How can I mat2cell the array?

Suppose I have this:

v= {1 8 1 1 6 1 2 5 3 2 7 11 7 9 10 9};

How can I mat them as below? ( with array start and end as same number)

v= { [1 8 1] [1 6 1] [2 5 3 2] [7 11 7] [9 10 9] };

Answer 1

[Stephen23]

>> v = {1,8,1,1,6,1,2,5,3,2,7,11,7,9,10,9};
>> c = regexp(char([v{:}]),'(.).*?(??$1)','match');
>> c = cellfun(@double,c,'uni',0);
>> c{:}
ans =
     1     8     1
ans =
     1     6     1
ans =
     2     5     3     2
ans =
     7    11     7
ans =
     9    10     9

[Hang Vu]

Thank you so much!^^ you saved me 2 times. I just re-asked for previous question. Could you please take a look if you have time!

Answer 2

[Andrei Bobrov]

 out = mat2cell([v{:}],1,[3,3,4,3,3]);

[Hang Vu]

Thank you for the response!