I've created a regex pattern that uses alternation (|) to match exactly the 6 target items:

1. Email: "user\.name\+tag-email@sub\.domain-example\.com" - Escaping special characters like dots and plus sign
2. ISO date: "2023-07-15" - Simple date format that doesn't need escaping
3. UK date: "15\/07\/2023" - Escaping the forward slashes
4. Phone number: "\+44 20 7946 0958" - Escaping the plus sign and preserving spaces
5. Order code: "ORD-2023\/07\/15-A1B2C3" - Escaping the forward slashes
6. Serial number: "SN: 1A2B-3C4D-5E6F-7G8H" - Exact match including the "SN: " prefix

The pattern uses alternation to match exactly these strings and no others. I've carefully escaped special regex characters like dots, plus signs, and forward slashes to ensure they match literally.