Fix lots of broken links in the docs, found by Sphinx' external link checker.
diff --git a/Doc/howto/regex.rst b/Doc/howto/regex.rst
index 2cd83d4..2f085e5 100644
--- a/Doc/howto/regex.rst
+++ b/Doc/howto/regex.rst
@@ -367,8 +367,8 @@
Python distribution. It allows you to enter REs and strings, and displays
whether the RE matches or fails. :file:`redemo.py` can be quite useful when
trying to debug a complicated RE. Phil Schwartz's `Kodos
-<http://www.phil-schwartz.com/kodos.spy>`_ is also an interactive tool for
-developing and testing RE patterns.
+<http://kodos.sourceforge.net/>`_ is also an interactive tool for developing and
+testing RE patterns.
This HOWTO uses the standard Python interpreter for its examples. First, run the
Python interpreter, import the :mod:`re` module, and compile a RE::