[{"firstName":"John","lastName":"Doe","favoriteFoods":[{"name":"Cheeseburgers"},{"name":"Broccoli"},{"name":"Cheeseburgers"}]}]

db.collection.aggregate([{"$unwind":"$favoriteFoods"},{"$match":{"favoriteFoods.name":{"$regex":"chee","$options":"i"}}},{"$project":{"food":"$favoriteFoods.name"}}])