Do You Regret Selling Your Turntable and Albums ?

No. I don’t at all. 
I had a decent TT for the time, a B&O T2.  I really loved it. But when CD’s firmly took over as my music source, I sold the TT. That was sometime in the 90’s. I really don’t remember exactly when. Don’t miss vinyl a bit. 

I sold off my analog gear around 2012 but regretted it a few years later.  There are a favorite old albums not available digitally or poorly transferred digitally.  I purchased another analog rig and only own about 30 LPs

I have around 1800 records, but over the years, I have culled stuff I don't listen to anymore. There is a middle ground between keeping-tossing it all. So far I have not missed any of the records I let go, but immensely enjoy all the new stuff that I am getting.
I still have some of my teen records, but have discarded many others as well. And just in case I am missing something, I can rather easily buy it again (e.g., Mike Oldfield, Jean Michel Jare, Grateful Dead). Those that are very rare I still keep even if they are not quite up my alley anymore (e.g., Vorkriegsjugend double single, Teufelskraut sampler, Rough Mixes from Switzerland octagonal pink, Sperma "Züripunx/Sinnlos" single: 1 on discogs for $371!!!). 

“Do You Regret Selling Your Turntable and Albums?”

Asked and answered as the saying goes.

Both adult sons getting into vinyl. Onward.