diff --git a/src/formpack/utils/expand_content.py b/src/formpack/utils/expand_content.py
index 2b9774f..71030b7 100644
--- a/src/formpack/utils/expand_content.py
+++ b/src/formpack/utils/expand_content.py
@@ -303,7 +303,7 @@ def _mark_special(**kwargs: str) -> None:
 def _expand_type_to_dict(type_str: str) -> Dict[str, Union[str, bool]]:
     SELECT_PATTERN = r'^({select_type})\s+(\S+)$'
     out = {}
-    match = re.search('\s+(or.other)$', type_str)
+    match = re.search(r'\s+(or.other)$', type_str)
     if match:
         type_str = type_str.replace(match.groups()[0], '').strip()
         out[OR_OTHER_COLUMN] = True
diff --git a/tests/test_exports.py b/tests/test_exports.py
index 42773a6..70f299a 100644
--- a/tests/test_exports.py
+++ b/tests/test_exports.py
@@ -444,7 +444,7 @@ def test_simple_nested_grouped_repeatable(self):
         with TempDir() as d:
             xls = d / 'foo.xlsx'
             export.to_xlsx(xls, submissions)
-            assert xls.isfile()
+            assert xls.is_file()
 
     def test_repeats(self):
         title, schemas, submissions = build_fixture('grouped_repeatable')
@@ -1889,7 +1889,7 @@ def test_xlsx(self):
         with TempDir() as d:
             xls = d / 'foo.xlsx'
             fp.export(**options).to_xlsx(xls, submissions)
-            assert xls.isfile()
+            assert xls.is_file()
 
     def test_xlsx_with_types(self):
         title, schemas, submissions = build_fixture('nested_grouped_repeatable')
@@ -1899,7 +1899,7 @@ def test_xlsx_with_types(self):
         with TempDir() as d:
             xls = d / 'foo.xlsx'
             fp.export(**options).to_xlsx(xls, submissions)
-            assert xls.isfile()
+            assert xls.is_file()
 
     def test_xlsx_long_sheet_names_and_invalid_chars(self):
         title, schemas, submissions = build_fixture('long_names')
@@ -1912,7 +1912,7 @@ def test_xlsx_long_sheet_names_and_invalid_chars(self):
         with TempDir() as d:
             xls = d / 'foo.xlsx'
             fp.export(**options).to_xlsx(xls, submissions)
-            assert xls.isfile()
+            assert xls.is_file()
             book = openpyxl.load_workbook(xls)
             assert book.sheetnames == [
                 'long survey name_ the quick,...',
@@ -1943,7 +1943,7 @@ def test_xlsx_too_long_string(self):
         with TempDir() as d:
             xls = d / 'foo.xlsx'
             fp.export().to_xlsx(xls, submissions)
-            assert xls.isfile()
+            assert xls.is_file()
             book = openpyxl.load_workbook(xls)
             sheet = book[title]
             row_values = [cell.value for cell in sheet[2]]
@@ -1974,7 +1974,7 @@ def test_xlsx_too_long_url(self):
         with TempDir() as d:
             xls = d / 'foo.xlsx'
             fp.export().to_xlsx(xls, submissions)
-            assert xls.isfile()
+            assert xls.is_file()
             book = openpyxl.load_workbook(xls)
             sheet = book[title]
             row_values = [cell.value for cell in sheet[2]]
@@ -2018,7 +2018,7 @@ def test_xlsx_with_tag_headers(self):
         with TempDir() as d:
             xls = d / 'foo.xlsx'
             fp.export(**options).to_xlsx(xls, submissions)
-            assert xls.isfile()
+            assert xls.is_file()
             book = openpyxl.load_workbook(xls, data_only=True)
             # Verify main sheet
             sheet = book['Household survey with HXL an...']
@@ -2159,7 +2159,7 @@ def test_copy_fields_and_force_index_and_unicode(self):
         with TempDir() as d:
             xls = d / 'test.xlsx'
             fp.export().to_xlsx(xls, submissions)
-            assert xls.isfile()
+            assert xls.is_file()
 
     def test_copy_fields_multiple_versions(self):
         title, schemas, submissions = restaurant_profile