Re: [PATCH] Fix regex for determining image width from attribute

[Max Nikulin <manikulin@gmail.com>]

On 25/11/2021 00:00, Max Nikulin wrote:
> On 24/11/2021 22:59, Matt Huszagh wrote:
> 
> I am sorry that I confused you by my note concerning space before 
> :width. I am afraid, current variant means repeated ":"
> 
>> +                      (concat "^[ \t]*#\\+attr_"
>> +                              backend
>> +                              ":+.*? :width +\\(\\S-+\\)")))
>                                   ^
> ----------------------------------'
> 
> Is space after "#+attr_XXX:" is required at all? Is something besides 
> spaces allowed here?

Of course, another attributes may be there.

> Untested:
> ":\\s-*:width\\s-+\\(\\S-+\\)"
> I am unsure concerning newlines as space characters, so the following, 
> perhaps, is more correct:
> ":[^\n\\S-]*:width[^\n\\S-]+\\(\\S-+\\)"
> 
> Actually value is everything till line end besides trailing spaces, so 
> precise regexp should be a bit longer.

I am confused. I can not figure out how to create the following as HTML 
export result:

<img src="img.png" alt="An image without :width 600 attribute">

Attempt to add quotes leads to &quot; and does not prevent ":width" to 
become another attribute.

   #+attr_html: :alt An image without :width 600 attribute
   [[file:img.png]]

   <p><img src="img.png" alt="An image without" width="600 attribute" />
</p>

My current variant:

":\\(?:[^\n]*?[[:blank:]]\\)?:width[[:blank:]]+\\(\\S-+\\)"

The regexp should not match e.g.

#+attr_html: :alt something
:width 600

P.S. I would prefer to use the same parser as ox does.