You could use a while loop with //g ( perlre):
use warnings;
use strict;
use Data::Dumper;
my $log = 'BACKLOG-123, BACKLOG-124, BACKLOG-125';
my @tickets;
while ($log =~ /([A-Z]+-\d+)/g) {
push @tickets, $1;
}
print Dumper(\@tickets);
__END__
$VAR1 = [
'BACKLOG-123',
'BACKLOG-124',
'BACKLOG-125'
];
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