- Regex:
    - find_iter -> FindMatches
    - captures_iter -> FindCaptures
    - split -> RegexSplits
    - splitn -> RegexSplitsN
    - replace
    - replace_all
    - replacen
    - capture_names -> CaptureNames
    - captures_len

- Captures:
    - name
    - iter_named -> SubCapturesNamed

ll:
    - onig_name_to_group_numbers
    - onig_name_to_backref_number
    -
    -

    - onig_get_encoding
    - onig_get_options
    - onig_get_case_fold_flag
    - onig_get_syntax

    - onig_foreach_name (???)
    - onig_capture_tree_traverse (???)


- int onig_new_without_alloc(regex_t* reg, const UChar* pattern,
- int onig_new_deluxe(regex_t** reg, const UChar* pattern, const UChar* pattern_end,
- void onig_free_body(regex_t* reg)
- void onig_region_copy(OnigRegion* to, OnigRegion* from)
- int onig_region_resize(OnigRegion* region, int n)
- int onig_capture_tree_traverse(OnigRegion* region, int at,
- int onig_noname_group_capture_is_active(regex_t* reg)

- void onig_copy_encoding(OnigEncoding to, OnigOnigEncoding from)
- int onig_set_meta_char(OnigSyntaxType* syntax, unsigned int what,
- OnigCaseFoldType onig_get_default_case_fold_flag()
- int onig_set_default_case_fold_flag(OnigCaseFoldType case_fold_flag)
- unsigned int onig_get_match_stack_limit_size(void)
- int onig_set_match_stack_limit_size(unsigned int size)
- const char* onig_version(void)

BAD:
- void onig_set_warn_func(OnigWarnFunc func)
- void onig_set_verb_warn_func(OnigWarnFunc func)
- int onig_init(void)
- int onig_end(void)
- int onig_set_default_syntax(OnigSyntaxType* syntax)

- UChar* onigenc_get_prev_char_head(OnigEncoding enc, const UChar* start, const UChar* s)
- UChar* onigenc_get_left_adjust_char_head(OnigEncoding enc,
- UChar* onigenc_get_right_adjust_char_head(OnigEncoding enc,
- int onigenc_strlen(OnigEncoding enc, const UChar* s, const UChar* end)
- int onigenc_strlen_null(OnigEncoding enc, const UChar* s)
- int onigenc_str_bytelen_null(OnigEncoding enc, const UChar* s)