The PCRE2 package implements a low-level API for accessing the PCRE libraries (8, 16, and 32-bit)
It was intended to replace Base.PCRE which was not threadsafe, as well as missing non-UTF-8 support.
Base.PCRE still only supports UTF-8, which is why this is needed for the Strs package.
It is my intention to change this to use the libraries now created by the BinaryBuilder.
As a backup, if it can't get the libraries from BinaryBuilder, it will look for the libpcre2 libraries in /usr/local/lib (on MacOS and Linux), so a "brew install pcre2" should work to get those installed correctly.