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
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CategoryBoost CategoryCpp CategoryCppTemplates CategoryRegularExpressions