re is standard, not built-in.

Doc/lib/libre.tex

-\section{Built-in Module \module{re}}
-\declaremodule{builtin}{re}
+\section{Standard Module \module{re}}
+\declaremodule{standard}{re}
+\moduleauthor{Andrew M. Kuchling}{akuchling@acm.org}
+\sectionauthor{Andrew M. Kuchling}{akuchling@acm.org}
 
 
-\modulesynopsis{New Perl-style regular expression search and match operations.}
+\modulesynopsis{New Perl-style regular expression search and match
+operations.}
 
 
 This module provides regular expression matching operations similar to

Doc/lib/libstdtypes.tex

@@ -435,7 +435,7 @@ require a sequential parameter list).
 Additional string operations are defined in standard module
 \module{string} and in built-in module \module{re}.
 \refstmodindex{string}
-\refbimodindex{re}
+\refstmodindex{re}
 
 \subsubsection{Mutable Sequence Types}