alphanumericp (ANSI and GNU Common Lisp Document)

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#### 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))))