Decimal digit POSIX class.
Reorder.
ASCII POSIX class.
Control character POSIX class.
Reorder.
Lowercase letter POSIX class.
Punctuation POSIX class.
Uppercase letter POSIX class.
Hex digit POSIX class.
Stub in grapheme, printable, & word POSIX classes.
Merge pull request #103 from robrix/POSIX

POSIX