identify lowercase letters, uppercase letters, numbers and spaces

Hello everybody, I have this code and I would like that in the cases of the switch identify if the character of a given sentence is a lowercase letter, an uppercase or an space. Thank you very much!

sentence='Hello 22';
for ch=1:length(sentence)
    switch sentence(ch)
        case %if it is a lowercase letter
            %blahblah
        case  %if it is an uppercase letter  
            %blahblah
        case %if it is an space
            %blahblah
    end
end

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/isstrprop.html is the only practical routine to use for this purpose. If you do not use it then chances become very high that your code will produce the wrong results for characters such as δ and ή and ř

Answer 2

[John D'Errico]

help ismember