How to dissect a file path and keep extension Matlab

I have my file path in a string :

path = 'D:\Users\Documents\MATLAB\capella_to_matlab.txt'

How can i put only the extension in an other string (Not just for this file but for any file i put in path variable) for example :

extension = '.txt'

Thanks for helping !

Answer 1

[Stephen23]

Do NOT use path as a variable name! This shadows the important inbuilt path function.

To get the file extension use fileparts:

>> P ='D:\Users\Documents\MATLAB\capella_to_matlab.txt';
>> [~,~,E] = fileparts(P)
E = '.txt'

[Lucas S]

Thank you very much !