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Regular Expression - allow emails with period in the name.

I have this RegExp:
var reg = new RegExp("^[0-9a-zA-Z]+@[0-9a-zA-Z]+[\.]{1}[0-9a-zA-Z]+[\.]?[0-9a-zA-Z]+$");

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But  i need to allow email addresses like some.guy@gmail.com

Right now this kind of email is rejected.  I'm guessing _ would also be rejected.

Any ideas on what I need to change?  I was thinking:
var reg = new RegExp("^[0-9a-zA-Z.]+@[0-9a-zA-Z]+[\.]{1}[0-9a-zA-Z]+[\.]?[0-9a-zA-Z]+$");

but i don't want to take down the contact form if i'm wrong.

Thanks for your help!!!
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2 Solutions
Your change would work for your stated purpose,
although it will still reject valid email addresses such as
The Fred and Barney Comedy Team <fred&barney@stonehenge.com>

By the way the \ and {1} in your expression are unnecessary
Terry WoodsIT GuruCommented:
If you'd like to match the regex used by HTML5, I did a video tutorial on why you might like to use it: http://www.experts-exchange.com/Programming/Languages/Scripting/PHP/VP_245.html

The pattern is:

Open in new window

Sourced from:
That still rejects some valid email addresses, although addresses with quoted strings, comments, and Unicode may be less common.
slightlyoffAuthor Commented:
Thank you both for your help!

I will be giving it a try this week and see what happens.

Thanks again!
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