Use backend filter for findDupes and handle excep.

pylib/anki/find.py

@@ -3,7 +3,7 @@
 
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Optional, Set
+from typing import TYPE_CHECKING, Optional, Set, Tuple
 
 from anki.hooks import *
 from anki.utils import ids2str, splitFields, stripHTMLMedia
@@ -71,9 +71,7 @@ def findDupes(
     col: Collection, fieldName: str, search: str = ""
 ) -> List[Tuple[Any, List]]:
     # limit search to notes with applicable field name
-    if search:
-        search = "(" + search + ") "
-    search += '"%s:*"' % fieldName.replace('"', '"')
+    search = col.search_string(searches=[search], field_name=fieldName)
     # go through notes
     vals: Dict[str, List[int]] = {}
     dupes = []

qt/aqt/browser.py

@@ -1688,7 +1688,12 @@ where id in %s"""
 
     def duplicatesReport(self, web, fname, search, frm, web_context):
         self.mw.progress.start()
-        res = self.mw.col.findDupes(fname, search)
+        try:
+            res = self.mw.col.findDupes(fname, search)
+        except InvalidInput as e:
+            self.mw.progress.finish()
+            show_invalid_search_error(e)
+            return
         if not self._dupesButton:
             self._dupesButton = b = frm.buttonBox.addButton(
                 tr(TR.BROWSING_TAG_DUPLICATES), QDialogButtonBox.ActionRole