Посчитать колличество символов в строке

(count #\t "The Hyperspec contains approximately 110,000 hyperlinks." :test #'equal)
; 2
(count #\t "The Hyperspec contains approximately 110,000 hyperlinks." :test #'equalp)
; 3
(count-if #'digit-char-p "The Hyperspec contains approximately 110,000 hyperlinks.")
; 6
(count-if #'digit-char-p "The Hyperspec contains approximately 110,000 hyperlinks." :start 38)
; 5