How to get common sub string in cell array string?

Example:
cell_arr =
  3×1 cell array
    {'A.A1.A11.A111'                         }
    {'A.A1.A12.A121'                         }
    {'Event_State.Chart.A.A1.A12'}

How to get output = A.A1 ?

Answer 1

[Stephen23]

1- Download and unzip John D'Errico's FEX submission

https://www.mathworks.com/matlabcentral/fileexchange/27460-string-subsequence-tools

2- Modify commonsubstring by replacing every

regexp(..., cellsubstr)

with

regexp(..., regexptranslate('escape',cellsubstr))

3- Call commonsubstrings in a loop, e.g.:

C = {'A.A1.A11.A111','A.A1.A12.A121','Event_State.Chart.A.A1.A12'};
S = C{1};
for k = 2:numel(C)
    S = commonsubstring(S,C{k});
end

This returns the longest common substring (your output example is not the longest common substring):

>> S
S = A.A1.A1

[galaxy]

Thank you for your anwser.

Your anser is same exactly my code. :))

Answer 2

[Bhaskar R]

fund_cell = regexp(cell_arr , 'A.A1', 'match');
result = [fund_cell{:}]

[galaxy]

I see, but that is example only.

We don't know what contains in cell_arr.

> str_common = getStrCommon(cell_arr)
> 
> ans = A.A1

Already many function for get common string in 2 strings as following:

https://www.mathworks.com/matlabcentral/fileexchange/27460-string-subsequence-tools

But I want it more generality.