MATLAB: How to select the first letter of every word

string

I have no idea how I would go about doing this

Input: I like eating pizza Output: Ilep

str='I like eating pizza'; 
str2=cellfun(@(c) c(1),strsplit(str))

How about using regexp to find the position of spaces, and delete 2nd~Nth spaces? Like:

mystring = 'this is my string';
pos = regexp(mystring,'\s');
mystring(pos(2:end)) = [];

str1 = ('rabbit is eating grass near a tree');
str2 = ('rabbit is sleeping under tree');
str=intersect(strsplit(str1),strsplit(str2))

OR, to maintain the order

str=intersect(strsplit(str1),strsplit(str2),'stable')