[Bugfix] improve regex for hermes tool detection

Signed-off-by: Adrien <adrien@huggingface.co>

Author: XciD

vllm/entrypoints/openai/tool_parsers/hermes_tool_parser.py

@@ -44,7 +44,7 @@ def __init__(self, tokenizer: AnyTokenizer):
         self.tool_call_end_token: str = "</tool_call>"
 
         self.tool_call_regex = re.compile(
-            r"<tool_call>(.*?)</tool_call>|<tool_call>(.*)", re.DOTALL)
+            r"(?:<tool_call>)+(.*?)</tool_call>|<tool_call>(.*)", re.DOTALL)
         self.scratch_pad_regex = re.compile(
             r"<scratch_pad>(.*?)</scratch_pad>", re.DOTALL)