Skip this answer, if you don't use go driver.
filter := bson.M{"field_name": primitive.Regex{ Pattern: keyword, Options: "", },}cursor, err := GetCollection().Find(ctx, filter)Use regex in $in query, mongodb doc: https://docs.mongodb.com/manual/reference/operator/query/in/#use-the-in-operator-with-a-regular-expression
filter := bson.M{"field_name": bson.M{"$in": []primitive.Regex{ { Pattern: keyword, Options: "", }, } }}cursor, err := GetCollection().Find(ctx, filter)
