[{"contentId":"62738f2fba6155003dd1e25d","tags":["spring boot","spring jpa"]},{"contentId":"62738f98ba6155003dd1e25e","tags":["spring","java"]}]

db.collection.aggregate([{$project:{d:{$filter:{input:"$tags",as:"num",cond:{$regexMatch:{input:"$$num",regex:".*spr.*"}}}}}}])