(dig2 (char-after (match-beginning 3))))
(delete-region (match-end 1) (match-end 0))
(goto-char (match-beginning 1))
- (delete-backward-char 1)
+ (delete-char -1)
(delete-char 5)
(insert (format "%c .. %c" (min dig1 dig2) (max dig1 dig2)))))
(goto-char (point-min)))))