^(?0|[1-9][0-9]*)\.(?0|[1-9][0-9]*)\.(?0|[1-9][0-9]*)(?:-(?(?:0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+(?[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$\n