MATLAB: ARRANGING TEXT FILE

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Hi,
I am working on a dynamic analysis. I am trying to run ANSYS on MATLAB. Therefore I have to change some value in my text file. Text file is large but i need to change e few line as follows;
 loadvari47rotz(2,1,1) = *0.174532925199433*    ??CHANGING_LINE-1
 loadvari47rotz(3,1,1) = *0.349065850398866*    ??CHANGING_LINE-2
I want to change above value for each step. Text file is at attachment and you can find changing lines CTRL+F "??CHANGING_LINE-1" and "??CHANGING_LINE-1".
I will be so happy if you help me.
Best Regards, Ahmet TATAR

Best Answer

Here is an example, and then we can tailor the solution to your needs from there:
 content = fileread( 'TEST.txt' ) ;
 content = regexprep( content, '(?<=_loadvari47rotz\(2,1,1\) = )\S+', sprintf( '%f', 0.123 )) ;
 content = regexprep( content, '(?<=_loadvari47rotz\(3,1,1\) = )\S+', sprintf( '%f', 0.456 )) ;
 fId = fopen( 'TEST_updated.txt', 'w' ) ;
 fwrite( fId, content ) ;
 fclose( fId ) ;
This can easily be updated for matching/replacing other parts, looping through files, etc.
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