[Mimedefang] RelayAddr

[Matthew.van.Eerde at hbinc.com]

To be pedantic, the only IP address that matches
/^127.0.0.1$/
is 
'127.0.0.1'

In fact, there is nothing special about the number of digits in each byte.
Since every IP address has exactly three periods, you can test against

/^(\d{1,3})(.)(\d{1,3})(.)(\d{1,3})(.)(\d{1,3})$/

and bet your life that
$2 eq "." and $4 eq "." and $6 eq "."

and further that
"$1.$3.$5.$7" is the original IP address.

That said, it is still a good idea to keep in the habit of escaping . inside
// - it's just better practice to test against

/^127\.0\.0\.1$/

than against

/^127.0.0.1$/

Also note that since you're testing against a literal in the first option
instead of a pattern, it should run much faster than the second option.

> -----Original Message-----
> From: Ashley M. Kirchner [mailto:ashley at pcraft.com]
> Sent: Friday, September 20, 2002 13:26
> To: mimedefang at lists.roaringpenguin.com
> Subject: Re: [Mimedefang] RelayAddr
> 
> 
> Nels Lindquist wrote:
> 
> > <INIGO>
> > I do not think this regular expression means what you think 
> it means.
> > </INIGO>
> >
> > Remember that "." (dot) is a special character in perl regexps.  I
> > think you mean 127\.0\.0\.1.
> 
>     I have this working on an older installation of MD just 
> fine.  It picks it
> up as is.  $LocalNetworks on the other hand does escape the 
> dots.  Don't ask me
> why, nor how, but it works.
> 
> --
> W | I haven't lost my mind; it's backed up on tape somewhere.
>   
> +--------------------------------------------------------------------
>   Ashley M. Kirchner <mailto:ashley at pcraft.com>   .   
> 303.442.6410 x130
>   IT Director / SysAdmin / WebSmith             .     
> 800.441.3873 x130
>   Photo Craft Laboratories, Inc.            .     3550 
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> 
> 
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