>>>>

"^([0-9a-zA-Z]+[-._+&])*[0-9a-zA-Z]+@([-0-9a-zA-Z]+[.])+[a-zA-Z]{2,6}$"

according to Craig Boyd's blog http://www.sweetpotatosoftware.com/spsblog/2006/01/04/ARegularExpressionsLibraryForVisualFoxPro.aspx
>>>
>>>I tried the pattern suggested by Sergey in this thread and it works fine and much simpler. However, I haven't tested it too thorough yet - may be that pattern is too generous.
>>
>>According to what Craig said, the pattern I presented is the "official" version.
>
>This pattern does not work with the valid e-mails I have.
>
>FLastName@CompanyName-mtn.com (the company name includes -mtn)

I notice that Craig's blog entry is from 2006, so I guess something may have changed in the meantime.

Update: A test with the shown pattern returned true for your email address.