RFC-consistent regexp to match name@(subdomain.)*foo.bar

What is the regexp to match a set of email addresses within foo.bar like
    name@(subdomain.)*foo.bar
 
I'm using
    [a-z][^     ]*@([a-z][a-z0-9_-]*\.)*foo\.bar
 
i.e., name starts with an alpha and contains anything but white-space,
and subdomain starts with an alpha and contains only alphas, numerals,
and underscores & dashes.
 
But I suspect my assumptions are inaccurate regarding what is an
RFC-compliant, legitimate, email address.
Can someone supply a more appropriate regexp for matching email 
addresses within foo.bar and her subdomains?
 
Thank you for any assistance.
Best regards,
John Ruckstuhl