ONIG_OPTION_POSIX_REGION  392 ext/mbstring/oniguruma/oniguruma.h #define ONIG_OPTION_MAXBIT               ONIG_OPTION_POSIX_REGION  /* limit */
ONIG_OPTION_POSIX_REGION  298 ext/mbstring/oniguruma/regint.h #define IS_POSIX_REGION(option)   ((option) & ONIG_OPTION_POSIX_REGION)
ONIG_OPTION_POSIX_REGION  174 ext/mbstring/oniguruma/regposix.c   options = ONIG_OPTION_POSIX_REGION;