Function regoptail

v2/engine/regexp.c:756–765

 */

static void
regoptail(
    char *p,
    char *val )
{
    /* "Operandless" and "op != BRANCH" are synonymous in practice. */
    if (p == NULL || p == &regdummy || OP(p) != BRANCH)
        return;
    regtail(OPERAND(p), val);
}

/*
 * regexec and friends