Replace string in text file

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Kian 2020-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/578703-replace-string-in-text-file

回答： kuchina mani chandra 2023-4-3

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

I have a txt file in which there are a bunch of lines. The first two lines are shown below:

10125731872 50  3731  -9999    307    166  -9999    827   4090  -9999    587    332      5  -9999
10125731873 50   117    322      9  -9999    187    300   1273    280    103  -9999     39  -9999

I need to add an "M" after all -9999 values. In a text editor this would be simply done by using the replace tool while looking for all "-9999 " and replacing them with "-9999M". Simple! But I have a hard time doing the same thing in Matlab.

Any idea how I can do this simple task?

Thanks.

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采纳的回答

Walter Roberson 2020-8-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/578703-replace-string-in-text-file#answer_478779

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filename = 'a_txt_file.txt';
new_filename = ['new_' filename];
S = fileread(filename);
S = regexprep(S, '-9999\>', '$&M');
fid = fopen(new_filename, 'w');
fwrite(fid, S);
fclose(fid);

It is recommended that new_filename be different than filename: otherwise if something goes wrong in the writing process, you could lose your only copy of the input.

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Walter Roberson 2020-8-12

编辑：Walter Roberson 2020-8-12

在 MATLAB Online 中打开

regexprep(S, '-9999( |$)', '-9999M', 'lineanchors' )

Kian 2020-8-12

Thanks a lot. This is really neat!

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kuchina mani chandra 2023-4-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/578703-replace-string-in-text-file#answer_1207629

Function replaceStringIntxtFile(filepath,stringToReplace,ReplaceWith) Filedata = readlines(filepath); replacedFiledata =replace(Filedata,stringToReplace,ReplaceWith); F=fopen(filepath,'w'); fprintf(f,'%s\n'replacedFiledata); fclose(f) end