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  ANSI Common Lisp   13 Characters   13.2 Dictionary of Characters

13.2.15 upper-case-p, lower-case-p, both-case-p Function

upper-case-p character generalized-boolean
lower-case-p character generalized-boolean
both-case-p character generalized-boolean

Arguments and Values:
character - a character.

generalized-boolean - a generalized boolean.

These functions test the case of a given character.

upper-case-p returns true if character is an uppercase character; otherwise, returns false.

lower-case-p returns true if character is a lowercase character; otherwise, returns false.

both-case-p returns true if character is a character with case; otherwise, returns false.

 (upper-case-p #\A)  true
 (upper-case-p #\a)  false
 (both-case-p #\a)  true
 (both-case-p #\5)  false
 (lower-case-p #\5)  false
 (upper-case-p #\5)  false
 ;; This next example presupposes an implementation 
 ;; in which #\Bell is an implementation-defined character.
 (lower-case-p #\Bell)  false

Exceptional Situations:
Should signal an error of type type-error if character is not a character.

See Also:
char-upcase, char-downcase, Section Characters With Case, Section 13.1.10 Documentation of Implementation-Defined Scripts

Allegro CL Implementation Details:

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