kill-region

The zap-to-char function uses the kill-region function. This function is very simple; leaving out part of its documentation string, it looks like this:

(defun kill-region (beg end)
  "Kill between point and mark.
The text is deleted but saved in the kill ring."
  (interactive "*r")
  (copy-region-as-kill beg end)
  (delete-region beg end))

The main point to note is that it uses the delete-region and copy-region-as-kill functions which are described in following sections.

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