$ grep -E "78B-1t1c-ethip6[a-z0-9]+-[a-z0-9]*-ndrdisc" *
10ge2p1x520-ethip6lispip4-ip6base-ndrdisc.robot:| tc01-78B-1t1c-ethip6lispip4-ip6base-ndrdisc
$ grep -E "78B-1t1c-ethip6[a-z0-9]+-[a-z0-9]*-ndrdisc" *
10ge2p1x520-ethip6lispip4-ip6base-ndrdisc.robot:| tc01-78B-1t1c-ethip6lispip4-ip6base-ndrdisc