my @conf_enum_values = @{ Moose::Util::TypeConstraints::find_type_constraint('conf')->values };

##</code><code>##

use Types::Standard -types;

my $Conf    = Enum[qw/ access input /];
my $Version = Enum[1 .. 2];

my $FileName = StrMatch[qr/^(\w+)\.(\d+)\.txt$/, Tuple[$Conf, $Version]];

has filename => (is => 'rw', isa => $FileName);