regex: boost::xpressive vs boost::regex

Question

I wanted to do some regular expressions in C++ so I looked on the interwebz (yes, I am an beginner/intermediate with C++) and found this SO answer.

I really don\'t know

Answer 1

One fairly important difference is that Boost Regex can support linking to ICU for Unicode support (character classes, etc) Boost Regex ICU Support.

As far as I can tell, Boost Xpressive doesn't have this kind of support built-in.