test_ok2/changelog/5914.feature.rst

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``pytester`` learned two new functions, `no_fnmatch_line <https://docs.pytest.org/en/latest/reference.html#_pytest.pytester.LineMatcher.no_fnmatch_line>`_ and
`no_re_match_line <https://docs.pytest.org/en/latest/reference.html#_pytest.pytester.LineMatcher.no_re_match_line>`_.
The functions are used to ensure the captured text *does not* match the given
pattern.
The previous idiom was to use ``re.match``:
.. code-block:: python
assert re.match(pat, result.stdout.str()) is None
Or the ``in`` operator:
.. code-block:: python
assert text in result.stdout.str()
But the new functions produce best output on failure.