#format is:-
#
#   #time_start:time_end:day_start:day_end:drive:path:filename:error

 0000:2300:1:5:C:Temp:test.server.net.log:No messages have been receiv
+ed from the remote host for the specified time period.
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Barebones approach that you can extrapolate into what you're looking for:

#!/usr/bin/perl -w
use strict;

open my $config, "config.cfg" or die "config.cfg: $!\n";
# Assuming the config file structure is one error per line
my %errlist = map { chomp; $_ => 1 } <$config>;
close $config;

open my $log, "logfile.txt" or die "logfile.txt: $!\n";
while (<$log>){
    chomp;
    /:([^:]+)$/;
    print "Error '$1' found on line $.\n" if exists $errlist{$1};
}
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In other words, you use the hash to store all your "valid errors", then check the actual errors against that hash. Fairly common algorithm, certainly in Perl.


--
"Language shapes the way we think, and determines what we can think about."
-- B. L. Whorf