[{_id:ObjectId("6616851ed50d6d1451fa8176"),phone:"+7(926)458-54-52",name:"Aboba"},{phone:"+7===+++|||9....2++++6458-54-52",name:"Aboba THREE"},{phone:"+7ssss9xxxx2yyyy6dddd-458-54-52",name:"Aboba two"},{phone:"+7===+++|||9....2++++6458-54-52",name:"Aboba THREE"}]

db.collection.find({phone:{$regex:"\\D*7\\D*9\\D*2\\D*6\\D*",$options:"i"}})