Add regex advanced example

Author: erikhatcher

docs/40_Analysis/9_advanced.mdx

@@ -10,8 +10,8 @@
 See also: <Link to="https://www.mongodb.com/solutions/solutions-library/as-you-type-suggest-solution">Relevant As-You-Type Suggestions Search Solution</Link>
 
 ## partial matching
-  * `regex`
-  * `wildcard`
+  * <Playground url="https://search-playground.corp.mongodb.com/tools/code-sandbox/snapshots/68a752755ec5d0d84cbffc3b">🔗 `regex`</Playground>
+  * `wildcard`: TODO
 
 ## `moreLikeThis`