MATLAB: How to replace a string with another string in specific table columns

MATLAB

Hello,
Im trying to replace all [] with '-99' only in the columns that begin with Q_ in the table t below. How would I do that with an index ? Its important that I dont use the variables names.
% data
Q_x = {'1'; '[]'; '3'};
a = {'A'; 'B'; 'C'};
o = {'A'; '[]'; 'C'};
Q_y = {'1'; '[]'; '3'};
t = table(Q_x, a, o, Q_y)
all_vars = t.Properties.VariableNames;
index = find(strncmp(all_vars, 'Q_', 2));
Thank you,

Best Answer

t{:,index} = regexprep(t{:,index},'\[\]','-99')
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