Numbering of repeating string in text file

Hi,

I have a repeating string as following:

materialIndex [
  25,  36,  26,  21,-1,
  21,  21,  21,  21,-1,
  47,  36,  39,-1,
  etc.
  
materialIndex [
  47,  36,  37,  47,-1,
  56,  54,  47,  47,-1,
  47,  35,  36,  47,-1,
  etc.

I would like to number these strings as following or similar:

materialIndex1 [
  25,  36,  26,  21,-1,
  21,  21,  21,  21,-1,
  47,  36,  39,-1,
  etc.
  
materialIndex2 [
  47,  36,  37,  47,-1,
  56,  54,  47,  47,-1,
  47,  35,  36,  47,-1,
  etc.

I couldn't find a solution so far to this problem.

[Ameer Hamza]

Is this inside a txt file, or the string are loaded in MATLAB?

[Daniel Rohrer]

It's from a text file, and I've loaded the string into MATLAB. Both ways are possible

[KSSV]

How did you load it into MATLAB?

[Daniel Rohrer]

I used following code:

% Convert wrl to txt (ASCII)
files=dir('*.wrl');                   
for i=1:length(files)
    filename=files(i).name;
    [pathstr, name, ext] = fileparts(filename);
    copyfile(filename, fullfile(pathstr, [name '.txt']))
end

% Open specific file, erase and replace syntax
fid  = fopen(filename,'r');
f=fread(fid,'*char')';
fclose(fid);

Answer 1

[Ameer Hamza]

There can be several ways to do this. The following shows a method using a regular expression.

First, define a helper function and save it in a file.

function y = helperFun()
    persistent n
    if isempty(n)
        n = 1;
    end
    y = num2str(n);
    n = n+1;
end

then use the following code

str = fileread('test.txt'); % test.txt is name of text file
clear helperFun
new_str = regexprep(str, '(materialIndex)', '$1${helperFun()}')

[Daniel Rohrer]

Thank you, works as intended!

[Ameer Hamza]

I am glad to be of help!