Currently, we allow using a value as a regexp. Unfortunately, the delimiter for values, ,, overlaps with some regexp syntax, requiring quoting in certain instances.

Let's move to having a beginning delimiter that properly quotes values in a regexp with having to do full string quotes:

foo~=/<regexp>/

This should allow changing the quote character:

foo~=|<regexp>|

This can avoid cases where one needs to match on slashes. Obviously, we would also continue to support quoting for the heavy lifting cases.