Regex e-mail validating with Æ Ø Å

I need to validate a email address the best way, and I need to include some danish characters:

Æ Ø Å开发者_运维问答

æ ø å

My current regex is:

\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

How to incorporate the extra letters, and is there any optimizing that can be done to ensure the best handling of the e-mail address?

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Email address validation is hard with regular expressions.

A simple version could be:

^[ÆØÅæøåA-Za-z0-9._%+-]+@(?:[ÆØÅæøåA-Za-z0-9-]+\.)+[A-Za-z]{2,6}$

but this will fail on some valid addresses like Tim\ O'Reilly@microsoft.com or me@1.2.3.4, and match lots of invalid addresses like here@there.where.

In any way, you have to send an e-mail to it and get a response before you really know whether an address is valid or not.