How to use vim.bo.syntax with StrikeoutMatch in Neovim

Question

How to convert this:

" txt strikeout ~~ (background black) ~~
au BufRead,BufNewFile *.txt   syntax match StrikeoutMatch /\~\~.*\~\~/
hi def  StrikeoutColor   ctermbg=016 ctermfg=black
hi link StrikeoutMatch StrikeoutColor

To neovim lua using probably vim.api.nvim_create_autocmd, I would like to prevent using:

vim.cmd([[
  augroup StrikeoutMatch
    autocmd!
    autocmd BufRead,BufNewFile *.txt syntax match StrikeoutMatch /\~\~.*\~\~/
  augroup END
]])

Answer 1

See "Autocmd Functions" in Neovim API to use vim.api.nvim_create_autocmd and vim.api.nvim_set_hl to set Highlight groups.

To set your pattern/regexp, you could use VIM function matchadd via vim.fn.matchadd.

You could convert your code in Lua:

vim.api.nvim_create_autocmd({'BufRead', 'BufNewFile'}, {
  group = vim.api.nvim_create_augroup('StrikeoutMatch', { clear = true }),
  pattern = { '*.txt' },
  callback = function()
    vim.fn.matchadd('StrikeoutMatch', '\\~\\~.*\\~\\~')
    vim.api.nvim_set_hl(0, 'StrikeoutColor', { bg=016, fg='Black' })
    vim.api.nvim_set_hl(0, 'StrikeoutMatch', { link='StrikeoutColor' })
  end,
})