alphanumericp (Function)

Syntax:

Arguments and Values:

character—a character.

generalized-boolean—a generalized boolean.

Description:

Returns true if character is an alphabetic₁ 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))))