Date: Tue, 15 Jul 2003 06:01:52 -0400 (EDT) From: Steve Coile <scoile@nandomedia.com> To: D J Hawkey Jr <hawkeyd@visi.com> Cc: questions at FreeBSD <freebsd-questions@freebsd.org> Subject: Re: Attn: sed(1) regular expression gurus Message-ID: <Pine.LNX.4.44.0307150542570.26376-100000@localhost.localdomain> In-Reply-To: <20030714140816.GA27439@sheol.localdomain>
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On Mon, 14 Jul 2003, D J Hawkey Jr wrote:
>I'm getting really frustrated by a seemingly simple problem. I'm doing
>this under FreeBSD 4.5.
>
>Given these portions of an e-mail's multi-line Received header as tests:
>
> by some.host.at.a.com (Postfix) with ESMTP id 3A4E07B03
> by some.host.at.a.com (8.11.6) ESMTP;
> by some.host.at.a.different.com (8.11.6p2/8.11.6) ESMTP;
> by some.host.at.another.com ([123.4.56.789]) id 3A4E07B03
> by some.host.at.yet.another.com (123.4.56.789) id 3A4E07B03
# tested with sed-4.0.5-1 for RHL 9.0
# remove junk we don't care about
s/^.*by \([^ ]*\) (\([^)]*\)).*$/\1 \2/
# identify valid hostname
s/^[[:alnum:]][-[:alnum:]]*\(\.[[:alnum:]][-[:alnum:]]*\)*/host:&/
# identify valid IP address (w/o brackets)
s/[[:digit:]]\{1,3\}\(\.[[:digit:]]\{1,3\}*\)\{3\}$/ipaddr:&/
# identify valid IP address (w/brackets)
s/\[\([[:digit:]]\{1,3\}\(\.[[:digit:]]\{1,3\}*\)\{3\}\)\]$/ipaddr:\1/
# discard if no valid hostname or IP address
/\(^host:\| ipaddr:\)/!d
# if valid IP address, discard anything else
s/^.* ipaddr://
# if valid hostname, discard anything else
s/^host:\([^ ]*\).*$/\1/
--
Steve Coile
Systems Administrator
Nando Media
ph: 919-861-1200
fax: 919-861-1300
e-mail: sysadmins@nandomedia.com
http://www.nandomedia.com
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