No support for POSIX character classes

[ju1ius]

Hi,
Parsing [[:alnum:]] results in Unexpected token "[" (class_) at line 1 and column 2.

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[Hywan]

Yes, POSIX character classes are not supported yet.

Documentation can be found at http://pcre.org/current/doc/html/pcre2pattern.html#SEC10.

Do you want to try a PR :-)?