Remove the xmllib module that was obsolete.
diff --git a/Doc/howto/regex.tex b/Doc/howto/regex.tex
index 62b6daf..d911be6 100644
--- a/Doc/howto/regex.tex
+++ b/Doc/howto/regex.tex
@@ -522,8 +522,7 @@
contains a lot of regular expressions, or re-uses the same ones in
several locations, then it might be worthwhile to collect all the
definitions in one place, in a section of code that compiles all the
-REs ahead of time. To take an example from the standard library,
-here's an extract from \file{xmllib.py}:
+REs ahead of time. To take an example from the standard library:
\begin{verbatim}
ref = re.compile( ... )