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    %% Select Substrings Before Position
% Create strings before specified positions.
%
% Create a string that contains a name.
str = string('Edgar Allen Poe')

%%
% Select the substring before the sixth character.
newStr = extractBefore(str,6)
%%
% Select substrings from each element of a string array. When you specify 
% different positions with numeric arrays, they must be the same size as the 
% input string array.
str = string({'Edgar Allen Poe';'Louisa May Alcott'})
newStr = extractBefore(str,[6;7])

%% 
% Select substrings from each element and specify the same position.
newStr = extractBefore(str,12)