In markdown (written in Obsidian.md) I use a plugin/theme so that `*==text==*` is rendered as red instead of italic and highlighted.

I use this lua-filter to convert regular `==highlighting==` to LaTeX `\hl{highlighting}` which works perfectly: (I somehow require these two files, I can't remember why)

**highlight.lua**:

```
--[[
Add support for a custom inline syntax.
This pandoc Lua filter allows to add a custom markup syntax
extension. It is designed to be adjustable; it should not be
necessary to modify the code below the separator line.
The example here allows to add highlighted text by enclosing the
text with `==` on each side. Pandoc supports this for HTML output
out of the box. Other outputs will need additional filters.
Copyright: © 2022 Albert Krewinkel
License: MIT
]]

-- Lua pattern matching the opening markup string.
local opening = [[==]]

-- Lua pattern matching the closing markup string.
local closing = [[==]]

-- Toggle whether the opening markup may be followed by whitespace.
local nospace = true

-- Function converting the enclosed inlines to their internal pandoc
-- representation.
local function markup_inlines (inlines)
return pandoc.Span(inlines, {class="mark"})
end

------------------------------------------------------------------------

local function is_space (inline)
return inline and
(inline.t == 'Space' or
inline.t == 'LineBreak' or
inline.t == 'SoftBreak')
end

function Inlines (inlines)
local result = pandoc.Inlines{}
local markup = nil
local start = nil
for i, inline in ipairs(inlines) do
if inline.tag == 'Str' then
if not markup then
local first = inline.text:match('^' .. opening .. '(.*)')
if first then
start = inline -- keep element around in case the
-- markup is not closed. Check if the
-- closing pattern is already in this
-- string.
local selfclosing = first:match('(.*)' .. closing .. '$')
if selfclosing then
result:insert(markup_inlines{pandoc.Str(selfclosing)})
elseif nospace and first == '' and is_space(inlines[i+1]) then
-- the opening pattern is followed by a space, but the
-- config disallows this.
result:insert(inline)
else
markup = pandoc.Inlines{pandoc.Str(first)}
end
else
result:insert(inline)
end
else
local last = inline.text:match('(.*)' .. closing .. '$')
if last then
markup:insert(pandoc.Str(last))
result:insert(markup_inlines(markup))
markup = nil
else
markup:insert(inline)
end
end
else
local acc = markup or result
acc:insert(inline)
end
end

-- keep unterminated markup
if markup then
markup:remove(1) -- the stripped-down first element
result:insert(start)
result:extend(markup)
end
return result
end

local function markup_inlines (inlines) return {pandoc.RawInline('tex', '\\hl{')} .. inlines .. {pandoc.RawInline('tex', '}')} end

```

**Span.lua**:
```
function Span (span)
if span.classes:includes 'mark' then
return {pandoc.RawInline('latex', '\\hl{')} ..
span.content ..
{pandoc.RawInline('latex', '}')}
end
end
```
This works great, I got this here: [https://gist.github.com/tarleb/a0646da1834318d4f71a780edaf9f870](https://gist.github.com/tarleb/a0646da1834318d4f71a780edaf9f870)

However, for my other usecase I'd like it to be able to render `*==this kind of highlighting==*` as `\colorbox{lightred}{this new kind of highlighting}`

I've tried replacing the `\\hl{` with `\colorbox{declared-color}{` but that didn't work.

I was wondering if it had something to do with the class? But renaming that class from `mark` to `mark-red` didn't work either.

Any advice or ideas? Thanks!

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