HTML Export: Allow Greek letters in subscripts

Hsiu-Khuern Tang writes:

>  If I export the file
>
>  --------------------------------------------------
>  #+OPTIONS: ^:{}
>
>  * test
>
>   a_{\alpha}
>
>   a_{foo}
>  --------------------------------------------------
>
>  as HTML, I get "a_{&alpha;}" but "a<sub>foo</sub>": \alpha is not
>  subscripted but foo is.  I was expecting both to be subscripted,
>  since they are in {}.

This is a bug, fixed now.

lisp/ChangeLog

@@ -1,3 +1,8 @@
+2009-03-11  Carsten Dominik  <carsten.dominik@gmail.com>
+
+	* org-exp.el (org-create-multibrace-regexp): Do not add
+	backslashes to the class.
+
 2009-03-10  Carsten Dominik  <carsten.dominik@gmail.com>
 
 	* org-colview.el (org-columns-map): Better functions for moving up

lisp/org-exp.el

@@ -4689,7 +4689,7 @@ The regexp returned will match the entire expression including the
 delimiters.  It will also define a single group which contains the
 match except for the outermost delimiters.  The maximum depth of
 stacked delimiters is N.  Escaping delimiters is not possible."
-  (let* ((nothing (concat "[^" "\\" left "\\" right "]*?"))
+  (let* ((nothing (concat "[^" left right "]*?"))
 	 (or "\\|")
 	 (re nothing)
 	 (next (concat "\\(?:" nothing left nothing right "\\)+" nothing)))