re.c:862
VALUE
rb_reg_match_post(match)
    VALUE match;
{
    VALUE str;
    long pos;

    if (NIL_P(match)) return Qnil;
    if (RMATCH(match)->BEG(0) == -1) return Qnil;
    str = RMATCH(match)->str;
    pos = RMATCH(match)->END(0);
    str = rb_str_substr(str, pos, RSTRING(str)->len - pos);
    if (OBJ_TAINTED(match)) OBJ_TAINT(str);
    return str;
}
