Fast compile-time regular expressions with support for
matching/searching/capturing during compile-time or runtime.


Features and support:
* Matching
* Searching (search or starts_with)
* Capturing content (named captures are supported too)
* Back-Reference (\g{N} syntax, and \1...\9 syntax too)
* Multiline support (with multi_) functions
* Unicode properties and UTF-8 support
