Re: Subscript with parenthesis

[Ihor Radchenko]

"Tom Alexander" <tom@fizz.buzz> writes:

> Some additional things I'm noticing:
>
> - when using parenthesis, :use-brackets-p is nil, so they're not equivalent 
> to curly braces.

`org-element-subscript-parser' uses `org-match-substring-regexp', which
indeed allows foo_(...). This is not documented in org-syntax.org and in
the manual (12.3 Subscripts and Superscripts).

> - it does not support objects inside the parenthesis, just plain text, which 
> again means they're not equivalent to braces.

Not true. I tried

b^(*asd*) and bold inside superscript does get parsed.

> - it, however, seems to require that the parenthesis are balanced because 
> this test document does NOT contain a subscript:
> ```
> foo_(b(ar)
> ```
> which is closer to the curly braces requirement since that seems to be the 
> only part of the subscript/superscript documentation that mentions needing 
> balance.

Yup - the regexp used is the same with what we do for curly braces:

(defconst org-match-substring-regexp
  (concat
   "\\(\\S-\\)\\([_^]\\)\\("
   "\\(?:" (org-create-multibrace-regexp "{" "}" org-match-sexp-depth) "\\)"
   "\\|"
   "\\(?:" (org-create-multibrace-regexp "(" ")" org-match-sexp-depth) "\\)"
   "\\|"
   "\\(?:\\*\\|[+-]?[[:alnum:].,\\]*[[:alnum:]]\\)\\)")
  "The regular expression matching a sub- or superscript.")

-- 
Ihor Radchenko // yantar92,
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