fix handling of regex cli options

[taybin]

This improves the handling of whitelist-regex and blacklist-regex options which was simply confusing.

Before, you'd need to do something like --whitelist table1,table2 --whitelist-regex true, which also wasn't documented.

This improves it so it functions as desired, so that it can be either --whitelist table1,table2 or --whitelist-regex table1,table2. And so on for the blacklist feature as well.