bpo-45400: Fix suggestion test of test_exceptions (GH-28783)


Fix test_name_error_suggestions_do_not_trigger_for_too_many_locals()
of test_exceptions if a directory name contains "a1" (like
"Python-3.11.0a1"): use a stricter regular expression.
(cherry picked from commit 4e605666b08b8f863cbbbdaa34bb06988e648d26)

Co-authored-by: Victor Stinner <vstinner@python.org>
diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 82aa79e..143b856 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -1840,7 +1840,7 @@ def f():
             with support.captured_stderr() as err:
                 sys.__excepthook__(*sys.exc_info())
 
-        self.assertNotIn("a1", err.getvalue())
+        self.assertNotRegex(err.getvalue(), r"NameError.*a1")
 
     def test_name_error_with_custom_exceptions(self):
         def f():