{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}

