Change String by pattern

Hi.
Have a preatty easy question. I need the simplest way to do this:

I have Strings like: 12399, 12500, 12204, 1208, 07
I need them to be like this: "123/ 99", "123/ 00", 122/ 04", "12/ 08", "/ 07"

Please note that the last two is valid.
The pattern is "xxxx/ yy" where yy is mandatory.

Any ideas?
kristian_grAsked:
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CEHJConnect With a Mentor Commented:
Try
s = s.replaceAll("(\\d*)(\\d{2})", "$1/$2");

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CEHJCommented:
:-)
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