...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards
...one of the most highly regarded and expertly designed C++ library projects in the world.
boost::xpressive::eol — End of line assertion.
unspecified eol;
'eol' matches the zero-width sub-sequence immediately preceeding a logical newline sequence. The regex traits is used to determine what constitutes a logical newline sequence.