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########################################################################
##
## Copyright (C) 1996-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{n} =} rindex (@var{s}, @var{t})
## Return the position of the last occurrence of the character string
## @var{t} in the character string @var{s}, or 0 if no occurrence is
## found.
##
## @var{s} may also be a string array or cell array of strings.
##
## For example:
##
## @example
## @group
## rindex ("Teststring", "t")
## @result{} 6
## @end group
## @end example
##
## The @code{rindex} function is equivalent to @code{index} with
## @var{direction} set to @qcode{"last"}.
##
## @seealso{find, index}
## @end deftypefn
function n = rindex (s, t)
if (nargin != 2)
print_usage ();
endif
n = index (s, t, "last");
endfunction
%!assert (rindex ("foobarbaz", "b"), 7)
%!assert (rindex ("foobarbaz", "o"), 3)
%!test
%! str = char ("Hello", "World", "Goodbye", "World");
%! assert (rindex (str, "o"), [5; 2; 3; 2]);
%! str = cellstr (str);
%! assert (rindex (str, "o"), [5; 2; 3; 2]);
## Test input validation
%!error <Invalid call> rindex ()
%!error rindex ("foo")
%!error rindex ("foo", "bar", "last")
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