Refs #28462 -- Fixed 'invalid escape sequence' warning on Python 3.6+.
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@ -1636,7 +1636,7 @@ class ModelAdmin(BaseModelAdmin):
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def _get_edited_object_pks(self, request, prefix):
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"""Return POST data values of list_editable primary keys."""
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pk_pattern = re.compile('{}-\d+-{}$'.format(prefix, self.model._meta.pk.name))
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pk_pattern = re.compile(r'{}-\d+-{}$'.format(prefix, self.model._meta.pk.name))
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return [value for key, value in request.POST.items() if pk_pattern.match(key)]
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def _get_list_editable_queryset(self, request, prefix):
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