[{"firstname":"This is first name 1","email":"This is email 1"},{"firstname":"This is first name 2","email":"This is email 2"},{"firstname":"This is first name 3","email":"This is email 3"},{"firstname":"This is first name 4","email":"This is email 4"},{"firstname":"This is first name 5","email":"This is email 5"}]

db.collection.find({$or:[{"firstname":{"$regex":"^THIS IS FIRST NAME 1$","$options":"i"}},{"email":{"$regex":"^This is email$","$options":"i"}}]})