if string is abc return value

Hi.

I have filename is string and then I want to find specific name.

if filename have ' a ' xxx = 1

if filename have ' b ' xxx = 2

if filename have ' c ' xxx = 3

thank you.

[Jan]

Please explain more details. What does "filename have ' a '" mean? Start with an 'a' or contain an 'a' anywhere?

if filename(1) == 'a'

or

if any(filename == 'a')

[Jassy]

Thank you for your assistance.

"filename have ' a '" mean?

I mean filename is #####a .jpg

[Adam Danz]

So these are all =1?

• aaaaa.jpg
• axxxx.jpg
• a.jpg

What about this?

• xxA.jpg (capital letter
• xxxx.app (file extension)

[Jan]

With the space between the "a" and the ".jpg"? What should happen for "b#####a .jpg"? Is "#" a digit? Please do not let the readers guess the details.

[Jassy]

All filename is not have a,b,c in the same file.

Ex. Z1q0001a , Z2q0002a

Z1q0001b , Z2q0002b

Z4f0001c , Dsf0002c

and not have

• xxA.jpg
• xxxx.app

because all filename have a,b,c each file.

[Adam Danz]

what if filename has 'a' and 'b' what value does it get?

This question needs to be defined more clearly.

[Adam Danz]

So, it's always the last letter of the filename?

Answer 1

[Jan]

Maybe:

[fPath, fName, fExt] = fileparts(filename);
if endsWith(fName, 'a ')  % With the space as in your example
    xxx = 1;
elseif endsWith(fName, 'b ')
    xxx = 2;
    ... etc
end

Or:

[fPath, fName, fExt] = fileparts(filename);
switch fname(end-1)  % Again assuming you mean the 2nd last character
    case 'a'
        xxx = 1;
    case 'b'
        xxx = 2
        ... etc
    otherwise
        error('Unexpected charatcer')
end

[Jassy]

Thank you so much. It saved me

and next time I will give detail more than this.

Answer 2

[Adam Danz]

The cell array 'key' lists all possible last-characters and the order determines the value.

filename = 'Z2q0002b.jpg';
[~, fName] = fileparts(filename);
key = {'a' 'b' 'c'}; 
xxx = find(strcmp(key, fName(end))); 

xxx =
     2