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: finish.m
    path of file: ./repos/toolbox/external/m2html/@template/private
    
    the code of the file until where you have to start completion: function str = finish(str,unknowns)
%TEMPLATE/FINISH Apply given strategy to unknown fields in a string
%  STR = FINISH(STR,UNKNOWNS) applies on string STR the strategy defined
%  in UNKNOWNS to unknowns fields '{UNKNOWNS_FIELDS}'.
%  UNKNOWNS may be:
%    * 'keep' to do nothing
%    * 'remove' to remove all undefined fields
%    * 'comment' to replace undefined fields by a warning HTML comment.
%  This function uses Matlab REGEXPREP function coming with R13. If you
%  hold an older version, please comment lines 38 and 42: then you can 
%  only apply the 'keep' strategy.

%  Copyright (C) 2003 Guillaume Flandin <Guillaume@artefact.tk>
%  $Revision: 1.0 $Date: 2003/05/05 22:19:51 $

narginchk(2,2);

switch lower(unknowns)
	case 'keep'

    
function str = finish(str,unknowns)
%TEMPLATE/FINISH Apply given strategy to unknown fields in a string
%  STR = FINISH(STR,UNKNOWNS) applies on string STR the strategy defined
%  in UNKNOWNS to unknowns fields '{UNKNOWNS_FIELDS}'.
%  UNKNOWNS may be:
%    * 'keep' to do nothing
%    * 'remove' to remove all undefined fields
%    * 'comment' to replace undefined fields by a warning HTML comment.
%  This function uses Matlab REGEXPREP function coming with R13. If you
%  hold an older version, please comment lines 38 and 42: then you can 
%  only apply the 'keep' strategy.

%  Copyright (C) 2003 Guillaume Flandin <Guillaume@artefact.tk>
%  $Revision: 1.0 $Date: 2003/05/05 22:19:51 $

narginchk(2,2);

switch lower(unknowns)
	case 'keep'
		%- do nothing
	case 'remove'
		%%%%%%%%%%%%%%%%%%%%%%%% WIH REGEXP ONLY %%%%%%%%%%%%%%%%%%%%
		% str = regexprep(str,'{[^ \t\r\n}]+}','');
		%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	case 'comment'
		%%%%%%%%%%%%%%%%%%%%%%%% WIH REGEXP ONLY %%%%%%%%%%%%%%%%%%%%
		% str = regexprep(str,'{[^ \t\r\n}]+}','<!-- Template variable undefined -->');
		%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	otherwise
		error('[Template] Unknown action.');
end