nginx_connections are not grouped by aliasByNode

[nopium]

Hi,
I'm trying to import your Nginx Stats dashboard. I can see data points in graphite but in graphana aliasByNode(4) doesn't seem to work on metrics collected as nginx_connections-active, nginx_connections-reading, etc...

I suppose it expects dot(.) rather than minus(-).

https://gyazo.com/50feecac3feea1b3c298065e6dd98435

Could you please help me with function that would work in this case?

Thanks!