Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2017. The current version is 1.89.0.
When using Unicode aware regular expressions
(with the u32regex type),
all the normal symbolic names for Unicode characters (those given in Unidata.txt)
are recognised. So for example:
[[.CYRILLIC CAPITAL LETTER I.]]
would match the Unicode character 0x0418.