find a string in a text file and to check particular character

Question

Vipin Mohan 2014-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/155881-find-a-string-in-a-text-file-and-to-check-particular-character

编辑： Vipin Mohan 2014-9-23

I have following texts in a file:

...

 RECORD_A
 BE_FUNC
  1; "scalar"; 1.0; 0.0; 2; 0
    ACCEPT;ACCEPT
    9; 1; 0; 0; 0
    ACCEPT;ACCEPT
    -5; 1;5.1; 0; 0
 EN_FUNC
 GIBT_ER

...

In this file 'RECORD_A' , 'BE_FUNC', 'EN_FUNC' , 'GIBT_ER' are unique strings . I am copying each line from a file and printing to another file.(let line number of BE_FUNC is 'n'). Now, I want to check if the line is equal to ' BE_FUNC ' ,then i want to check what is there in the 5th position (delimiter ';') in the next line (that is line n+1, here it is : 1; "scalar"; 1.0; 0.0; 2; 0 and the values are varying depends on the some other inputs ) and at the same time i have to print BE_FUNC to the other file as told already. And if it is '2' i have to check line n+3 and n+5 line (but need to print n,n+1,n+2,n+3,n+4,n+5 etc. as it is ) if it is '3' i have to check n+3,n+5,n+7 line (but need to print n,n+1,n+2,n+3,n+4,n+5,n+6,n+7 etc. as it is ).

main problem is : i have to complete one loop to print 'BE_FUNC' before going to n+1 line.

Here is my uncompleted program:

 fid_old= fopen('dummyfile.txt','r+'); %read from temp file
 fid_new= fopen ('newfile.txt','wt');   % creating a new  file
 while 1
    tline = fgetl(fid_old);
    if ~ischar(tline)
        break
    end
    if strfind(tline,'BE_FUNC')==1
        disp('Here your help needed, Thank you')
    end
    fprintf(fid_new,tline);
    fprintf(fid_new,'\n');
 end
 fclose(fid_old);
 fclose(fid_new);

And Everything in a single while loop is pretty much expected.

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Answer 1

Sreeram Mohan 2014-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/155881-find-a-string-in-a-text-file-and-to-check-particular-character#answer_152629

Hi Vipin,

Have you tried using strtok ? This might be more useful in the case you are dealing with.

Thanks,

Sreeram Mohan

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Vipin Mohan 2014-9-23

编辑：Vipin Mohan 2014-9-23

hi, the problem is i have to print it on the same time !!! I have to check and print 'BE_FUNC', and if it yes, i have to go to next line to find out the character '2' in the next line..and strtok can be used in the n+1 line only... before that i have to print!!!!!! i have to complete one loop to print 'BE_FUNC' before going to n+1 line.

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