Regular expression for email, why doesn't it work?

Possible Duplicate:
What is the best regular expression for validating email addresses?

I've been trying to do some regex for email filtering.

Allowed

anystring@example.com
any.string@example.com
a@example.com

Not allowed

any.st.ring@example.com
.a@example.com
a.@example.com
@example.com

This one accepts all allowed... but also a.@example.com

^([a-zA-Z0-9]+[.]?){1,2}@([a-zA-Z0-9]+.)+(com)$

This one accepts all allowed... except a@example.com !

Added [^.] before @

^([a-zA-Z0-9]+[.]?){1,2}[^.]@([a-zA-Z0-9]+.)+(com)$

What am I missing here?

---

^[a-zA-Z0-9]+(.[a-zA-Z0-9]+)?@([a-zA-Z0-9]+.)+com$ will accept your 'allowed' emails and reject the others.

Naturally, that will not match all generally valid emails. See http://www.regular-expressions.info/email.html for a discussion on email regular expressions.

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