Thanks. Using your script, what I can't do is to include a heading inside 
the fenced div, can't I? The reason is that I need solution to be presented 
in a different slide. I had just found a kind of solution, using heading 
identifiers (although when compiling to beamer it spits a warning (as 
several sections share the same identifier):

local looking_at_section = false
local lvl = 0
local remove = {}  -- delete line if 'remove' array not needed

function Block (elem)
  if elem.t == "Header" then
    -- if elem.classes:includes('remove',1) then

    if elem.identifier == 'answer' then
      looking_at_section = true
      lvl = elem.
level
    else

      looking_at_section = looking_at_section and elem.level >
lvl
    end
  end
  if looking_at_section then
    remove[#remove + 1] = elem  -- delete line if 'remove' array not needed
    return {}
  end
end





El sábado, 6 de abril de 2019, 20:17:02 (UTC+2), BP escribió:
>
> I use a div with a class and a filter which removes divs with that class 
> like this:
>
> ````markdown
> :::answer
> **Answer:** 42.
> :::
> ````
>
> ````lua
> function Div (elem)
>   if elem.classes:includes('answer') then
>     return {} -- delete it
>   else
>     return elem
>   end
> end
> ````
>
> HTH,
>
> /bpj
>
> Den lör 6 apr. 2019 18:44pbeltran <pab...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org <javascript:>> skrev:
>
>> My purpose is to generate two versions from the same markdown file. Think 
>> in a worksheet or a set of reveal slides with and without solutions.
>>
>> If I use gpp, like suggested here,  
>> <https://randomdeterminism.wordpress.com/2012/06/01/how-i-stopped-worring-and-started-using-markdown-like-tex/>the 
>> math expressions in my .md (mathjax) get messed, since \ are escaped.
>>
>> Is there a way out of the box? For instance, by using custom fenced_divs 
>> and them telling pandoc to remove that specific div? I've taken a look at 
>> custom filters but I don't know haskell...
>>
>> Thanks
>>
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