ONIG_SYN_OP_ESC_PLUS_ONE_INF 3405 regparse.c           if (! IS_SYNTAX_OP(syn, ONIG_SYN_OP_ESC_PLUS_ONE_INF)) break;
ONIG_SYN_OP_ESC_PLUS_ONE_INF  112 regsyntax.c        ONIG_SYN_OP_ASTERISK_ZERO_INF | ONIG_SYN_OP_ESC_PLUS_ONE_INF |