MATLAB is designed to work neatly and efficiently with arrays. Rather than doing things one-at-a-time like that, you should be using arrays. For example:
A = "title: the cat in the hat";
old = [ "the", "cat", "in", "hat"];
new = ["seven","brides","for","brothers"];
Method one: REPLACE():
Z = replace(A,old,new)
Method two: REGEXPREP():
B = regexprep(A,old,new)
Method three: STRREP() in a loop:
C = A;
for k = 1:numel(old)
C = strrep(C,old{k},new{k});
end
display(C)
