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Top Forums Shell Programming and Scripting Help to parse syslog with perl Post 303037318 by Chubler_XL on Monday 29th of July 2019 05:50:11 PM
Old 07-29-2019
Many modern sed implementations support extended regular expressions (POSIX ERE) via the -E option . This is not a powerful as perl and does not support named capture groups, but should be sufficient for your requirement.

Using ERE with the sed -n option (to suppress automatic printing of pattern space) we can do:

Code:
sed -En 's/.*dstcountry=("[^"]+"|\S+).*/\1/p'
sed -En 's/.*dstcountry="([^"]+)".*/\1/p'

\1 in the replace part of the substitution is referring to the first capture group the same as $1 in perl.

Sorry I don't know of a good source to learn all this stuff, I just picked it up over the years of using these products. Perhaps try searching for "learning regex" or "regular expression examples" using your favorite search engine.

I did a quick search myself and came across this quite nice regex cheat sheet, it seems to cover a lot of features and is fairly easy to use Regex Cheat Sheet
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Razor2::Syslog(3)					User Contributed Perl Documentation					 Razor2::Syslog(3)

NAME
Razor2::Syslog -- Syslog support for Razor2 SYNOPSIS
use Razor2::Syslog; my $s=new Razor2::Syslog(Facility=>'local4',Priority=>'debug'); $s->send('see this in syslog',Priority=>'info'); DESCRIPTION
This module has been derived from Net::Syslog. Some optimizations were made to Net::Syslog, in particular support for keeping a socket open. What follows is the documentation for Net::Syslog, which completely applies to this module. Net::Syslog implements the intra-host syslog forwarding protocol. It is not intended to replace the Sys::Syslog or Unix::Syslog modules, but instead to provide a method of using syslog when a local syslogd is unavailable or when you don't want to write syslog messages to the local syslog. The new call sets up default values, any of which can be overridden in the send call. Keys (listed with default values) are: Name <calling script name> Facility local5 Priority err SyslogPort 514 SyslogHost 127.0.0.1 Valid Facilities are: kern, user, mail, daemon, auth, syslog, lpr, news, uucp, cron, authpriv, ftp, local0, local1, local2, local3, local4, local5, local6 Valid Priorities are: emerg, alert, crit, err, warning, notice, info, debug AUTHOR
Les Howard, les@lesandchris.com Vipul Ved Prakash, mail@vipul.net SEE ALSO
syslog(3), Sys::Syslog(3), syslogd(8), Unix::Syslog(3), IO::Socket, perl(1) perl v5.12.1 2005-05-09 Razor2::Syslog(3)
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