Add regex support to FTS command/queries

It would be very useful for querying FTS indexes to support regular expressions in the "search" field/parameter.

If you are indexing and querying non-standard/language text content, there are use cases where you would want to know about substrings.

Using the example content below, it would be nice to be able to say:

firstTest18 AND -someText AND /.*Wrong22$/

Example Content
firstTest18 worked well, but there was an exception of type: SomethingThatVariesWrong22