Conditional with string wildcard

Hi all,

I want to use conditional statement to compare the string name using wild card.

image_folder = 'C:\Users';
filenames = dir(fullfile(image_folder, 'Flat.tif'));
total_images  = numel(filenames); 

full_name = filenames.name;
disp(full_name);

Text1 = 'Tree'*;
Text2 = 'Flat'*;

if strcmp(full_name,Text2)
    disp('OK')
else
    strcmp(full_name,Text1)
    disp('Not OK')

end

But it always comes with the second text "Not OK"

Anyone can help me with that? Thank you in advance

[Stephen23]

This code is confusing:

filenames = dir(fullfile(image_folder, 'Flat.tif'));
total_images  = numel(filenames);
full_name = filenames.name;

Apparently dir is used to match one file. But then on the next line you count the number of files! Why? And if you expect multiple files, then that third line is definitely going to cause some problems when it discards all of the filenames except the first one...

"I want to use conditional statement to compare the string name using wild card."

String comparisons do not have a wildcard. You might be able to use dir (which does include a wildcard) or regular expressions (powerful but more complex), but it is not clear exactly what you are trying to compare and what output you expect.

[hendra kurnia febriawan]

Sorry my question is not clear, I have revised in the below answer

[Stephen23]

hendra kurnia febriawan's "Answer" moved here:

Thanks for the comments. I have many image files in that folder with the name Tree1, Tree2,... and Flat1, Flat2,... and want to use loop that read each image and then using if 'the name Tree' then executing some codes else 'the name is Flat' then executing another code, that's why I am using *, so not detecting the exact file's name. The code should be

filenames = dir(fullfile(image_folder, '*.tif'));
total_images  = numel(filenames);
full_name = filenames.name;

Answer 1

[Steven Lord]

Use startsWith to determine if the file name starts with "Tree" or "Flat".

[hendra kurnia febriawan]

Yeah that works Steven, thank you

   if startsWith(full_name,'Tree')
          disp('Tree')
      else 
          disp('Flat')
      end

Can it be modified to choose not only two parameters tree and flat but also third paramater?

    if startsWith(full_name,'Tree')
        disp('Tree')
    elseif startsWith(full_name,'Tree')
        disp('Flat')
    else
        disp('rock')
    end

Like that?or must use other codes?

Answer 2

[ANKUR KUMAR]

I have taken names as filename.

full_name='Tree'
  Text2 = 'Tree';  %here is you mistake. Remove * from the last
  Text1 = 'Flat'; %here is you mistake. Remove * from the last
  if strcmp(full_name,Text2)
      disp('OK')
  else
      strcmp(full_name,Text1)
      disp('Not OK')
  end

Answer 3

[Dennis]

You should get a warning that

Text1 ='Tree'*;

is no valid syntax (the * is a problem). If you want to use * as a wildcard try regexp. If the wildcard is always only the ending you could use strncmp:

image_folder = 'C:\Users';
filenames = dir(fullfile(image_folder, 'Flat.tif'));
total_images  = numel(filenames); 

full_name = filenames.name;
disp(full_name);

Text1 = 'Tree';
Text2 = 'Flat';

if strncmp(full_name,Text2,length(Text2))
    disp('OK')
else
    strncmp(full_name,Text1,length(Text1))
    disp('Not OK')

end