Regular Expression Trouble

[Glenn Dawson]

At 02:12 PM 12/9/2005, Martin McCormick 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.

try:

egrep "IN[^[:alnum:]]+A" zone_file

-Glenn


>Martin McCormick WB5AGZ  Stillwater, OK
>OSU Information Technology Department Network Operations Group
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