What is the correct regular expression for an email address? [duplicate]

Question

Duplicate: Using a regular expression to validate an email address

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There seem to be an awful lot of different variants on this on the web and was wondering if there is a definitive answer?

Preferably using the .net (Regex) dialect of regular expressions.

Answer 1

This question has been asked and answered several times:

Using a regular expression to validate an email address

Why are people using regexp for email and other complex validation?

Regexp recognition of email address hard?

Specifically related to .NET:

Validating e-mail with regular expression VB.Net