getting a specific paragraph from a .txt file

Question

Jamie Shelley 2016-7-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/295707-getting-a-specific-paragraph-from-a-txt-file

评论： Jamie Shelley 2016-7-16

This might sound like a stupid question, but is there was way of retrieving a specific paragraph from a .txt file please? I've written the conditions for various experiments in a txt file, so like

test1
-
-
test2
-
-

and so on. I was wondering if I could say get the user to input the test number (on a gui) and then use a strcat function to merge test and the number and then somehow retrieve the paragraph that corresponds to that number so I can then display it on the gui. Is there a way of doing that please?

Thanks

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Answer 1

Walter Roberson 2016-7-15

1
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https://ww2.mathworks.cn/matlabcentral/answers/295707-getting-a-specific-paragraph-from-a-txt-file#answer_228710

在 MATLAB Online 中打开

filecontent = fileread('YourFile.txt');
testnum = 2;
par_begin_pos = regexp(filecontent, sprintf('^test%d', testnum), 'lineanchors');
if isempty(par_begin_pos)
  fprintf('No paragraph #%d in file', testnum);
  return
end
par_end_pos = regexp(filecontent, sprintf('^test%d', testnum+1), 'lineanchors');
if isempty(par_end_pos)
  par_end_pos = length(filecontent) + 1;    %right test was last thing in file
end
paragraph_content = filecontent(par_begin_pos : par_end_pos - 1);