ONIG_SYN_ALLOW_INTERVAL_LOW_ABBREV   54 regparse.c           ONIG_SYN_ALLOW_INTERVAL_LOW_ABBREV |
ONIG_SYN_ALLOW_INTERVAL_LOW_ABBREV 2347 regparse.c         if (IS_SYNTAX_BV(env->syntax, ONIG_SYN_ALLOW_INTERVAL_LOW_ABBREV)) {