Database
[{name:"STYLE",params:["DREAMS-FEEDING","DREAMS-PARI","SOFT"]},{name:"BRAND",params:["DREAMS","FEATHERLINE"]}]
Query
db.collection.find({name:"STYLE",params:{$regex:"DREAMS"}},{name:1,params:{$filter:{input:"$params",cond:{$regexMatch:{input:"$$this",regex:"DREAMS"}}}}})