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listing folders in directory with specific strings

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I have a directory full of folders. I want to only list (and count) those with a specific naming format that starts with a numerical string and not any other folders in that directory. How can I do this? for example: FolderA contains these subfolders
180705-France, 180705-Germany, refdata
I want to list and count only the folders under folder A that start with a numeric string. In this case, the list should return '180705-France' and '180705-Germany', and a length(dirlist) should return 2.
something like,
pathn =['D:\FolderA'];
list= dir([pathn '\1*']);
len =length(list);
would work, but I need it to work for any folder whose name begins with numbers 0-9.
I tried using regexp but couldn't figure out how to get it to work. If I figure it out, I'll post it here, but I'm sure someone already knows how to do this....thanks.
Stephen23 on 17 Aug 2018
Edited: Stephen23 on 17 Aug 2018
Note that these square brackets do nothing at all:
pathn =['D:\FolderA'];
Square brackets are a concatenation operator, and that code is not concatenating anything together (the char vector is already a char vector). All that is needed is:
pathn = 'D:\FolderA';
Jorge Rivé
Jorge Rivé on 17 Aug 2018
yes, thanks --I know...I started writing the question one way and then simplified it to avoid confusion. The path was a concatenation of strings before I changed it....

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Accepted Answer

Paolo on 16 Aug 2018
Edited: Paolo on 16 Aug 2018
You can work around it with a dos command:
[status,cmdout] = dos("dir *")
list = regexp(cmdout,'\d{6}-[A-Za-z]+','match');
len =length(list);
or alternatively:
s = dir;
list =regexp({},'\d{6}-[A-Za-z]+','match');
len = length(find(~cellfun(@isempty,list)));
  1 Comment
Jorge Rivé
Jorge Rivé on 17 Aug 2018
Edited: Jorge Rivé on 17 Aug 2018
thank you, the dos command version worked, but the alternative provided does not. list returns an array of empty cells.... Your first solution does the trick for me -- Thanks.

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More Answers (1)

Fangjun Jiang
Fangjun Jiang on 16 Aug 2018
dir() does not have the regexp option. I can think of this way


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