ONIG_OPTION_NOTEOL  350 include/ruby/oniguruma.h #define ONIG_OPTION_POSIX_REGION         (ONIG_OPTION_NOTEOL << 1)
ONIG_OPTION_NOTEOL  325 regint.h       #define IS_NOTEOL(option)         ((option) & ONIG_OPTION_NOTEOL)