They have their crow club where you earn points for rewards or they have the unlimited for $19 a month + 10% off food
Regal has their Unlimited plan. It's about $20 per month. It covers all regal theatres in Knoxville. Is you see at least 2 movies per month it pays for itself. There is a small upcharge for 4D, IMAX, and RPX. Here's a link with more details. https://www.regmovies.com/static/en/us/unlimited
The card is free. If you go out to movies even infrequently it's worth spending time to get it. There is an app that makes it easier to use. They have a monthly membership, it seems okay if you are a frequent flier. There are limitations to it. Check the fine print.
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