How to remove certain lines of text in a text file

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jgillis16 2015-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/224389-how-to-remove-certain-lines-of-text-in-a-text-file

评论： Star Strider 2015-6-18

I am trying to remove certain lines of text present in one text file. All these lines needing to be removed are present in another text file I have created. Both are attached. The text file that needs the removal is labeled 'SAMPLEFILE.txt', while the file containing the lines to be removed from 'SAMPLEFILE.txt' is named 'NewGalaxy.txt'.

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jgillis16 2015-6-18

files were posted for reference. I need help writing the code.

Star Strider 2015-6-18

For context, see also: Removing certain lines in a text file by setting a restriction

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Answer 1

Jan 2015-6-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/224389-how-to-remove-certain-lines-of-text-in-a-text-file#answer_183155

在 MATLAB Online 中打开

DataS = fileread('SAMPLEFILE.txt');
% Perhaps you have to fix the linebreaks:
DataS = strrep(DataS, char([13,10]), char(10));
Data  = regexp(DataS, char(10), 'split');
PatternS = fileread('NewGalaxy.txt');
PatternS = strrep(PatternS , char([13,10]), char(10));
Pattern  = regexp(PatternS , char(10), 'split');
Match = setdiff(Data, Pattern);
% Do you want to create a new file?
fid = fopen('NewFile.txt', 'w');
if fid < 0; error('Cannot open file.'); end
fprintf(fid, '%s\n', Match{:});
fclose(fid);