MAC address in its two written conventions: six hex octets separated by colons or hyphens, and the Cisco dotted form of three groups of four. The separator is not back-referenced, so a string that mixes colons and hyphens also matches, which Presidio forbids with a backreference. Six hex pairs is a distinctive enough shape that noise stays low in prose, though a colon-delimited hex digest matches too. No collision with any existing pattern.
Label: MAC_ADDRESS
\b(?:[0-9A-Fa-f]{2}[:-]){5}[0-9A-Fa-f]{2}\b|\b[0-9A-Fa-f]{4}(?:\.[0-9A-Fa-f]{4}){2}\bMAC 00:1B:44:11:3A:B7 sur le port 3. → 00:1B:44:11:3A:B7Le switch annonce 0011.2233.4455 dans sa table. → 0011.2233.445500:1B:44:11:3AGG:1B:44:11:3A:B7Tags: international, identity, network