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    %% Return Substrings Using match Keyword  
% Capture words within a character vector that contain the letter |x|.   

%%  
str = 'EXTRA! The regexp function helps you relax.';
expression = '\w*x\w*';
matchStr = regexp(str,expression,'match') 

%%
% The regular expression |'\w*x\w*'| specifies that the character vector: 
%  

%%
% * Begins with any number of alphanumeric or underscore characters, |\w*|.  

%%
% * Contains the lowercase letter |x|.  

%%
% * Ends with any number of alphanumeric or underscore characters after
% the |x|, including none, as indicated by |\w*|.