It is possible to combine $regex and $search operator?

Question

I want to perform a find using a field that is a string array

"tags": ["tag","lóngword", "word", "test"]

I want this document match as result if i search for lóngword, longword or lon

For the accents marks I have read that I can create an index and use the $text operator. This just works with lóngword and longword, but it is not working with lón

I am making this query:

db.getCollection('course').find({$text: {$search: "longword", $diacriticSensitive: false}})

I thought in doing something like this:

db.getCollection('course').find({$text: {$search: {$regex: "lón"}, $diacriticSensitive: false}})

But I get this error:

Error: error: {
    "ok" : 0,
    "errmsg" : "\"$search\" had the wrong type. Expected string, found object",
    "code" : 14,
    "codeName" : "TypeMismatch"
}