{"text": "Challenge Set A:\nIn the realm of cryptic communications, one may encounter emails such as alice.smith+promo@agency.co.uk, john_doe.42@example-domain.com, not_to_be_matched.email@fail..com and variations that look similar but are invalid (e.g., alice.smithpromo@agency.co.uk missing the plus).\n\nFor contact numbers, valid formats include +1 (800) 555-0199 and 800-555-0199; note that 1800-555-0199, while similar, is not acceptable.\n\nDates appear in various international styles: 2021-12-31, 31/12/2021, and 2021.12.31 are correct, whereas 2021/12/31 or 31-12-2021 should be excluded.\n\nDigital records also contain properly tagged entries like <file>XYZ-2023</file> (with matching case), while variants such as <file>XYZ-2023</FILE> are invalid.\n\nMonetary figures are recorded as $2,345.67 and €12.345,67; variants like $2345.67 or €12,345.67 do not follow the strict formatting rules.\n\nSecurity codes such as #Sec-456B are critical and must match exactly (note that #sec-456b or #Sec-456X are not acceptable due to case and character errors).\n\nFinally, license plate formats require symmetry: AB-123-AB is valid, but AB-123-BA is not.\n\nThe task is to create one regex that precisely matches only the valid patterns provided above.", "targetItems": ["alice.smith+promo@agency.co.uk", "john_doe.42@example-domain.com", "+1 (800) 555-0199", "800-555-0199", "2021-12-31", "31/12/2021", "2021.12.31", "<file>XYZ-2023</file>", "$2,345.67", "€12.345,67", "#Sec-456B", "AB-123-AB"]}