john.doe@example.com,jane@smith-family.net,support@company.co.uk,info@subdomain.example.org The text contains 6 email addresses: 1. john.doe@example.com 2. jane@smith-family.net 3. support@company.co.uk 4. info@subdomain.example.org 5. not.an.email.com (invalid, missing top-level domain) 6. @missing-username.com (invalid, missing username) Valid email addresses are separated by commas without spaces. Invalid addresses are not included in the list. The pattern to validate an email is: [username]@[domain] Where: - username can contain letters, numbers and some special characters like period, underscore or hyphen - domain has at least two parts separated by a period: [subdomain].[top-level-domain] Top-level domains can have 2-6 characters long This matches the email address format defined in the RFC 5322 standard. In this specific case, the 4 provided addresses match the pattern and are included in the final list, while the 2 invalid ones are not.