If you want to stick with a recursive solution:
use Test::More tests => 1;
my @data = qw( 000- 0101 011- 1-0- );
my @expected = qw( 0000 0001 0101 0110 0111 1000 1001 1100 1101 );
my @got = map { expand_binary( $_ ) } @data;
is_deeply \@got, \@expected;
sub expand_binary {
my $bin = shift;
if ( $bin =~ /-/ ) {
( my $zero = $bin ) =~ s/-/0/;
( my $one = $bin ) =~ s/-/1/;
return ( expand_binary( $zero ), expand_binary( $one ) );
}
return $bin;
}
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