On 13/03/2023 12:00, Boris Kolpackov via Boost wrote:

A quick note on our experience reducing dependency on Boost.Regex (and thus ICU) in build2 packages for Boost 1.81.0.

Can I just point out that regex is now header only, and thus the dependency is only there if it's actually used, likewise ICU is not required to be present at build time, but only if boost/regex/icu.hpp is actually used. [technically, I haven't yet removed the old C++98 code which does have a dependency on ICU, but it will be going very soon]. John.