How to delete a substring within a string

I have a string like this

a={ {'a', 'b', 'c','d'},{''}, {'e', 'f', 'g', 'h'},{''} }

where the two '' are empty {1x1 cell} substrings within the string. How do I delete empty substring like this and end up with

a={ {'a', 'b', 'c','d'}, {'e', 'f', 'g', 'h'} }

[Jan]

You do not delete a "substring" from a "string", but specific "cell elements", which are a scalar cell string containing the empty string.

Answer 1

[James Tursa]

Assuming the cells to be deleted are all of the form {''}, you could simply use the isequal function. E.g.

x = cellfun(@(y)isequal(y,{''}),a);
a(x) = [];

If there could be other forms of elements that you would consider "empty", you would need to tell us what that could be.