Update 3. Get Only What You Need, and Fast.md

Author: ortizfram

Introduction to MongoDB in Python/3. Get Only What You Need, and Fast.md

@@ -13,3 +13,26 @@ You want to examine the laureates of the 1903 prize in physics and how they spli
     db.laureates.find_one({"prizes": {"$elemMatch": {"category": "physics", "year": "1903"}}})
 
 > Which projection(s) will fetch ***ONLY*** the laureates' full names and prize share info? I encourage you to experiment with the console and re-familiarize yourself with the structure of laureate collection documents.
+- [ ] ["firstname", "surname", "prizes"]
+- [ ] ["firstname", "surname", "prizes.share"]
+- [x] {"firstname": 1, "surname": 1, "prizes.share": 1, "_id": 0}
+- [ ] All of the above
+
+## 🦍 Rounding up the G.S. crew
+    { "name": {$regex: "^Py"}    }
+will fetch documents where the field 'name' ***starts with "Py".***
+
+> In this exercise, you will use regular expressions, projection, and list comprehension to collect the full names of laureates whose initials are "G.S.".
+
+- [x] 1. First, use regular expressions to fetch the documents for the laureates whose "firstname" starts with "G" and whose "surname" starts with "S".
+- [x] 2. Use projection and adjust the query to select only the "firstname" and "surname" fields.
+
+```py
+# Find laureates whose first name starts with "G" and last name starts with "S"
+docs = db.laureates.find(
+       filter= {"firstname" : {"$regex" : "^G"},
+                "surname" : {"$regex" : "^S"}  })
+# Print the first document 
+print(docs[0])
+```
+```py