From bd5333b6ab16489b8a0419fdb9a80c0dfb8ab2f6 Mon Sep 17 00:00:00 2001
From: eric8810 <ericted8810@gmail.com>
Date: Tue, 26 Aug 2025 12:50:03 +0800
Subject: [PATCH] Fix regex patterns in DeepSeekV31ToolParser to use non-greedy
 matching

Change greedy .* to non-greedy .*? in tool call regex patterns to prevent
over-matching when parsing function names and arguments in tool calls.
---
 .../openai/tool_parsers/deepseekv31_tool_parser.py            | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/vllm/entrypoints/openai/tool_parsers/deepseekv31_tool_parser.py b/vllm/entrypoints/openai/tool_parsers/deepseekv31_tool_parser.py
index ff9188190f3f..bd7c6c8ecee8 100644
--- a/vllm/entrypoints/openai/tool_parsers/deepseekv31_tool_parser.py
+++ b/vllm/entrypoints/openai/tool_parsers/deepseekv31_tool_parser.py
@@ -39,11 +39,11 @@ def __init__(self, tokenizer: AnyTokenizer):
         self.tool_call_end_token: str = "<｜tool▁call▁end｜>"
 
         self.tool_call_regex = re.compile(
-            r"<｜tool▁call▁begin｜>(?P<function_name>.*)<｜tool▁sep｜>(?P<function_arguments>.*)<｜tool▁call▁end｜>"
+            r"<｜tool▁call▁begin｜>(?P<function_name>.*?)<｜tool▁sep｜>(?P<function_arguments>.*?)<｜tool▁call▁end｜>"
         )
 
         self.stream_tool_call_portion_regex = re.compile(
-            r"(?P<function_name>.*)<｜tool▁sep｜>(?P<function_arguments>.*)")
+            r"(?P<function_name>.*?)<｜tool▁sep｜>(?P<function_arguments>.*)")
 
         self.stream_tool_call_name_regex = re.compile(
             r"(?P<function_name>.*)<｜tool▁sep｜>")