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Case-insensitive pattern matching lines that start with 'yahoo.co' or 'yahoo.com', followed by any characters as long as no dot-plus-two-letters (a country-code TLD like .uk or .jp) appears, optionally ending with '.co' or '.com'. The tempered token blocks country-code suffixes, so it accepts yahoo.com but rejects variants like yahoo.co.uk. Typically used for domain/URL filtering or validation of Yahoo web addresses.