MATLAB: Change string of text into multiple lines

formatlistoutputtext filetext;textscantxt

I have a string of text that needs to be formatted and saved as a txt file. The string is in this format:
,1,1880802442166,1,751702411341,1,751702411358,1,751702411365,1,751702411372,1,751702411389,1,751702459060,1,751702459077,1,751702459084,3,751702459091,1,751702459107,1,751702459114,2,751702459121,1,751702459145…
It needs to be output in this format:
,1,1880802442166
,1,751702411341
,1,751702411358
,1,751702411365
,1,751702411372
,1,751702411389
,1,751702459060
,1,751702459077
,1,751702459084
,3,751702459091
,1,751702459107
,1,751702459114
,2,751702459121
,1,751702459145…
It's for an inventory list that was recorded in the wrong format.
Thanks in advance,
Nick

Best Answer

s=',1,1880802442166,1,751702411341,1,751702411358,1,751702411365,1,751702411372,1,751702411389,1,751702459060,1,751702459077,1,751702459084,3,751702459091,1,751702459107,1,751702459114,2,751702459121,1,751702459145'
a=regexp(s,',','split')
a(1)=[]
b=reshape(a,2,[])'
c=cellfun(@(x,y)  [',' x  ','  y], b(:,1),b(:,2),'un',0)
fid=fopen('file.txt','w')
for k=1:numel(c)
  fprintf(fid,'%s \r\n',c{k,:})
end
fclose(fid)
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