com.au
    foo@gmail.at
    ...
    foo@gmail.za

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are all routed from/to the same mailbox. Are they equivalent to you?

In either case all you need is a tokeniser. It will allow you to compare exactly what it is you need to determine equivalency.

Some of the existing modules tokenise the addresses internally to some extent, but Email::Address also gives you nice accessors for the resulting tokens, so it would be my prime choice for solving what I perceive your problem to be.

In reply to Re: Practical e-mail address validation by everybody
in thread Practical e-mail address validation by tye

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