How do I separate a string of numbers with commas

[Sir_Lancelot]

I have a string of the following numbers which I would like to separate with commas.

000100002000300040005

Expected:

0001,0002,0003,0004,0005

I do not at any point know the length of the string.

Thanks in advance

[Kurt_Bremser · Accepted solution]

i = 1;
do while (i < length(invar));
  outvar = catx(',',outvar,substr(invar,i,4));
  i + 4;
end;
drop i;

[RW9]

Are they always four characters?  If not how do you know where one starts and one stops?

If they are always four then:

data want;
  str="000100002000300040005";
  length new_str $200;
  do i=0 to lengthn(str)/4;
    new_str=catx(",",new_str,substr(str,(i*4)+1,4));
  end;
run;

However that doesn't get your output as 00002 is not four.  You need to have some logical base to split the string.

[Ksharp]

Just for fun.

data have;
x='00010002000300040005';
length want $ 200;
do i=1 to length(x);
 if mod(i,4)=1 then want=catx(',',want,char(x,i)); 
  else want=cats(want,char(x,i));
end;
run;