How to include backslashes in facet filter?

Hey, sorry if this is already detailed in the docs, but I couldn’t seem to find it.

If I have a backslash in a string that I want to filter by, such as exa\mple string, how do I go about escaping the backslash? Is escaping required at all?

Would I do Facet:"exa\\\\mple string"?
Or Facet:"exa\\mple string"?

Or something else entirely?