 // 指定第N个ipv6地址
      const ipv6IndexMatch = $ipv6Reg.value.match(/^@(\d+)$/);
      if (ipv6IndexMatch) {
        const idx = parseInt(ipv6IndexMatch[1]) - 1;
        if (idx < 0 || idx >= curIpv6s.length) {
          ipv6RegTooltip.show({
            title: i18n({
              "en": "<span style='color: red'>Index out of range</span>",
              "zh-cn": "<span style='color: red'>索引超出范围</span>",
            }),
            html: true,
            placement: "top",
          })