Testing nummber

[Gladox114 1]

I know that "not nil" is wrong but how to test if the input is a nummber and do something when input is a nummber.

 

read = io.read()
if string.match(read, "(%d+)") == not nil then
-- do something
end

 

[Molinko 43]

local input = io.read()
if not tonumber(input) then
  -- input is not a number
end