--- boost/regex/user.hpp.orig	2010-01-31 01:14:34.000000000 +0100
+++ boost/regex/user.hpp	2010-01-31 01:14:48.000000000 +0100
@@ -84,7 +84,7 @@
 // define this if you want to be able to access extended capture
 // information in your sub_match's (caution this will slow things
 // down quite a bit).
-// #define BOOST_REGEX_MATCH_EXTRA
+#define BOOST_REGEX_MATCH_EXTRA
 
 // define this if you want to enable support for Unicode via ICU.
 // #define BOOST_HAS_ICU