my %HoL = 

( 'cluster1' => [ 'remap.config', 'remap.config.hosts',
                  'origin.db', 'origin.db.hosts', 
                  'local_cluster.db', 'local_cluster.hosts' ]
);

my $cluster = 'cluster1';
my @array   = @{$HoL{$cluster}};
my $find    = 'remap.config.hosts';
my @matches = grep { /\Q$find\E/ }@array;

print "Found @matches" if @matches;