How to make the 81st column stand out in Lua?

Question

Like this for Vim, I'm trying to convert (with no success):

matchadd('ColorColumn', '\%81v\s*\zs\S', 100)

from vimscript to a Lua autocmd:

autocmd({'BufRead'}, {
    pattern = "*",
    callback = function ()
       vim.fn.matchadd('ColorColumn', '\\%81v\\s*\\zs\\S')
    end
})

What am I doing wrong?

Answer 1

Have you tried:

autocmd({'BufRead'}, {
    pattern = "*",
    callback = function ()
       vim.fn.matchadd('ColorColumn', '\\%81v\\s*\\zs\\S', 100)
    end
})

Optional verify that the ColorColumn is defined:

vim.api.nvim_set_hl(0, "CursorColumn", { ctermbg = 0 })