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

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Appendix 2: Not Yet Implemented

The following features are planned for xpressive 2.X:

syntax_option_type::collate
Collation sequences such as [.a.]
Equivalence classes like [=a=]
Control of nested results generation with syntax_option_type::nosubs, and a nosubs() modifier for static xpressive.

Here are some wish-list features. You or your company should consider hiring me to implement them!

Optimized DFA back-end for simple, fast regexing.
Different regex compiler front ends for basic, extended, awk, grep and egrep regex syntax.
Fine-grained control over the dynamic regex syntax
Optional integration with ICU for full Unicode support.
Improved localization support, possibly as a custom facet for std::locale.