MATLAB: Manipulating text files

.txt filesMATLAB

I have a .txt file structured as below:
title
name 00xxxx yyyy
name 00xxxx yyyy
in each line the first n characters describe a name, followed by 67-n spaces, then a 6 digit code starting with 2 zeros and after 9 spaces a 4 digit codes. What i need to do is copy the xxxx numbers to the place of the yyyy numbers in all lines of the file and save it back to .txt file by maintaining the exact structure in the output file. How could i handle something like that in matlab ?
Thanks in advance

Best Answer

fi=fopen('YourFile.txt','r');
fo=fopen('outfile.txt','w');
txtcell=textscan(fi,'%s','delimiter','\n');
Str1Idx=1;
Str2Idx=68;
Str3Idx=82;
StrLen=86;
for i=1:length(txtcell{1})
    if(length(txtcell{1}{i})==StrLen)
        txtcell{1}{i}((Str3Idx):(Str3Idx+4))=txtcell{1}{i}((Str2Idx+2):(Str2Idx+6));
    end
    fprintf(fo,strcat(txtcell{1}{i},'\n'));
end
fclose(fi);
fclose(fo);
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