REGEX help please

Hi,

I have 2 issues concerning regex:

1) change a string of:
number\number\number to number/number/number

for example:
2\0 to 2/0
3\1\2 to 3/1/2


2) change a string of:
numbers to digit/digit/digit

for example:
321 to 3/2/1
18 to 1/8

Please help me with the PHP code, I have tried many hours and I
couldn't get it to work, thanks.

.

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