The result of matchRegion: the rows a region picked, and how.
matchRegion
How the rows were picked.
With by: "name": the rows whose name only contains the text, left out because a name matched exactly (Sachsen leaves out Niedersachsen and Sachsen-Anhalt). Empty otherwise.
by: "name"
Sachsen
The matching rows (what filterByRegion returns).
filterByRegion
The result of
matchRegion: the rows a region picked, and how.