Remember to cover the basics, that is, what you expected to happen and what in fact did happen. You don't know how to make a good report? See
http://orgmode.org/manual/Feedback.html#Feedback Your bug report will be posted to the Org mailing list. ------------------------------------------------------------------------ The page http://orgmode.org/manual/Advanced-configuration.html has the following example: Here is an example filter that replaces non-breaking spaces ~ in the Org buffer with _ for the LaTeX back-end. (defun my-latex-filter-nobreaks (text backend info) "Ensure \"_\" are properly handled in LaTeX export." (when (org-export-derived-backend-p backend 'latex) (replace-regexp-in-string "_" "~" text))) (add-to-list 'org-export-filter-plain-text-functions 'my-latex-filter-nobreaks) This is confusing in several ways. First, the replacement is made the other way around (that is, _ is replaced by ~). Secondly, “_” does not denote a non-breaking space in org-mode, as far as I can see. Does the text mean “LaTeX non-breaking spaces”? Finally, underscore has a particular meaning in Org, namely, subscript. Is this an example that used to make sense but doesn’t any longer? Emacs : GNU Emacs 25.2.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9) of 2017-09-12 Package: Org mode version 9.0.10 (9.0.10-5-g1654a5-elpa @ /home/rrt/.emacs.d/elpa/org-20170904/) -- https://rrt.sc3d.org/