Group characters and form a matrix in Matlab

Question

I have 26 characters A to Z, I group 4 characters together and separate the following 4 characters by a space which is like this:

abcd efgh ijkl mnop qrst uvwx y         


        

Answer 1

Another approach using regular expressions:

str = 'abcdefghijklmnopqrstuvwxyz';
str = regexprep(str, '(.{4})', '$1 ');
str = regexprep(str, '(.{4} .{4}) ', '$1\n');