Help with lua filter for docx to latex conversion

[Sandra Martin <sandrushba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hello all, 

I have trouble writing the correct lua filter for my pandoc conversion of 
docx to latex. 

In short, I have citations in the format "\cite{reference}" (csl style from 
Better Bibtex) in my docx file, which I would like to preserve and keep 
unchanged during pandoc conversion.

When calling "pandoc --to=native test.docx", I see that pandoc reads these 
entries as strings and I've tried writing filters with pandoc.RawInline to 
preserve these strings. However, using for instance this function keeps the 
reference keys but gets rid of all the latex formatting (the backslash and 
the curly brackets):
function Str(el)
  local citekey = el.text:match("\\cite[{](%w+)[}]")
  if citekey then
    return pandoc.RawInline('latex', citekey)
  end
end

How do I keep my latex-styled reference strings as they are during pandoc 
conversion? 

Thanks in advance!
Sandra

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