Date: Tue, 15 Jul 2003 12:33:38 +0930 From: "Rob" <listone@deathbeforedecaf.net> To: <hawkeyd@visi.com> Cc: questions at FreeBSD <freebsd-questions@freebsd.org> Subject: Re: sed(1) regular expression gurus Message-ID: <00ef01c34a7f$e5afedc0$a4b826cb@goo> References: <20030714140816.GA27439@sheol.localdomain><00b001c34a1b$4ad17800$a4b826cb@goo> <20030714160454.GA28042@sheol.localdomain>
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Probably because I'm using FS to throw away all non-hostname
characters - by the time it gets to the sendmail version, there's
nothing to distinguish one group of 4 numbers from another.
The 'one or more' is for lines like this
by some.host.at.another.com ([123.4.56.789]) id 3A4E07B03
^ ^^^ ^^^ ^
where the hostnames (or IPs) are separated by multiple characters. As
you've discovered, this isn't necessarily the best approach....
----- Original Message -----
From: "D J Hawkey Jr" <hawkeyd@visi.com>
Subject: Re: sed(1) regular expression gurus
> On Jul 15, at 12:49 AM, Rob wrote:
> >
> > awk --posix -F'[^0-9A-Za-z.]+' '
> > $1 ~ /by/ { result = $2
> > for (i=3; i<=NF; i++) {
> > if ($i ~ /^([0-9]+\.){3}[0-9]+$/) {
> > result = result " " $i
> > }
> > }
> > print result
> > }'
> >
> > There may be 'neater' ways of doing it, but it's the most concise
> > example I could come up with.
>
> This is better than anything I've dreamed up with sed or awk, and is
> really close, but it fails on this:
>
> by nospam.mc.mpls.visi.com (8.11.6/8.11.6.2) with ESMTP id 3A4E07B03
>
> The parenthetical is a [hacked] sendmail version. I don't see how the
> script fails, though, as you do test for a full/complete "dotted
quad",
> and even test for a BOL and EOL on either side it. The "8.11.6"
shouldn't
> match. I changed the '+'es to "{1,3}"s for even better precision in
the
> "if (...)", but it didn't make any difference (nor should it have).
>
> BTW, why the "one or more" flag in the FS assignment?
>
> > You need to include the --posix option to get the '{3}' notation to
work
> > (peculiar to GNU awk).
>
> Kinda throws portability out the window, but I'll settle for it.
>
> Dave
>
> --
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