Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Global s0

boost::xpressive::s0 — Sub-match placeholder, like $& in Perl.

Synopsis

// In header: <boost/xpressive/regex_primitives.hpp>

mark_tag const s0;