Fixed prefix fraud_

app.py

@@ -215,21 +215,28 @@ def extract_json_from_markdown(text: str) -> str:
     """
     Extract JSON content from markdown code block.
     Handles cases where the LLM wraps the output in ```json ... ```
+    Cleans up problematic escape characters for json.loads.
     """
     # Look for ```json ... ```
     match = re.search(r'```(?:json)?\s*\n?(.*?)\n?```', text, re.DOTALL | re.IGNORECASE)
     if match:
         json_str = match.group(1).strip()
     else:
-        # Fallback: strip any leading/trailing whitespace and assume it's raw JSON
         json_str = text.strip()
     
-    # Clean up common issues: remove extra newlines, fix quotes if needed
-    json_str = re.sub(r'\n\s*', ' ', json_str)  # Collapse newlines to spaces
-    json_str = re.sub(r'\\n', ' ', json_str)   # Replace escaped newlines
+    # Remove LLM-inserted escape sequences like \$ or \"
+    # First, convert escaped newlines and tabs to spaces
+    json_str = json_str.replace('\\n', ' ').replace('\\t', ' ')
+    
+    # Then remove unneeded backslashes before non-JSON characters
+    json_str = re.sub(r'\\(?=[^"\\/bfnrtu])', '', json_str)
+    
+    # Collapse multiple spaces
+    json_str = re.sub(r'\s+', ' ', json_str).strip()
     
     return json_str
 
+
 # --- FASTAPI ENDPOINTS ---
 @app.get("/")
 async def root():