What did you expect it to return? Consider this

my $bar = 'asdf  asdf  asdf-rdf';
my $mor = () = $bar =~ /asdf(?:-rdf)?/;
my $gor = () = $bar =~ /asdf(?:-rdf)?/g;
my @gor = $bar =~ /asdf(?:-rdf)?/g;

warn scalar @gor;
die "$mor and $gor = @gor";
__END__
3 at - line 6.
1 and 3 = asdf asdf asdf-rdf at - line 7.
[download]

update:
It returns the number of times the entire pattern matched ( aka the number of total matches). .
My apologies. What's returned are the values of the capture buffers (parens create a capture buffer). my $mor = () = $bar =~ /asdf(?:-rdf)?/; could be rewritten as my $gor = my @gor = $bar =~ /asdf(?:-rdf)?/g;

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