Use object properties or object types to include objects in a selection set, or to exclude them.
With object selection filters, to filter your selection set based on color, linetype, or lineweight, consider whether these properties are set to BYLAYER for any objects in your drawing. For example, an object may appear red because its color is set to BYLAYER and the layer color is red.
By default, objects of the same type are considered similar if they are on the same layer, and, for blocks and other referenced objects, have the same name. Subobjects are only considered at the object level. For example, when a mesh vertex is selected, SELECTSIMILAR selects other mesh objects, not just the mesh vertices.