Compile Time Regular Expressions Versions Save

• fix of error with checked iterators in MSVC when ctre::split range return last item empty
• update cmake project version to mirror release version

• ability to build ctll::fixed_string from pointer and std::array (ctll::fixed_string<N>(ctll::construct_from_pointer, ptr))
• improved compatibility issues of operator== and operator!= utf8_iterator and utf8_sentinel

conditional [[msvc::flatten]] and explicit operator bool on capture groups, which fixes #275

• switching modes inside pattern (pattern: (?i)AB(?c)AB matches string: "abAB")
• better detection of char8_t support
• fix build failure in libc++ debug mode
• remove some shadowing warnings

Support for:

• lookbehind positive (<=abc) and negative (<!abc)
• case insensitive matching for ASCII only ctre::OPERATION<"regex", ctre::case_insensitive>(subject_or_range) (example: ctre::match<"[a-z]+", ctre::case_insensitive>(input)

Notes: don't use mixes case range when doing case_insensitive:

• [a-z] will match a-zA-Z
• [a-Z] won't match anything (as ascii(a) > ascii(Z))
• [A-z] will match more than you expect A-Z[\]^_a-z + backtick (as I don't know how to type in markdown correctly)

• [[:punct:]] behaves as ispunct in C
• fix for several MSVC warnings
• cmake library is using C++20 by default (you can change it back with -DCTRE_CXX_STANDARD=17)
• CI/CD for all supported compilers (+ some fixes along the way)

• updated to Unicode 14
• fix in UTF-16 support in patterns
• better support of C++17 modes on newer compilers

This release supports clang 12 properly.

• fix for negative unicode properties in ranges
• ctre::range now supports utf8 u8string iteration