On 2023/03/13 14:07, Andrey Semashev via Boost wrote:

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.

However Boost.Log also depends on Boost.Spirit which depends on Boost.Regex so that's a hard dependency.