Adjusted to use the new module synopsis support macros.
diff --git a/Doc/lib/libregex.tex b/Doc/lib/libregex.tex
index e3adf55..253d50b 100644
--- a/Doc/lib/libregex.tex
+++ b/Doc/lib/libregex.tex
@@ -1,6 +1,8 @@
 \section{Built-in Module \module{regex}}
-\label{module-regex}
-\bimodindex{regex}
+\declaremodule{builtin}{regex}
+
+\modulesynopsis{Regular expression search and match operations.}
+
 
 This module provides regular expression matching operations similar to
 those found in Emacs.