POSIX-style character class that matches letters or digits.
POSIX-style character class that matches an alphabetical letter.
POSIX-style character class that matches a space or tab.
POSIX-style character class that matches a control character.
POSIX-style character class that matches a decimal digit.
POSIX-style character class that matches a graphical character.
POSIX-style character class that matches a hexadecimal digit.
POSIX-style character class that matches a lowercase letter.
POSIX-style character class that matches any printable character.
POSIX-style character class that matches a punctuation character.
POSIX-style character class that matches any whitespace character.
POSIX-style character class that matches an uppercase letter.
Module containing POSIX-style predefined character classes.