char package:formatting

char :: Format r (Char -> r)
formatting Formatting.Formatters
Output a character.
charsKeptIf :: (Char -> Bool) -> Format r a -> Format r a
formatting Formatting.Combinators
Filter the formatted string to contain only characters which pass the given predicate: 
>>> format (charsKeptIf Data.Char.isUpper text) "Data.Char.isUpper"
"DCU"
charsRemovedIf :: (Char -> Bool) -> Format r a -> Format r a
formatting Formatting.Combinators
Filter the formatted string to not contain characters which pass the given predicate: 
>>> format (charsRemovedIf Data.Char.isUpper text) "Data.Char.isUpper"
"ata.har.ispper"