Date: Tue, 26 Aug 2008 20:23:17 -0700 From: Bill Campbell <freebsd@celestial.com> To: freebsd-questions@freebsd.org Subject: Re: Regular Expression Trouble Message-ID: <20080827032317.GA29551@ayn.mi.celestial.com> In-Reply-To: <200808270312.m7R3CJNk076060@dc.cis.okstate.edu> References: <200808270312.m7R3CJNk076060@dc.cis.okstate.edu>
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On Tue, Aug 26, 2008, Martin McCormick wrote: >I am trying to isolate only the MAC addresses that appear in >dhcpd logs. >For anyone who is interested, the sed construct that should do >this looks like: > > sed 's/.*\([[ your regular expression ]]\).*/\1/' > >The \1 tells sed to only print what matched and skip all the rest. > I just tried this, and it worked: sed -n 's;.* to \([0-9:a-z]*\) via.*;\1;p' logfile It would have been easier in perl or python where one could use the pattern '.* to (\S+) via.*'. Bill -- INTERNET: bill@celestial.com Bill Campbell; Celestial Software LLC URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way Voice: (206) 236-1676 Mercer Island, WA 98040-0820 Fax: (206) 232-9186 My reading of history convinces me that most bad government results from too much government. --Thomas Jefferson.
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