On Tue, Dec 06, 2022 at 07:28:20PM +0100, Jens Lechtenboerger wrote:
> Hi there,
> 
> the syntax for Text Markup such as *bold* at [1] specifies
> PRE MARKER CONTENTS MARKER POST with
> CONTENTS as BORDER BODY BORDER and
> BORDER as “Any non-whitespace character.”
> 
> What is the role of BORDER here?  Does it really exist?
> 
> What is BORDER if CONTENTS should be a single character, e.g., in
> the two strings “*x*” and “~*~”?  Are single characters forbidden?

Yes, this seems a bit unfortunate. The BORDER char may be identical
to the BODY. So *f* and *ff* are both valid markups.

Perhaps it'd be clearer to forget about the BORDER, only talk about
BODY and say that BODY is not empty and doesn't start or end with
a whitespace character.

Cheers

> [1] https://orgmode.org/worg/org-syntax.html#Emphasis_Markers

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t