%lookBehindBoundary Creates a pattern that looks behind for a match
%   NEWPAT = lookBehindBoundary(PAT) returns a pattern that looks behind for a
%   match. The matching characters will not be included in the result.
%
%   Examples
%       STR = "reduce reuse recycle compost";
%       PAT = lookBehindBoundary("re") + lettersPattern;
%       extract(STR,PAT)                   % returns  ["duce"; "use"; "cycle"]
%
%   See also pattern, lookAheadBoundary, optionalPattern, contains, extract.

%   Copyright 2019-2020 The MathWorks, Inc.