isAscii package:rio

isAscii :: Char -> Bool
rio RIO.Char
Selects the first 128 characters of the Unicode character set, corresponding to the ASCII character set.
isAsciiLower :: Char -> Bool
rio RIO.Char
Selects ASCII lower-case letters, i.e. characters satisfying both isAscii and isLower.
isAsciiUpper :: Char -> Bool
rio RIO.Char
Selects ASCII upper-case letters, i.e. characters satisfying both isAscii and isUpper.