Add regex and regsub to the list of undocumented obsolete modules.

Doc/lib/libundoc.tex

@@ -147,6 +147,18 @@ now just as good).
 \item[\module{poly}]
 --- Polynomials.
 
+\item[\module{regex}]
+--- Emacs-style regular expression support; may still be used in some
+old code (extension module).  Refer to the
+\citetitle[http://www.python.org/doc/1.6/lib/module-regex.html]{Python
+1.6 Documentation} for documentation.
+
+\item[\module{regsub}]
+--- Regular expression based string replacement utilities, for use
+with \module{regex} (extension module).  Refer to the
+\citetitle[http://www.python.org/doc/1.6/lib/module-regsub.html]{Python
+1.6 Documentation} for documentation.
+
 \item[\module{tb}]
 --- Print tracebacks, with a dump of local variables (use
 \function{pdb.pm()} or \refmodule{traceback} instead).