boost::text::word_property
// In header: <boost/text/word_break.hpp> enum word_property { Other, CR, LF, Newline, Katakana, ALetter, MidLetter, MidNum, MidNumLet, Numeric, ExtendNumLet, Regional_Indicator, Hebrew_Letter, Double_Quote, Single_Quote, ExtPict, WSegSpace, Format, Extend, ZWJ };