fid=fopen('file.txt')
a=fgetl(fid)
k=0
while ischar(a)
k=k+1
r{k,1}=a
a=fgetl(fid)
end
fclose(fid)
id=find(~cellfun(@isempty,regexp(r,'5480')))
c=regexp(r(id-1),'\d+','match')
out=str2double(c{1})
If this repeats in your file
id=find(~cellfun(@isempty,regexp(r,'5480')))
for k=1:numel(id)
c=regexp(r(id(k)-1),'\d+','match')
out(k)=str2double(c{1})
end
