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  ANSI Common Lisp   13 Characters   13.2 Dictionary of Characters

13.2.9 alphanumericp Function

alphanumericp character    generalized-boolean

Arguments and Values:
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

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

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))))

Allegro CL Implementation Details:

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