regexp on string containg a path separated with slashes

Question

I need to parse some string containing this common text:

sources ID {number}/{number}/....

I'm trying with a regexp like this:

sources ID (\d+)(/(\d+)?/(\d+)?)?

here my tests: https://regex101.com/r/1PYe02/1

• string (1) is parsed correctly, but the second matching group has two elements /1441/1443
• string (2) and (3) are parsed correctly
• string (4) matches only first elements

where I'm doing it wrong?