Predicate that checks if a Char
is a digit.
Predicate that checks if a Char
is a letter.
Predicate that checks if a Char
is a letter or digit.
Predicate that checks if a Char
is a lower case character.
Predicate that checks if a Char
is an upper case character.
Predicate that checks if a Char
is white space.
Module for
Char
related predicates.