use Test::More; use YAML::XS (); my $libyaml_version = YAML::XS::LibYAML::libyaml_version(); diag "libyaml version = $libyaml_version"; cmp_ok($libyaml_version, '=~', qr{^\d+\.\d+(?:\.\d+)$}, "libyaml_version ($libyaml_version)"); done_testing;