Perl-совместимые регулярные выражения (Perl-compatible regular expressions)
UNSUPPORTED OPTIONS AND PATTERN ITEMS
The only pcre_exec() options that are supported for JIT execution
are PCRE_NO_UTF8_CHECK, PCRE_NO_UTF16_CHECK, PCRE_NO_UTF32_CHECK,
PCRE_NOTBOL, PCRE_NOTEOL, PCRE_NOTEMPTY, PCRE_NOTEMPTY_ATSTART,
PCRE_PARTIAL_HARD, and PCRE_PARTIAL_SOFT.
The only unsupported pattern items are \C (match a single data
unit) when running in a UTF mode, and a callout immediately
before an assertion condition in a conditional group.
