Boost Xpressive is an advanced, object-oriented RegularExpression template library for CeePlusPlus. It is one of the BoostLibraries. http://www.boost.org/doc/libs/1_50_0/doc/html/xpressive.html#boost_xpressive.preface It is used in some of the examples with BoostProtoLibrary ---- CategoryBoost CategoryCpp CategoryCppTemplates CategoryRegularExpressions