Given how often TLDs are changing is there a way in CF to do a verification
that the domain name exists? That would seem simpler.
Ben
> On Jan 15, 2015, at 10:06 AM, Byron Mann <byronos...@gmail.com> wrote:
>
>
> With all the new top level domains available now (), you are better with a
> regex that matches by size, instead of adding specific strings beyond 3 or
> 4 characters.
>
> Just change the {2,4} to something like {2,254}, which should fairly
> "future" proof the regex.
>
> I believe the RFC for DNS has a maximum length of 253 for a domain, while
> the RFC for an email address is 254 for max length.
>
> http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains#ICANN-era_generic_top-level_domains
>
> http://en.wikipedia.org/wiki/Email_address
>
> Interesting to note, that many special characters are allowed in the local
> part and IPV4 and IPV6 addresses are allowed for the domain part of an
> email address. The first regex Robert provided will handle most typical
> email addresses however.
>
> I don't think I've seen an email with an IP domain in like forever, but if
> IPV6 every takes hold, it's very possible it would become typical at some
> point.
>
> ~Byron
>
>
>
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