Dat.standard(1).name = 'x';
Dat.standard(2).name = 'xZ1P';
Dat.standard(3).name = 'x';
Dat.standard(4).name = 'xZ1G';
Dat.standard(5).name = 'x';
Dat.standard(1).data = 1;
Dat.standard(2).data = 2;
Dat.standard(3).data = 3;
Dat.standard(4).data = 4;
Dat.standard(5).data = 5;
C = {'Z1P','Z1G','Z1K'};
S = Dat.standard;
fun = @(s)cellfun('isempty',regexp(s,C,'once'));
idx = cellfun(@(s)any(~fun(s)),{S.name});
Srt.standard = S(idx);
Where Srt.standard contains a structure array which is a subset of Dat.standard, where the names contain any of the strings in C.
Note: in general you should store your data in the simplest array/structure possible. In this case nested structures do not make working with your data simpler, but actually make it more complicated. It might be worth considering if you could simplify the data organization somehow.
