This pattern uses alternation to match different formats:
1. User IDs: #[A-Z]{2}-\d[0-9A-Z]-[A-Z]{2} matches the valid user IDs
2. IPv6: Multiple patterns separated with | to match all three valid IPv6 formats
3. Currency: (C\$750\.00|£1,250\.75) for the exact currency amounts
4. Dates: (2023/04/15|15-04-2022|2022\.04\.15) for the exact date formats
5. Email: support@example\.com for the specific email
6. Reward codes: R-\d{2}-[A-Z]{2}-[0-9A-Z]{3} for the reward code format

Each component is carefully crafted to match only the valid items and not match invalid ones.