No space before and after $. math preview is not activated about org-fragtog

[io12]

#16 (comment)

[jinlin82]

Thanks, I come up with a function by regexp which adds space before and after $ for each inline latex fragment in selected region, then org-fragtog works. The function is:

(defun math-delimiter-add-space-inline(beg end)
  (interactive "*r")
  (let ((beg (if (region-active-p)
                 (region-beginning)
               (line-beginning-position)))
        (end (if (region-active-p)
                 (region-end)
               (line-end-position))))
    (save-restriction
      (narrow-to-region beg end)
      (save-excursion
	(goto-char (point-min)) 
	(while 
	    (search-forward-regexp " *\\$\\([^$].*?[^$]\\)\\$[^$] *" nil t)
	  (replace-match " $\\1$ " nil nil))))
    ))

So I close this issue.