how to find a string within a filename?

Question

andrew 2014-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/125848-how-to-find-a-string-within-a-filename

回答： Jos (10584) 2014-4-25

I have a list of filenames and want to search for specific strings within the filenames and have them printed horizontally separated by a ';'. for example I have the following filenames:

apple.doc
apple2.csv
apple3.xls
banana.doc
banana2.csv
banana3.xls

I only want the "apple" files and the final output should be: apple.doc; apple2.csv; apple3.doc

How do I do this?

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Answer 1

Sara 2014-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/125848-how-to-find-a-string-within-a-filename#answer_133444

Try looking up the strfind command.

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Answer 2

Star Strider 2014-4-15

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编辑：Star Strider 2014-4-15

在 MATLAB Online 中打开

Try this:

FileNames = {'apple.doc', 'apple2.csv', 'apple3.xls', 'banana.doc', 'banana2.csv', 'banana3.xls'}
NewFiles = {};
for k1 = 1:size(FileNames,2)
    A = strfind(FileNames{k1}, 'apple');
    if ~isempty(A)
        NewFiles = [NewFiles;  FileNames{k1}];
    end
end

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andrew 2014-4-25

I used this but it returns a double '18' how do I get the string of the doubles

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Answer 3

Jos (10584) 2014-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/125848-how-to-find-a-string-within-a-filename#answer_134559

在 MATLAB Online 中打开

NAMES = {'apple.doc', 'apple2.csv', 'TESTappleTEST.xls', 'banana.doc', 'banana2.csv', 'banana3.xls','APPL_almost.txt'}
C = regexp(NAMES, '.*apple.*', 'match') % find all names with the word apple in it.
outputstr = sprintf('%s;',C{:}) ; % concatenate them in a single row
outputstr = outputstr(1:end-1) ;  remove last semi-colon
disp(outputstr) % show