Lua - numeric_table

function validation(subs,sel)
  if aegisub.frame_from_ms() then
    return true, "True"
  else
    return false, "False"
  end
end

function nothing()
    return numeric_table({26, 28, "30-33"}, "37", {_G, {38, "-23--2"}}) -- select a few lines
--~     return nil
end

function numeric_table(...)
    -- Values that are going to be returned
    local values = {}
    -- Table that holds already parsed tables' references for avoiding infinite loops
    local circular = {}

    local function resolve_recursive(t, callback)
        if not type(t) == "table" then return nil; end

        circular[t] = true
        -- Iterate over all values
        for _, v in pairs(t) do
            if type(v) == "table" then
                -- Value is another table, recursive call
                -- But only if it has not already been parsed, since we have those values already
                if not circular[v] then
                    resolve_recursive(v, callback)
                end
            else
                callback(v)
            end
        end
    end
    local function parse_value(v)
        -- Check the value for different types and interpret it
        if type(v) == "number" then
            -- Just a number
            table.insert(values, v)
        elseif type(v) == "string" then
            local low, high = v:match("^(-?%d+)-(-?%d+)$")
            -- A range of numbers
            if low and high then
                for low = low, high do
                    table.insert(values, low)
                end
            -- The string is convertable
            elseif tonumber(v) then
                table.insert(values, tonumber(v))
            end
        end
    end

    -- Iteterate over all params
    resolve_recursive({...}, parse_value)
    for i, v in ipairs(values) do
        aegisub.log(string.format("values[%d] = %d\n", i, v))
    end
    return values or nil
end

aegisub.register_macro("Test","True",nothing,validation)