Hi Arash,

> What do get with your patch when you eval this form:
>
> --8<---------------cut here---------------start------------->8---
> (mapcar
>  (lambda (str)
>    (with-temp-buffer
>      (LaTeX-mode)
>      (insert str)
>      (char-to-string (char-before (TeX-find-macro-end-helper (point-min))))))
>  '("\begin{enumerate}[a]"
>    "\begin{enumerate}[(a)]"
>    "\begin{enumerate}[a)]"
>    "\begin{enumerate}[a{]}]"))
> --8<---------------cut here---------------end--------------->8---

I get the right answer ("]" "]" "]" "]"), but for the wrong reason:
evaluating

--8<---------------cut here---------------start------------->8---
(mapcar
 (lambda (str)
   (with-temp-buffer
     (LaTeX-mode)
     (insert str)
     (char-to-string (char-before (1- (TeX-find-macro-end-helper 
(point-min)))))))
 '("\begin{enumerate}[a{]}]"))
--8<---------------cut here---------------end--------------->8---

yields ("{"), which shows that it's picking up the wrong "]".

I guess this case could be covered by adding "{" and "}" to the syntax
table.  Can you imagine any further issues with that approach?

Thanks, best,

Paul



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