How to replace different variables with a single variable in a text file?

Hello everybody! I am not so used to editing and working with .txt files in MATLAB. I am looking for ways to replace multiple set of characters like '=' , '+', '-' with any single character like '%'. I guess I need to use regexprep for this purpose, but I am not able to figure it out for the .txt file. Any help will be appreciated. Thanks

[Bob Thompson]

What do you mean by not being able to figure it out for the .txt file?

[Tiasa Ghosh]

I meant if the input is a cell array, it can be worked out by specifying each cell as cell{} and replacing, but how should I do it for a .txt file with several lines?

Answer 1

[Akira Agata]

Here is a simple example on how to use regexprep to replace '=','+','-' with '%'.

strIn = 'Please replace multiple set of characters like =, +, - with %';
strOut = regexprep(strIn,'[=+-]','%');

The result becomes:

>> strOut
strOut =
  'Please replace multiple set of characters like %, %, % with %'

[Tiasa Ghosh]

Thank you for your response. I am trying to work with a .txt file here. so if the input is a .txt file, how does the format of the regexprep work? I tried this:

fid = fopen('replacedFile.txt','wt');
fprintf(fid,'%s',regexprep('myFile.txt','[=+()]','%'));
fclose(fid);

I know it is wrong since it just creates a .txt file with 'myFile.txt' as one line.

[Tiasa Ghosh]

Silly mistake on my part I used fileread first to get the inputdata. Thank you again.