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How to Remove files that don't match string?

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Ibro Tutic
Ibro Tutic on 10 May 2017
Commented: dpb on 10 May 2017
I have a list of filenames, and I am trying to remove any files that don't have the string 'Z1P', 'Z2P', or 'Z1G' in them.
The file names are stored in a cell array called Files.
Thanks for any help.

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Answers (2)

Guillaume
Guillaume on 10 May 2017
The easiest, assuming R2016b or later, is to use contains:
filteredarray = yourcellarray(contains(yourcellarray, 'Z1P') & contains(yourcellarray, 'Z1P') & contains(yourcellarray, 'Z1G'))

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Guillaume
Guillaume on 10 May 2017
If it's an or, then
filteredarray = yourcellarray(contains(yourcellarray, {'Z1P', 'Z2P', 'Z1G'}));
In versions < R2016b, the simplest way may be to use regexp:
filteredarray = yourcellarray(~isempty(regexp(yourcellarray, 'Z1P|Z2P|Z1G', 'once')));
Ibro Tutic
Ibro Tutic on 10 May 2017
Would it be possible to do this on a structure?
Guillaume
Guillaume on 10 May 2017
If by structure you mean the structure returned by dir:
filteredstruct = dirstruct(~isempty(regexp({dirstruct.name}, 'Z1P|Z2P|Z1G', 'once')));

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dpb
dpb on 10 May 2017
Edited: dpb on 10 May 2017
If anywhere in the filename, then
UnwantedStrings={'Z1P', 'Z2P', and 'Z1G'};
Files=Files(~ismember(upper(Files),'UnwantedStrings);
If it's an extension or needs must be in the filename and not extension, use fileparts first to separate pieces needed.

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Guillaume
Guillaume on 10 May 2017
I don't thing that this is going to work. ismember does not find strings within strings.
If it were to work, the order within ismember would need to change.
Ibro Tutic
Ibro Tutic on 10 May 2017
Not sure if you might have just miss-named that variable, but those are the strings that I want. i.e. if the file has Z1P, keep it or Z2P keep it, etc.
dpb
dpb on 10 May 2017
Guillaume -- DOH! you're right. regexpi it is...
Ibro--oh, ok, it doesn't work anyway, but read it as to keep everything but. So, if it worked otherwise, lose the ~.

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