splitem.lua

-- split all selected lines at \N

function argh(sub,sel)
	for i = #sel,1,-1 do
		local v = sel[i]
		local line = sub[v]
		line.text = line.text:gsub("\\[Nn]",string.char(6))
		for a in line.text:reverse():gfind(("[^%s]+"):format(string.char(6))) do
			line.text = a:reverse()
			sub.insert(v+1,line)
		end
		sub.delete(v)
	end
end

aegisub.register_macro("split errything","do it",argh)