Convert external links to internal links. Fixes #2010.
diff --git a/Doc/library/re.rst b/Doc/library/re.rst
index dd22835..5fd3dd5 100644
--- a/Doc/library/re.rst
+++ b/Doc/library/re.rst
@@ -65,8 +65,7 @@
above, or almost any textbook about compiler construction.
A brief explanation of the format of regular expressions follows. For further
-information and a gentler presentation, consult the Regular Expression HOWTO,
-accessible from http://www.python.org/doc/howto/.
+information and a gentler presentation, consult the :ref:`regex-howto`.
Regular expressions can contain both special and ordinary characters. Most
ordinary characters, like ``'A'``, ``'a'``, or ``'0'``, are the simplest regular