- Retry-limit-in-match function enabled by default
- NEW: configure option --enable-posix-api=no (* enabled by default)
- NEW API: onig_search_with_param(), onig_match_with_param()
- NEW: Callouts of contents (?{...contents...}) (?{...}[X<>]) (?{{....}})
- NEW: Callouts of name (*name) (*name[tag]{args...})
- NEW: Builtin callouts (*FAIL) (*MISMATCH) (*ERROR{n}) (*COUNT) (*MAX{n}) etc..
(* Callout function API is experimental level and isn't fixed definitely yet. Undocumented now)