How to select next specific line based on string present in previous line and copy the line also from a text file?

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POKA
POKA 2017-7-22
评论： Walter Roberson 2017-7-22
x='$RAIM';
y='$GPGGA';
fid=fopen('myfile.txt');
while ~feof(fid)
tline = fgetl(fid);
if contains(tline,x)
fprintf(id,'%s\n',tline)
end
end
fclose(fid)
% Input file contents
$RAIM,002212,003080,000818,001156,020000,020000,000777,001098,111,3,11111111*32
$GPGGA,151943.50,1257.32717,N,07738.23927,E,2,09,0.87,823.3,M,,M,,*44.
if second last column of RAIM line is 5 not 3 then only select GPGGA line otherwise go to next line.

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采纳的回答

Walter Roberson
Walter Roberson 2017-7-22
S = fileread('myfile.txt');
gpgga_lines = regexp(S, '(?<=^\$RAIM,.*,5,[^,]*$)\$GPGGA,.*$', 'match', 'lineanchors', 'dotexceptnewline');
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POKA
POKA 2017-7-22
%How to write two if condition in matlab
% I want to try below logic while pulling out RAIM line having 5 in 67 position
x='$RAIM'
while ~feof(fid)
tline = fgetl(fid);
if contains(tline,x) && contains(tline,tline(:,67)==5)
fprintf(fid,'%s\n',tline)
fclose(fid)
Walter Roberson
Walter Roberson 2017-7-22
p1 = '$RAIM'; p2 = '$GPGGA';
selecting_data = false;
while ~feof(fid)
tline = fgetl(fid);
if ~ischar(tline); break; end; %end of file
if strncmp(tline, p1, length(p1))
selecting_data = tline(67) == '5';
fprintf(fid, '%s\n', tline);
elseif selecting_data && strncmp(tline, p2, length(p2))
fprintf(fid, '%s\n', tline);
end
end
fclose(fid);

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