Shell Programming and Scripting

Hi, i have a problem with sed

i want to substitude a / to ",""," in the following pattern: number/number

so if u have a file which contains -> "Streetname 9/8/6" it shouldn't substitude anything, only if it is "Streetname 9/6" to "Streetname 9","","6".

Maybe you can help me, i try so many patterns but i'm not really good in shellscript programming

sed -e 's/\//","","/g' filename

this only replaces all / with ",""," but this is very bad for my final file!
my start file looks like this:
"Baumgasse 42/5"
"Prinz Eugen Strasse 34"
"Rudolf-Nurejew-Promenade 1/8/1"
and it needs to look like:
"Baumgasse","42","","5"
"Prinz Eugen Strasse","34"
"Rudolf-Nurejew-Promenade","1","8","1"

i dont want the whole shellscript for it (need to learn it) i just want to know how i can do my above stated problem.
i want to do it like this way sed 's!\( [0-9]*\)/\([0-9]*"\)!","","\1!g'
but i dont know how it works that he only replaces the / in the middle of the two patterns.

Code:

$ cat file
Streetname 9/6
Streetname 9/6/6
$ sed 's/\( [0-9]*\)\/\([0-9]*"\)$/\1","","\2/' file
"Streetname 9","","6"
"Streetname 9/6/6"
$

thank you very much, this solved my problem!

ok got your problem try this....
sed -e 's/[0-9]/","&/1' -e 's/\//","","/g' filename