[Bugfix] Migrate to REGEX Library to prevent catastrophic backtracking (#18454)

Signed-off-by: Crucifixion-Fxl <xmufxl@gmail.com>
Co-authored-by: Crucifixion-Fxl <xmufxl@gmail.com>

benchmarks/benchmark_serving_structured_output.py

@@ -672,7 +672,7 @@ async def benchmark(
 def evaluate(ret, args):
     def _eval_correctness_json(expected, actual):
         # extract json string from string using regex
-        import re
+        import regex as re
 
         actual = actual.replace("\n", "").replace(" ", "").strip()
         try:
@@ -687,7 +687,7 @@ def evaluate(ret, args):
         return actual in args.choice
 
     def _eval_correctness_regex(expected, actual):
-        import re
+        import regex as re
 
         return re.match(args.regex, actual) is not None