A detailed description of the bug introduced in Python 2.3 is 
here:

http://sourceforge.net/tracker/index.php?
func=detail&aid=798274&group_id=5470&atid=105470

This patch implements the solution as suggested in the 
report: if a testdir argument is provided and the test 
module is not in a package, it attempts to import modules 
from that directory. This restores compatibility with the test 
suites I wrote in Python 2.2, and does not interfere with 
the current behavior as used by the Python regression test 
suite.

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Sorry, I'm not familiar with Python patch policies, but it seems a 
second 2.3.x release is about to be released without this patch 
included.  This makes it difficult for users of the test suite I wrote 
to use it, because they have to replace their version of 
regrtest.py with mine, or go back to Python 2.2.  Is there 
anything else I need to do in order to get this version 
incorporated?

Thanks.

regrtest's purpose is to test Python; third-party projects wishing to use regrtest in their own test suites would do well to customize it for their particular needs.