Generate an Error when an input value contains a comma

My question is: is it possible to generate an error pop-up in my UI when an input value contains a comma? For now I got an error pop-up when the input value is not a number by the following code:

if isnan(cv)
    set(hObject, 'String', 0);
    errordlg('Input must be a number','Error');
end

Currently I am copying this code to every variable I enter (which are a lot of variables). This makes the .m-file a little unclear/confusing to read. Is it also possible to set this code as a general code that applies for the whole programm?

Answer 1

[Image Analyst]

if ~isempty(strfind(cv, ','))
  % cv contains a comma
else
  % cv does not contain a comma
end

[Maarten]

Is it also possible to set this code as a general code that applies for the whole program, so that I don't have to copy this code to every variable?

[Image Analyst]

I don't know what you want to do. You could put it into a function and call it every time. If you just want to eliminate commas from the string, you could do it in one line in two ways:

s='adkfsa,lsdjksad,sdlj';
sNoComma = strrep(s, ',', [])
sNoComma = s(s~=',')