Originally Posted by davy
yeah malt extract dry or liquid most any type of sugar that you would use to make beer will work.
I asked because you can also use malt to make a starter. But in this case you would have to make a simple mash.
But you should not take any kind of sugar. If you expect the yeast to ferment maltose, the starter should be maltose based. If it is not, the yeast may get lazy and loose its ability to metabolize maltose.