Update quick start examples (#120)

examples/usage/srt_example_regex.py

@@ -0,0 +1,24 @@
+from sglang import function, gen, set_default_backend, Runtime
+
+
+IP_ADDR_REGEX = r"((25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(25[0-5]|2[0-4]\d|[01]?\d\d?)"
+
+
+@function
+def regex_gen(s):
+    s += "Q: What is the IP address of the Google DNS servers?\n"
+    s += "A: " + gen(
+        "answer",
+        temperature=0,
+        regex=IP_ADDR_REGEX,
+    )
+
+
+runtime = Runtime(model_path="meta-llama/Llama-2-7b-chat-hf")
+set_default_backend(runtime)
+
+state = regex_gen.run()
+
+print(state.text())
+
+runtime.shutdown()