fast regex decode

Auto-detect constant str path in regex FSM, then extend instead.

benchmark/json_fast_forward/README.md

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+## Run benchmark
+
+### Dependencies
+
+```
+llama_cpp_python          0.2.32
+guidance                  0.1.10
+vllm                      0.2.7
+outlines                  0.0.24
+```
+
+### Benchmark sglang
+
+Run Llama-7B
+
+```
+python3 -m sglang.launch_server --model-path meta-llama/Llama-2-7b-chat-hf --port 30000 
+```
+
+Benchmark
+
+```
+python3 bench_sglang.py
+```
+
+### Benchmark vllm
+
+Run Llama-7B
+
+```
+python3 -m outlines.serve.serve --tokenizer-mode auto --model meta-llama/Llama-2-7b-chat-hf  --disable-log-requests --port 21000
+```
+
+Benchmark
+
+```
+python3 bench_other.py --backend vllm
+```
+
+### Benchmark guidance (seems not supported)
+
+Run Llama-7B and benchmark
+
+```
+python3 bench_other.py --backend guidance --parallel 1
+```