UPDATE: I'd really just be interested in skipping line if it is not UTF-8, or not dealing with these lines at all.
Do you realize that you'd be skipping all four lines you posted since none are valid UTF-8?
It's easy to do:
use strict;
use warnings;
use open ':std', ':locale';
use Encode qw( );
my $log = 'log';
open(my $fh, '<:raw:perlio', $log)
or die("Can't open log file \"$log\": $!\n");
while (<$fh>) {
s/\r?\n\z//;
my $data = (split(/ /, $_, 4))[3];
my ($text) = eval { decode("UTF-8", $data, Encode::FB_CROAK) }
or next;
print($text);
}
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