How to check for strings in a cell array using ismember.

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Hi, I have a cell array as follows:

B =

8x1 cell

17x1 cell

11x1 cell

12x1 cell;

Where each cell containts an array of strings e.g. B{1,1} = ['b12', 'b44', a17']

I would like to check the entire cell array B for specific strings, such as 'b12', and output the index.

I tried using ismember

ismember(A{i}(j,1), B), where A is the specific string

but the following error code is shown:

Input A of class cell and input B of class cell must be cell arrays of character vectors, unless one is a character vector.

I have also tried the following: any(strcmp(B,A{i}(j,1))) to no avail as this shows the same result for all strings of A, even if they dont exist in B.

Edit: A little more context, A is also a cell array, where i references the cell in the cell array, and j refereneces the specific entry in that cell. I would like to search for each specific entry, i.e. j, in every cell of B.