What is the correct regular expression for an email address?

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.

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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

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正则表达式说这个匹配约99％

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?

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The definitive answer? Or the normal answer?

I ask because the formal email address specification allows all sorts of weird things (parenthesis, quoted phrases, etc) that most people don't bother to account for.

See this page for a list of both comprehensive and normal regex'es.

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