Update task.py: try to find json in task output using regex (#491)

* Update task.py: try to find json in task output using regex

Sometimes the model replies with a valid and additional text, let's try to extract and validate it first. It's cheaper than calling LLM for that.

* Update task.py

---------

Co-authored-by: João Moura <joaomdmoura@gmail.com>

src/crewai/task.py

@@ -1,3 +1,4 @@
+import re
 import threading
 import uuid
 from typing import Any, Dict, List, Optional, Type
@@ -246,7 +247,16 @@ class Task(BaseModel):
                     return exported_result.model_dump()
                 return exported_result
             except Exception:
-                pass
+              # sometimes the response contains valid JSON in the middle of text
+              match = re.search(r"({.*})", result, re.DOTALL)
+              if match:
+                  try:
+                      exported_result = model.model_validate_json(match.group(0))
+                      if self.output_json:
+                          return exported_result.model_dump()
+                      return exported_result
+                  except Exception:
+                      pass
 
             llm = self.agent.function_calling_llm or self.agent.llm