Little-publicized, to the point that even Support might not be in the loop: the Visibility Rule Contains operator does allow multiple values.
The Contains value is interpreted as a full-fledged regular expression, so use the pipe character | to separate sub-values:
In fact, because of this unexpected/undocumented power, you must anchor an expression to avoid surprises:
^(TX|FL|PA)$ Otherwise, it's doing a partial match of the full value against each of your pipe-delimited alternatives. This might not be a problem on your forms right now, but if it becomes a problem, you wouldn't know about it immediately.
For example, if you were using uppercase state names, then
Contains KANSAS|IDAHO
would match both ARKANSAS and KANSAS, and you should use
Contains ^(KANSAS|IDAHO)$
instead.
You can also of course do more fancy matches with regexes if you want. And Not Contains is also a regex!
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