I'm sorry you had a rocky start to your cruise. I believe others have posted that it began about 36 hours late?
How has your experience been onboard these past couple of days? Compensation, from Regent or your travel insurance, is definitely something you need to pursue. I hope you can relax enough to enjoy the time you do have onboard. All travel, whether with cruise lines or airlines, is prone to disruption.
We have had delays to Regent cruises that were outside of Regent's control, so different than what you are experiencing (twice there were airport strikes in France so we couldn't fly in to join the ships), but nevertheless distressing. We were able to relax, though, and enjoy the experience onboard before returning home to follow procedures to recoup money lost in the delay. It's frustrating for you, but please try to enjoy your cruise.