{1}# Simple raw string{0} {4}r''{0} {1}# Raw f-string{0} {17}rf''{0} {17}fr''{0} {1}# Raw byte string{0} {4}rb''{0} {4}br''{0} {1}# Raw unicode strings: ur'' is valid in 2.7 (but not in 3) -- always lexed as{0} {1}# valid; ru'' is never valid{0} {11}ru{4}''{0} {4}ur''{0}