streak in a character array

how might i find the max streak number for a character array?

ex: something like 'aaaaBBc'

would return 4 because thats the longest streak

I have this and it only works for streaks with capital letters for some reason

cArr = 'aaaaBBc'
if ischar(cArr) == 1 && isempty(cArr) == 0
    for i = 2:length(cArr)
        if cArr(i) == cArr(i-1)
            streak = streak + 1;
        else
            if streak > maxStreak
                maxStreak = streak;
            end
            streak = 1;
        end
    end
    res = maxStreak;

Answer 1

[Simon Chan]

Sorry that I overlooked the question in my previous answer, here is the updated one:

cArr = 'aaaaBBc';
pos = find(diff([0,diff(cArr)==0,0])==1);
neg = find(diff([0,diff(cArr)==0,0])==-1);
if isempty(neg-pos)
    maxStreak = 1
else
    maxStreak = max(neg-pos)+1
end

maxStreak = 4

[Elena]

thank you!

Answer 2

[Mahmoud Ashraf]

cArr = 'aaaaBBc';
streak=0;
maxStreak=0;
if ischar(cArr) == 1 && isempty(cArr) == 0
    for i = 2:length(cArr)
        if cArr(i) == cArr(i-1)
            streak = streak + 1;
        else
            if streak > maxStreak
                maxStreak = streak;
            end
            streak = 1;
        end
    end
    res = maxStreak;
end