diff --git a/backends/bn_adapter.py b/backends/bn_adapter.py
index 487e9d6..e6c38e7 100644
--- a/backends/bn_adapter.py
+++ b/backends/bn_adapter.py
@@ -306,7 +306,7 @@ def _sanitize_asm(self, text: str, keep_labels: bool = False) -> tuple[str, List
                 if re.match(r"^\s*\.", s):
                     # e.g., .intel_syntax, .text, .globl
                     continue
-                if re.match(r"^(?i)(global|extern|extrn)\b", s):
+                if re.match(r"^(global|extern|extrn)\b", s, re.IGNORECASE):
                     continue
             lines.append(s)
             mapping.append(idx)
diff --git a/backends/validator.py b/backends/validator.py
index f5f6d4b..0739715 100644
--- a/backends/validator.py
+++ b/backends/validator.py
@@ -83,7 +83,8 @@ def _parse_sequence(self, s: str) -> Optional[bytes]:
 
     def match_patterns(self, data: bytes) -> List[PatternMatch]:
         matches: List[PatternMatch] = []
-        hexstr = data.hex()
+        hexstr = " ".join(f"{x:02x}" for x in data)
+        print(hexstr)
         for p in self.patterns:
             if not p.enabled:
                 continue
@@ -117,7 +118,7 @@ def match_patterns(self, data: bytes) -> List[PatternMatch]:
                 offs = []
                 for m in rx.finditer(hexstr):
                     # Map hex index to byte offset: every 2 hex chars per byte
-                    start = m.start() // 2
+                    start = len(hexstr[: m.start()].replace(" ", "")) // 2
                     offs.append(start)
                 if offs:
                     matches.append(PatternMatch(pattern=p, offsets=offs))