ALPHA-CHAR-P

recognizer for alphabetic characters
Major Section:  PROGRAMMING

(Alpha-char-p x) is true if and only if x is a alphabetic character, i.e., one of the characters #a, #b, ..., #z, #A, #B, ..., #Z.

The guard for alpha-char-p requires its argument to be a character.

Alpha-char-p is a Common Lisp function. See any Common Lisp documentation for more information.