hexdigit[variable] lower-case
[variable] upper-case
[variable] alphabetic
[variable] numeric
[variable] alphanumeric
[variable] punctuation
[variable] graphic
[variable] printing
[variable] control
[variable] blank
[variable] whitespace
[variable] hexdigit
Scheme48: predefined character sets.
SRFI-14 defines char-set:lower-case,
char-set:upper-case, char-set:letter,
char-set:digit, char-set:letter+digit,
char-set:punctuation, char-set:graphic,
char-set:printing, char-set:iso-control,
char-set:blank, char-set:whitespace and
char-set:hex-digit.
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