From mboxrd@z Thu Jan  1 00:00:00 1970
From: Carsten Dominik <carsten.dominik@gmail.com>
Subject: Re: [RFC] Alternative to sub/superscript regexp
Date: Tue, 26 Nov 2013 10:20:20 +0100
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To: Nicolas Goaziou <n.goaziou@gmail.com>
Cc: Org Mode List <emacs-orgmode@gnu.org>

Hi Nicolas,

I have tested this a bit, and it does pretty much what I want.
Just to be sure:  We will also support expressions with braces, right?

- Carsten

On Nov 25, 2013, at 6:14 PM, Nicolas Goaziou <n.goaziou@gmail.com> =
wrote:

> Hello,
>=20
> For the record `org-match-substring-regexp' is a variation on:
>=20
> "\\(\\S-\\)\\([_^]\\)\\(\\(?:\\*\\|[-+]?[^-+*!@#$%^_ =
\t\r\n,:\"?<>~;./{}=3D()]+\\)\\)\\)"
>=20
> I think it is a bit convoluted and therefore difficult to predict. For
> example, as recent bug report showed, you may tend to interpret
> a_b[fn:1] as
>=20
>   a_{b}[fn:1]
>=20
> but, in fact, it is equivalent to
>=20
>   a_{b[fn}:1]
>=20
> Of course, we can prevent this by forbidding "[" and "]" in the last
> part of the regexp. But I wonder if there's something better to do.
>=20
> The idea behind this regexp is that we should be able to write simple
> sub/superscript, including numbers and entities, without requiring =
curly
> braces (see `org-use-sub-superscripts' docstring for details). Maybe
> something like the following could be an interesting alternative:
>=20
>  =
"\\(\\S-\\)\\([_^]\\)\\(\\*\\|[+-]?\\(?:\\w\\|[0-9.,\\]\\)*\\(\\w\\|[0-9]\=
\)\\)"
>=20
> That is, without braces, either an asterisk or any combination of =
word,
> number, dot, comma and backslash characters, which may start with =
either
> a plus or a minus sign but cannot end with either a dot or a comma.
>=20
> I find it arguably more predictable (no inverted class). Also, we =
"gain"
> the following:
>=20
>  a^3.14. <=3D> a^{3.14}.
>=20
> At the moment, a^3.14. <=3D> a^{3}.14.
>=20
> What do you think?
>=20
>=20
> Regards,
>=20
> --=20
> Nicolas Goaziou
>=20