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getstring() of the _sre module contains the following code:
-------------
 ...
 buffer = Py_TYPE(string)->tp_as_buffer;
 if (!buffer || !buffer->bf_getbuffer ||
 (*buffer->bf_getbuffer)(string, &view, PyBUF_SIMPLE) < 0) {
 PyErr_SetString(PyExc_TypeError, "expected string or buffer");
 return NULL;
 }
 /* determine buffer size */
 bytes = view.len;
 ptr = view.buf;
 /* Release the buffer immediately --- possibly dangerous
 but doing something else would require some re-factoring
 */
 PyBuffer_Release(&view);
 ...
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getstring() is used to initialize a state or a pattern. State and pattern have destructors (pattern_dealloc() and state_fini()), so it should be possible to keep the view active and call PyBuffer_Release() in the destructor.