MATCH_ARG_INIT   3100 regexec.c        MATCH_ARG_INIT(msa, option, region, at);
MATCH_ARG_INIT   3569 regexec.c            MATCH_ARG_INIT(msa, option, region, start);
MATCH_ARG_INIT   3585 regexec.c        MATCH_ARG_INIT(msa, option, region, orig_start);