alphanumericp character → generalized-boolean

character — a character.

generalized-boolean — a generalized boolean.

Returns true if character is an alphabetic₁ character or a numeric character; otherwise, returns false.

(alphanumericp #\Z) → true 
(alphanumericp #\9) → true 
(alphanumericp #\Newline) → false 
(alphanumericp #\#) → false

None. (In particular, the results of this predicate are independent of any special syntax which might have been enabled in the current readtable.)

Should signal an error of type type-error if character is not a character.

alpha-char-p, graphic-char-p, digit-char-p

Alphanumeric characters are graphic as defined by graphic-char-p. The alphanumeric characters are a subset of the graphic characters. The standard characters A through Z, a through z, and 0 through 9 are alphanumeric characters.

(alphanumericp x) 
  ≡ (or (alpha-char-p x) (not (null (digit-char-p x))))