I attached two filters. If you run:

pandoc -t latex -L highlight-red.lua -L in-red.lua <<< 'Some *==text in red==*!'

You get:

Some \colorbox{lightred}{{text in red}}!

Le Sunday 26 March 2023 à 02:42:54AM, Pa Sc a écrit :
> Do you mean the two filters that are in the original post? Or what filter do
> you mean?
> 
> Bastien DUMONT schrieb am Sonntag, 26. März 2023 um 00:08:53 UTC+1:
> 
>     Please share the two lua filters you use to parse `==` as a syntax for
>     highlighting and to print in red an emphasized span produced by this
>     filter. We can't figure out what is wrong without them.
> 
>     Le Saturday 25 March 2023 à 03:44:24PM, Pa Sc a écrit :
>     > Yeah, I have a MWE here: [1]https://tex.stackexchange.com/questions/
>     680766/
>     > help-with-lua-filter-for-markdown-to-latex-with-pandoc
>     >
>     > As for the command:
>     > ```
>     > mkdir -p /home/ME/Documents/Obsidian/Output/{{title}}
>     > pandoc -r markdown-auto_identifiers -w latex {{file_path:absolute}} -o /
>     home/ME
>     > /Documents/Obsidian/Output/{{title}}/{{title}}.tex --template="/home/ME/
>     > Documents/LaTeX/My Templates/Proposal/default-proposal.tex" --lua-filter=
>     /home/
>     > ME/Documents/LaTeX/Filters/highlight.lua --lua-filter=/home/ME/Documents/
>     LaTeX/
>     > Filters/highlight-period.lua --lua-filter=/home/ME/Documents/LaTeX/
>     Filters/
>     > Span.lua --lua-filter=/home/ME/Documents/LaTeX/Filters/highlight-red.lua
>     > --lua-filter=/home/ME/Documents/LaTeX/Filters/Span-red.lua
>     > ```
>     >
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