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digit-char-p char &optional radix ⇒ weight
char—a character.
radix—a radix. The default is 10.
weight—either a non-negative integer less than radix, or false.
Tests whether char is a digit in the specified radix (i.e., with a weight less than radix). If it is a digit in that radix, its weight is returned as an integer; otherwise nil is returned.
(digit-char-p #\5) ⇒ 5
(digit-char-p #\5 2) ⇒ false
(digit-char-p #\A) ⇒ false
(digit-char-p #\a) ⇒ false
(digit-char-p #\A 11) ⇒ 10
(digit-char-p #\a 11) ⇒ 10
(mapcar #'(lambda (radix)
(map 'list #'(lambda (x) (digit-char-p x radix))
"059AaFGZ"))
'(2 8 10 16 36))
⇒ ((0 NIL NIL NIL NIL NIL NIL NIL)
(0 5 NIL NIL NIL NIL NIL NIL)
(0 5 9 NIL NIL NIL NIL NIL)
(0 5 9 10 10 15 NIL NIL)
(0 5 9 10 10 15 16 35))
None. (In particular, the results of this predicate are independent of any special syntax which might have been enabled in the current readtable.)
Digits are graphic characters.