\d for digits! Thank you

very nice!

Thanks so much! I did the most inefficient solution and had no idea this existed. I was reading all about 'regex' but still was coming up dry.

Could you tell me how it works,please ?

I prefer this way of doing it over the current best practice.
Python is "EAFP" (Easier to ask for forgiveness than permission) and so
error handling appears to be the way to go to me.