[register] Request to change the NAPTR record for ftp.uri.arpa

[Frank Ellermann]

2011/7/10 Mykyta Yevstifeyev:

>> That can be simplified to:
>>   !^ftp://([^@]*@)?([^:/?#]*).*$!\\2!i

> I agree with you here.  Yet, actually this may be simplified
> far to

>>   !^ftp://(.*@)?([^:/?#]*).*$!\\2!i

Is "anything ending with '@'" (in your version) the same as
"any non-'@' ending with the first '@'" (in JimC's version)?
For clarity I'd prefer the first version, but maybe we are
not yet ready:

> "@" chars are not generally allowed in in <userinfo> without
> percent encoding, as well as in other parts of the URI.

As soon as you are behind the <userinfo> in an <authority>
it is not more necessary to percent-encode '@'.  I'm too lazy
to check it, but I guess that '@' is an ordinary <pchar>, and
also allowed in query parts and fragments.

After all mailto: and news: URLs use '@' for their purposes
outside of <userinfo>.

Therefore we might need something in the direction of...
!^ftp://([^@/?#]*@)?([^:/?#]*).*$!\\2!i
...matching '@' only before any path or query or fragment.
[^@/?#]* should match the colon in a user:pass <userinfo>.

-Frank