nfd-worker shocks on motherboard name

[qdii]

Found that in the logs:

[nfd-worker.go:607] "ignoring label with invalid value" labelKey="nvidia.com/gpu.machine" labelValue="X9SRA/X9SRA-3" errors=["a valid label must be an empty string or consist of alphanumeric characters, '-', '' or '.', and must start and end with an alphanumeric character (e.g. 'MyValue', or 'my_value', or '12345', regex used for validation is '(([A-Za-z0-9][-A-Za-z0-9.]*)?[A-Za-z0-9])?')"]

Could you expand the regex?