Improvement: update pytest.raises document adding PEP-678 __notes__

src/_pytest/_code/code.py

@@ -710,7 +710,7 @@ class ExceptionInfo(Generic[E]):
                 *getattr(self.value, "__notes__", []),
             ]
         )
-        msg = f"Regex pattern did not match.\n Regex: {regexp!r}\n str(exception): {value!r}"
+        msg = f"Regex pattern did not match.\n Regex: {regexp!r}\n Input: {value!r}"
         if regexp == value:
             msg += "\n Did you mean to `re.escape()` the regex?"
         assert re.search(regexp, value), msg

src/_pytest/python_api.py

@@ -812,7 +812,8 @@ def raises(  # noqa: F811
     :kwparam str | typing.Pattern[str] | None match:
         If specified, a string containing a regular expression,
         or a regular expression object, that is tested against the string
-        representation of the exception using :func:`re.search`.
+        representation or `PEP-678 <https://peps.python.org/pep-0678/>` `__notes__`
+        of the exception using :func:`re.search`.
 
         To match a literal string that may contain :ref:`special characters
         <re-syntax>`, the pattern can first be escaped with :func:`re.escape`.

testing/code/test_excinfo.py

@@ -434,7 +434,7 @@ def test_match_raises_error(pytester: Pytester) -> None:
     match = [
         r"E .* AssertionError: Regex pattern did not match.",
         r"E .* Regex: '\[123\]\+'",
-        r"E .* str\(exception\): 'division by zero'",
+        r"E .* Input: 'division by zero'",
     ]
     result.stdout.re_match_lines(match)
     result.stdout.no_fnmatch_line("*__tracebackhide__ = True*")

testing/python/raises.py

@@ -196,7 +196,7 @@ class TestRaises:
         expr = (
             "Regex pattern did not match.\n"
             f" Regex: {msg!r}\n"
-            " str(exception): \"invalid literal for int() with base 10: 'asdf'\""
+            " Input: \"invalid literal for int() with base 10: 'asdf'\""
         )
         with pytest.raises(AssertionError, match="(?m)" + re.escape(expr)):
             with pytest.raises(ValueError, match=msg):
@@ -221,10 +221,7 @@ class TestRaises:
             with pytest.raises(AssertionError, match="'foo"):
                 raise AssertionError("'bar")
         (msg,) = excinfo.value.args
-        assert (
+        assert msg == '''Regex pattern did not match.\n Regex: "'foo"\n Input: "'bar"'''
-            msg
-            == '''Regex pattern did not match.\n Regex: "'foo"\n str(exception): "'bar"'''
-        )
 
     def test_match_failure_exact_string_message(self):
         message = "Oh here is a message with (42) numbers in parameters"
@@ -235,7 +232,7 @@ class TestRaises:
         assert msg == (
             "Regex pattern did not match.\n"
             " Regex: 'Oh here is a message with (42) numbers in parameters'\n"
-            " str(exception): 'Oh here is a message with (42) numbers in parameters'\n"
+            " Input: 'Oh here is a message with (42) numbers in parameters'\n"
             " Did you mean to `re.escape()` the regex?"
         )