On 3/13/23 15:00, 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. Now only the following (leaf) libraries unconditionally depend on Boost.Regex:

* Boost.Convert * Boost.DLL * Boost.Log

Boost.Log can be configured to use std::regex or Boost.Xpressive as an alternative to Boost.Regex. https://www.boost.org/doc/libs/1_81_0/libs/log/doc/html/log/installation/con... Boost.Regex is the default because it provides the best performance. I'm not planning to change this.