How to select vertices contained in object How can vertices be selected if they are contained in another?
Is there a way to do this using manual editing, Animation Nodes, or Sverchok?
Example:

How can the vertices contained within the cylinder be selected?
This is a similar question - Selecting all objects inside a mesh , in this case the question applies to vertices.
In this case, you can:
Select the cylinder, shift select the grid then enter edit mode.
Go to wireframe view and uncheck X Ray. Then from the top view, box select.