diff --git a/stdlib/unittest/case.pyi b/stdlib/unittest/case.pyi
index 200f8dbaea23..c75539a97368 100644
--- a/stdlib/unittest/case.pyi
+++ b/stdlib/unittest/case.pyi
@@ -157,18 +157,14 @@ class TestCase:
     def assertRaisesRegex(  # type: ignore[misc]
         self,
         expected_exception: type[BaseException] | tuple[type[BaseException], ...],
-        expected_regex: str | bytes | Pattern[str] | Pattern[bytes],
+        expected_regex: str | Pattern[str],
         callable: Callable[..., Any],
         *args: Any,
         **kwargs: Any,
     ) -> None: ...
     @overload
     def assertRaisesRegex(
-        self,
-        expected_exception: type[_E] | tuple[type[_E], ...],
-        expected_regex: str | bytes | Pattern[str] | Pattern[bytes],
-        *,
-        msg: Any = ...,
+        self, expected_exception: type[_E] | tuple[type[_E], ...], expected_regex: str | Pattern[str], *, msg: Any = ...
     ) -> _AssertRaisesContext[_E]: ...
     @overload
     def assertWarns(  # type: ignore[misc]
@@ -186,18 +182,14 @@ class TestCase:
     def assertWarnsRegex(  # type: ignore[misc]
         self,
         expected_warning: type[Warning] | tuple[type[Warning], ...],
-        expected_regex: str | bytes | Pattern[str] | Pattern[bytes],
+        expected_regex: str | Pattern[str],
         callable: Callable[_P, Any],
         *args: _P.args,
         **kwargs: _P.kwargs,
     ) -> None: ...
     @overload
     def assertWarnsRegex(
-        self,
-        expected_warning: type[Warning] | tuple[type[Warning], ...],
-        expected_regex: str | bytes | Pattern[str] | Pattern[bytes],
-        *,
-        msg: Any = ...,
+        self, expected_warning: type[Warning] | tuple[type[Warning], ...], expected_regex: str | Pattern[str], *, msg: Any = ...
     ) -> _AssertWarnsContext: ...
     def assertLogs(
         self, logger: str | logging.Logger | None = ..., level: int | str | None = ...