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Date: Sat, 10 Dec 2005 01:42:15 +0300
From: "Andrew P." <infofarmer@gmail.com>
To: Martin McCormick <martin@dc.cis.okstate.edu>
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References: <200512092212.jB9MCQhn092277@dc.cis.okstate.edu>
Cc: freebsd-questions@freebsd.org
Subject: Re: Regular Expression Trouble
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On 12/10/05, Martin McCormick <martin@dc.cis.okstate.edu> wrote:
>         After reading  a bit about extended regular expressions and
> having a few actually work correctly in sed scripts, I tried one in
> egrep and it isn't working although there are no errors.
>
>         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.  It is obviously not filtering correctly.
> Plain grep produces a 0-length output file so that is not too useful
> either.  Putting double quotes around the RE didn't help either.
>
>         It seems to match almost everything.
>
>         Thanks for any good ideas.
>
> Martin McCormick WB5AGZ  Stillwater, OK
> OSU Information Technology Department Network Operations Group
> .-- -... ..... .- --. --..
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Isn't it a character class consisting of a white-space
and three letters?