I have used this to good effect
function isEmail($email)
{
if
(eregi("^[a-z0-9]+([-_\.]?[a-z0-9])+@[a-z0-9]+([-_\.]?[a-z0-9])+\.[a-z]{2,4}",$email))
{
return TRUE;
} else {
return FALSE;
}
}//end function
I often have a '+' in my email address (which is perfectly valid) and
it really annoys me when a site refuses to accept it.
Didn't notice this before but that regex ignores valid TLD's too like .museum, .travel .. Probably not that common but certainly valid.
http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains
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