13.2.9 alphanumericp [Function]

alphanumericp character ⇒ generalized-boolean

Arguments and Values::

character—a character.

generalized-boolean—a generalized boolean.

Description::

Returns true if character is an alphabetic_1 character or a numeric character; otherwise, returns false.

Examples::

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

Affected By::

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

Exceptional Situations::

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

See Also::

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

Notes::

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))))