org-replace-region-by-html Source

Exerpted from org-html.el.

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<pre>
(defun org-replace-region-by-html (beg end)
  "Assume the current region has org-mode syntax, and convert it to HTML.
This can be used in any buffer.  For example, you could write an
itemized list in org-mode syntax in an HTML buffer and then use this
command to convert it."
  (interactive "r")
  (let (reg html buf pop-up-frames)
    (save-window-excursion
      (if (derived-mode-p 'org-mode)
	  (setq html (org-export-region-as-html
		      beg end t 'string))
	(setq reg (buffer-substring beg end)
	      buf (get-buffer-create "*Org tmp*"))
	(with-current-buffer buf
	  (erase-buffer)
	  (insert reg)
	  (org-mode)
	  (setq html (org-export-region-as-html
		      (point-min) (point-max) t 'string)))
	(kill-buffer buf)))
    (delete-region beg end)
    (insert html)))
</pre>