This may be more convoluted than it needs to be, however it has the virtue of returning the desired result. I know of no other relatively straightforward way of getting the result you want.
Try this --
imshow(imread('Immagine.png'))
LD = load('matlab_data.mat')
data = LD.data
idx1 = cellfun(@(x)strmatch(x,'[Wsp]'), data, Unif=0);
idx(1) = find(cellfun(@(x)~isempty(x), idx1));
idx2 = cellfun(@(x) strmatch(x, '[Wsp\DetachedWindows]'), data, Unif=0);
idx(2) = find(cellfun(@(x)~isempty(x), idx2)) % Indices Constraining The Resuls
WCstr = cellfun(@(x)strfind(x,'WindowCount = '), data, Unif=0); % Find The Position Of The Requested String
WCidx = find(cellfun(@(x)~isempty(x), WCstr)); % Associated Indices
Outidx = WCidx > idx(1) & WCidx < idx(2); % Compare To Constraints
WCmatch = regexp(data(WCidx(Outidx)), '\d', 'match'); % Extract Numerical VAlue
WCnr = str2double(WCmatch{:}) % Convert To 'double'
data(WCidx(Outidx)) % Explanation -- The 'regexp' Call Analyses This String And Returns The Number
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