> A line in my PHP script tests for bad email addresses with the
> following regular expression:
> ...
> if (!ereg("[EMAIL PROTECTED],5}$", $email))
> ...
>
> However, this expression evaluates email addresses like
> [EMAIL PROTECTED]" and "[EMAIL PROTECTED]" as incorrect.
> It's the subdomain or two dots after the @ sign that causes the
> problem. How can I change my expression above to allow email addresses
> with subdomains?
It is the two dots that is your problem. You're basically looking for
[EMAIL PROTECTED] with certain restraints on those *'s. What you want is
*@(*.)* with the (*.) able to repeat to allow subdomains. So you're
expression would look something like this...
"^[a-zA-Z0-9._-]+@([a-zA-Z0-9-]+\.)+[a-zA-Z.]{2,5}$"
> Also, if I am going to worry about (and allow) email addresses that
> have 2 dots after the @ sign, should I worry about there being email
> addresses with 3 or more dots? What expression would handle an
> infinite number of dots after the @ sign?
That one will do it just fine, and there are sometimes addresses with more
dots, ie [EMAIL PROTECTED], as in the case
of the byu computers.
____________________
BYU Unix Users Group
http://uug.byu.edu/
___________________________________________________________________
List Info: http://uug.byu.edu/cgi-bin/mailman/listinfo/uug-list
