You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: xml_findstr.m
    path of file: ./repos/ExploreASL/External/SPMmodified/@xmltree/private
    
    the code of the file until where you have to start completion: function k = xml_findstr(s,p,i,n)
%XML_FINDSTR Find one string within another
%   K = XML_FINDSTR(TEXT,PATTERN) returns the starting indices of any 
%   occurrences of the string PATTERN in the string TEXT.
%
%   K = XML_FINDSTR(TEXT,PATTERN,INDICE) returns the starting indices 
%   equal or greater than INDICE of occurrences of the string PATTERN
%   in the string TEXT. By default, INDICE equals to one.
%
%   K = XML_FINDSTR(TEXT,PATTERN,INDICE,NBOCCUR) returns the NBOCCUR 
%   starting indices equal or greater than INDICE of occurrences of
%   the string PATTERN in the string TEXT. By default, INDICE equals
%   to one and NBOCCUR equals to Inf.
%
%   Examples
%       s = 'How much wood would a woodchuck chuck?';
%       xml_findstr(s,' ') returns [4 9 14 20 22 32]
%       xml_findstr(s,' ',10) returns [14 20 22 32]

    
function k = xml_findstr(s,p,i,n)
%XML_FINDSTR Find one string within another
%   K = XML_FINDSTR(TEXT,PATTERN) returns the starting indices of any 
%   occurrences of the string PATTERN in the string TEXT.
%
%   K = XML_FINDSTR(TEXT,PATTERN,INDICE) returns the starting indices 
%   equal or greater than INDICE of occurrences of the string PATTERN
%   in the string TEXT. By default, INDICE equals to one.
%
%   K = XML_FINDSTR(TEXT,PATTERN,INDICE,NBOCCUR) returns the NBOCCUR 
%   starting indices equal or greater than INDICE of occurrences of
%   the string PATTERN in the string TEXT. By default, INDICE equals
%   to one and NBOCCUR equals to Inf.
%
%   Examples
%       s = 'How much wood would a woodchuck chuck?';
%       xml_findstr(s,' ') returns [4 9 14 20 22 32]
%       xml_findstr(s,' ',10) returns [14 20 22 32]
%       xml_findstr(s,' ',10,1) returns 14
%
%   See also STRFIND, FINDSTR
%__________________________________________________________________________
% Copyright (C) 2002-2011  http://www.artefact.tk/

% Guillaume Flandin
% $Id: xml_findstr.m 4460 2011-09-05 14:52:16Z guillaume $

%error(sprintf('Missing MEX-file: %s', mfilename));

persistent runonce
if isempty(runonce)
    warning(sprintf(['xml_findstr is not compiled for your platform.\n'...
    'This will result in a slowdown of the XML parsing.']));
    runonce = 1;
end