Add regex and regsub to the list of undocumented obsolete modules.
diff --git a/Doc/lib/libundoc.tex b/Doc/lib/libundoc.tex
index 85152c4..f5abb21 100644
--- a/Doc/lib/libundoc.tex
+++ b/Doc/lib/libundoc.tex
@@ -147,6 +147,18 @@
\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).