Catalyzes the hydrolysis of glucose from the disaccharide unit linked to hydroxylysine residues of collagen and collagen-like proteins. (5R)-5-O-[alpha-D-glucosyl-(1->2)-beta-D-galactosyl]-5-hydroxy-L-lysyl-[collagen] + H2O = (5R)-5-O-(beta-D-galactosyl)-5-hydroxy-L-lysyl-[collagen] + D-glucose Belongs to the glycosyl hydrolase 65 family.