$ grep -E "64B-1t1c-ethip4[a-z0-9]+-[a-z0-9]*-ndrdisc" *
10ge2p1x520-ethip4lispip4-ip4base-ndrpdrdisc.robot:| tc01-64B-1t1c-ethip4lispip4-ip4base-ndrdisc
$ grep -E "64B-1t1c-ethip4[a-z0-9]+-[a-z0-9]*-ndrdisc" *
10ge2p1x520-ethip4lispip4-ip4base-ndrpdrdisc.robot:| tc01-64B-1t1c-ethip4lispip4-ip4base-ndrdisc