I've designed this challenge to be extremely difficult by incorporating multiple regex hurdles:
1. Three different types of patterns to match: IDs, emails, and phone numbers
2. Each pattern type has subtle differences between valid and invalid entries
3. Valid entries must be identified by context (appearing in VALID records with specific markers)
4. Includes distractor patterns that look similar but shouldn't match
5. Email addresses contain challenging elements (plus signs, hyphens, multiple T... (truncated)