From: "Micheal Espinola Jr" <[EMAIL PROTECTED]>
> Eric B. wrote:
> > I don't understand a couple of things here with that last pattern.
> > For starters, why do you have the [a-z\d] at the end of the expression?
> > Doesn't the (?!-\b) already ensure that the string will finish with
[a-z\d]
> > ? If so, why specify it again?
> > Secondly, doesn't this expression also allow the the sequence to begin
with
> > a hyphen? I would have expected this sequence to have to start with an
> > [a-z\d].
> >
>
> This regular Expression is very strict, and is based on RFC
> specifications. The end of a hostname segment must end with an
> alphabetic character or number. \b does not apply such a restriction.
I've never seen the last segment requirement to be an alphabetic character-
only the first. RFC-1123 says-
2.1 Host Names and Numbers
The syntax of a legal Internet host name was specified in RFC-952
[DNS:4]. One aspect of host name syntax is hereby changed: the
restriction on the first character is relaxed to allow either a
letter or a digit. Host software MUST support this more liberal
syntax.
Bro
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