CLHS: Function ALPHANUMERICP

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Function ALPHANUMERICP

Syntax:

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))))

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