Why am I unable to preserve upper case letters using REGEXPREP in MATLAB 7.4 (R2007a)?

I want to replace parameters in my ascii file using REGEXPREP associated with its option "preservecase".

In command line I realize:

   script('filtering_P.script',{'<TSInput1_File_Name>';'<Filter_Type>';'<Frequency1>';'<Frequency2>'},{'d:\Test.RSP';'UPPERCASE';'10';'20'})

My "script" function is:

function script(file,otext,ntext)

%script: replace parameter in a script file

%

% Edit_Script  : This function finds and replaces parameter in a script file

%

%       file:           text file name (with or without path)

%       otext:          text to be replaced (old text)

%       ntext:          replacing text (new text)

%

%

ntext_nonprinting=regexprep(ntext,'\','\\\\\\\', 'preservecase');

ntext=ntext_nonprinting;

% Obtaining the file full path

[fpath,fname,fext] = fileparts(file);

if isempty(fpath)

      out_path = pwd;

elseif fpath(1)=='.'

      out_path = [pwd filesep fpath];

else

      out_path = fpath;

end

% Reading the file contents

k=1;

fid = fopen([out_path filesep fname fext],'r');

while 1

      line{k} = fgetl(fid);

      if ~ischar(line{k})

          break;

      end

      k=k+1;

end

fclose(fid);

%Number of lines

nlines = length(line)-1;

change_counter=0;

for i=1:nlines

      if ~isempty(regexp(line{i},otext))

          line{i} = regexprep(line{i},otext,ntext, 'preservecase');

          change_counter = change_counter + 1;

      end

end

if change_counter~=0

      % Writing to file

      fid2 = fopen([out_path filesep fname fext],'w');

      for i=1:nlines

          fprintf(fid2,[line{i} '\n']);

      end

      fclose(fid2);

end

In my ascii file I don't obtain the expected result:

 SetProperty(FastFourierFilter1,Type,UPPERCASE)

but

 SetProperty(FastFourierFilter1,Type,Uppercase)

Upper Case letters are not preserved.

Answer 1

[MathWorks Support Team]

Upper case letters can be preserved using the option "matchcase" of REGEXPREP in MATLAB 7.4 (R2007a).