I've uploaded to the Boost Vault a new version of xpressive. This should be the version that ultimately becomes part of Boost 1.36. If anybody find problems, pls. let me know. New Features: * skip(), for specifying which parts of the input sequence to ignore when matching it against a regex. http://tinyurl.com/5xndnk (<http://boost-sandbox.sourceforge.net/libs/xpressive/doc/html/boost/xpressive/skip.html>) * regex_replace() accepts formatter objects and formatter expressions, in addition to format strings. http://tinyurl.com/4c8rt4 (<http://boost-sandbox.sourceforge.net/libs/xpressive/doc/html/boost_xpressive/user_s_guide/string_substitutions.html#boost_xpressive.user_s_guide.string_substitutions.formatter_objects>) * Range-based regex_replace() algorithm. http://tinyurl.com/4awtoh (<http://boost-sandbox.sourceforge.net/libs/xpressive/doc/html/boost/xpressive/regex_replace.html>) Bugs Fixed: * Crash when semantic actions are placed in look-aheads, look-behinds or independent sub-expressions. Thanks, -- Eric Niebler BoostPro Computing http://www.boostpro.com