Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!convex!news
From: tchrist@convex.COM (Tom Christiansen)
Newsgroups: comp.unix.questions
Subject: Re: Pattern matching with awk
Message-ID: <1991Mar06.075023.4472@convex.com>
Date: 6 Mar 91 07:50:23 GMT
References: <9103040310.AA16551@cs.wmich.edu> <1991Mar04.051048.5864@convex.com> <345@tslwat.UUCP>
Sender: news@convex.com (news access account)
Reply-To: tchrist@convex.COM (Tom Christiansen)
Organization: CONVEX Software Development, Richardson, TX
Lines: 30
Nntp-Posting-Host: pixel.convex.com

From the keyboard of louk@tslwat.UUCP (Lou Kates):
:The following   awk  program looks   for expressions of the  form
:word@word where word contains only letters, numbers  and dots and
:the field separator is anything except letters, numbers, dots and
:@. You  can  change the regular  expressions in order to vary the
:effect:
:
:BEGIN { FS = "[^.a-zA-Z0-9@]+"; 
:	word = "[.a-zA-Z0-9]+";  
:	addr = "^" word "@" word "$" 
:      }
:{ for(i=1; i<=NF; i++) if ($i ~ addr) print $i }

$ awk -f foo.awk < file
awk: syntax error near line 5
awk: illegal statement near line 5

You meant a nawk program, not an awk program.  

You definitely need to have more characters in there -- consider
folks with dashes in their hostnames.  That's why my regexp was
more complicated.


--tom
--
	I get so tired of utilities with arbitrary, undocumented,
	compiled-in limits.  Don't you?

Tom Christiansen		tchrist@convex.com	convex!tchrist