recognizer for upper case characters
Major Section:  PROGRAMMING

(Upper-case-p x) is true if and only if x is an upper case character, i.e., a member of the list #A, #B, ..., #Z.

The guard for upper-case-p requires its argument to be a standard character (see standard-char-p).

Upper-case-p is a Common Lisp function. See any Common Lisp documentation for more information.