alphanumericp

alphanumericp Function

Syntax:

alphanumericp character → generalized-boolean

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))))

Expanded Reference: alphanumericp

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(alphanumericp )