This challenge includes valid and invalid emails with tricky subdomains and plus aliases, phone numbers with various international formats that can trip up naive matching, multiple date formats with potential pitfalls, and employee ID patterns that require capturing and backreferences. Advanced regex techniques, including lookaheads/lookbehinds, escaping special characters, careful alternation, and validation logic for each data type, will be needed to accurately match only the valid items liste... (truncated)