Given your input I would write the regex as follows:

Match everything that:

• Is separated on the left side by the "/" symbol
• Is separated on the right side by the "/" symbol or end of string ($)
• Contains only numbers and dots (".")

It should be pretty straightforward to write such a regex and less complex than what you originally had.

Edit: OK, sorry, my example wouldn't match this as a version string: "v007". In this case it gets a bit more complicated.