hi
sorry i don't speak verry well english
if writed !calc hi
====>The answer to the equation hi = 0 !!!
use alias better than on input event
must use $strip cose maby one user use a color text, bold or underline the command will not execute
so better to do
if ($strip($1) == !calc) <cmd>
but u have to add conditions to ensure that the $2 is calculated or not
so i thing that useless