I don't know about the best, but you could look at Ragel:
Ragel compiles executable finite state machines from regular languages. Ragel targets C, C++, Objective-C, D, Java and Ruby. Ragel state machines can not only recognize byte sequences as regular expression machines do, but can also execute code at arbitrary points in the recognition of a regular language.
请参考我对这个问题的回答，SMC 还可以生成 C++ 代码。 我无法评论生成的 C++ 的质量，但对于 C# 来说它是令人满意的。
Please refer to the answer I gave to this question, SMC can also generate C++ code. I can't comment on the quality of the generated C++ but for C# it's satisfactory.
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我不知道最好的，但你可以看看 Ragel :
I don't know about the best, but you could look at Ragel:
请参考我对这个问题的回答，SMC 还可以生成 C++ 代码。 我无法评论生成的 C++ 的质量，但对于 C# 来说它是令人满意的。
Please refer to the answer I gave to this question, SMC can also generate C++ code. I can't comment on the quality of the generated C++ but for C# it's satisfactory.