Fix for codeblocks - example/test in playground

Signed-off-by: Dj Walker-Morgan <dj.walker-morgan@enterprisedb.com>

Author: djw-m

advocacy_docs/playground/1/01_examples/code-blocks.mdx

@@ -33,3 +33,13 @@ asdasd
 asdasd
 asdasdafasfa
 </pre>
+
+```sql
+SELECT * FROM aidb.retrieve_text('test_knowledge_base', 'jacket', 2);
+__OUTPUT__
+  key  |                       value                        |      distance
+-------+----------------------------------------------------+--------------------
+ 19337 | United Colors of Benetton Men Stripes Black Jacket | 0.2994317672742334
+ 55018 | Lakme 3 in 1 Orchid  Aqua Shine Lip Color          | 0.3804609668507203
+(2 rows)
+```

src/components/code-block.js

@@ -27,7 +27,8 @@ const splitChildrenIntoCodeAndOutput = (rawChildren) => {
     return [[], []];
   }
 
-  const splitRegex = /(?:\s+|^)__OUTPUT__\s*(?:\n+|$)/;
+  // Simplified regex to split on the __OUTPUT__ marker
+  const splitRegex = /\n__OUTPUT__\n/;
   const code = [];
   const output = [];