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Date: Sat, 10 Dec 2005 01:24:01 -0500
From: Parv <parv@pair.com>
To: Glenn Dawson <glenn@antimatter.net>
Message-ID: <20051210062401.GA9151@holestein.holy.cow>
Mail-Followup-To: Glenn Dawson <glenn@antimatter.net>,
	Martin McCormick <martin@dc.cis.okstate.edu>,
	freebsd-questions@freebsd.org
References: <200512092212.jB9MCQhn092277@dc.cis.okstate.edu>
	<6.2.3.4.2.20051209145132.025e64c0@cobalt.antimatter.net>
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In-Reply-To: <6.2.3.4.2.20051209145132.025e64c0@cobalt.antimatter.net>
Cc: Martin McCormick <martin@dc.cis.okstate.edu>, freebsd-questions@freebsd.org
Subject: Re: Regular Expression Trouble
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in message <6.2.3.4.2.20051209145132.025e64c0@cobalt.antimatter.net>,
wrote Glenn Dawson thusly...
>
> At 02:12 PM 12/9/2005, Martin McCormick wrote:
> >
> >        I was hoping to get only the A records from a dns zone file so
> >the expression I used is:
> >
> >egrep [[:space:]IN[:space:]A[:space:]] zone_file >h0
> >
> >        Had it worked, all that would have appeared in the h0 file was
> >all the A or Address records.  Instead, I get those plus almost
> >everything else in the file.
> try:
> 
> egrep "IN[^[:alnum:]]+A" zone_file

For even finer results, use word boundaries ...

  egrep '\bIN[^[:alnum:]]+A\b' file
  egrep '\<IN[[:space:]]+A\>'  file


  - Parv

--