<think> tag is missing. (#7256)

### What problem does this PR solve?

Some models force thinking, resulting in the absence of the think tag in
the returned content

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

agent/component/exesql.py

@@ -61,7 +61,7 @@ class ExeSQL(Generate, ABC):
     component_name = "ExeSQL"
 
     def _refactor(self, ans):
-        ans = re.sub(r"<think>.*</think>", "", ans, flags=re.DOTALL)
+        ans = re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)
         match = re.search(r"```sql\s*(.*?)\s*```", ans, re.DOTALL)
         if match:
             ans = match.group(1)  # Query content

agent/component/generate.py

@@ -200,7 +200,7 @@ class Generate(ComponentBase):
         if len(msg) < 2:
             msg.append({"role": "user", "content": "Output: "})
         ans = chat_mdl.chat(msg[0]["content"], msg[1:], self._param.gen_conf())
-        ans = re.sub(r"<think>.*</think>", "", ans, flags=re.DOTALL)
+        ans = re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)
 
         if self._param.cite and "chunks" in retrieval_res.columns:
             res = self.set_cite(retrieval_res, ans)

agent/component/keyword.py

@@ -57,7 +57,7 @@ class KeywordExtract(Generate, ABC):
         ans = chat_mdl.chat(self._param.get_prompt(), [{"role": "user", "content": query}],
                             self._param.gen_conf())
 
-        ans = re.sub(r"<think>.*</think>", "", ans, flags=re.DOTALL)
+        ans = re.sub(r"^.*</think>", "", ans, flags=re.DOTALL)
         ans = re.sub(r".*keyword:", "", ans).strip()
         logging.debug(f"ans: {ans}")
         return KeywordExtract.be_output(ans)