Returning values from redis using a partial key in one call

Hi question on partial keys. I have created a string which is a 2 part key, systemId_clientid, which maps to a value
But what I would like to do is return all the values for a partial key of just systemId.
At the moment I can run this query in two calls I use scan of the partial key with parm systemId_*, this returns a list
of systemId_clientid, I can then make another call mget which will take all the array of keys.
This works but its two calls. is there a way to do it in one call to redis