I am trying to make a calculator (please dont ask why). I need to test if the last 2 letters of a text are something (for example if there are two - characters i will make it not possible to add more) but the last letters could be like 15th and 16th or 47th and 48th letter. Also, if there is a mathematical equation on a text, is it possible to count it?
Why? 
Is it possible? Yes. You can do all sorts of things, using the expressions detailed here and the variables explained here.
Good luck 
Thank you very much for helping! I will later today go see this, but im pretty sure you just solved my every problem. Have a nice day!
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