Data.Char.Alpha

Upper-case

data AlphaUpper

class HasAlphaUpper c

class AsAlphaUpper a

parseAlphaUpper

Lower-case

data AlphaLower

class HasAlphaLower c

class AsAlphaLower a

parseAlphaLower

Any case

data Alpha

class HasAlpha c

class AsAlpha r

parseAlpha

Accessory

upperlower

lowerupper