fix: exclude subobject refs from required pages detection

Item:OSW<id>#OSW<subid> subobject references were incorrectly matched
as standalone Item:OSW<subid> required pages. Added negative lookbehind
for # to the Item regex pattern.

Author: simontaurus

src/osw/controller/page_package.py

@@ -71,8 +71,8 @@
         group_keys=["file"],
     ),
     "Item strings": RegExPatternExtended(
-        description="Match: Item:OSW<uuid>",
-        pattern=r"(Item:OSW[a-f0-9]{32})",
+        description="Match: Item:OSW<uuid> but not subobject refs after #",
+        pattern=r"(?<!#)(Item:OSW[a-f0-9]{32})",
         group_keys=["item"],
     ),
 }

src/osw/utils/regex.py

@@ -181,7 +181,15 @@ def count_match_groups(pattern: Union[str, re.Pattern]):
             group_count += 1
             unmatched_brackets -= 1
 
-    corrected_group_count = group_count - pattern.count("(?:")
+    # Subtract non-capturing groups and zero-width assertions
+    non_capturing = (
+        pattern.count("(?:")
+        + pattern.count("(?=")
+        + pattern.count("(?!")
+        + pattern.count("(?<=")
+        + pattern.count("(?<!")
+    )
+    corrected_group_count = group_count - non_capturing
     return corrected_group_count