Run: 2026-04-24-01KQ00XY2J274KPP0A9F0Q9ZPB

To extract all valid email addresses from the given text and return them as a comma-separated list without spaces, we use a regular expression that matches standard email formats. The pattern `\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b` ensures: - **Username part**: Includes letters, digits, dots, underscores, %, +, and hyphens. - **Domain part**: Includes letters, digits, hyphens, and dots, ending with a TLD of at least two letters (e.g., `.com`, `.co.uk`). - **Word boundaries** (`\b`) prevent partial matches within words. Here's the step-by-step solution: ```python import re text = """Contact information: 1. John Doe - john.doe@example.com 2. Jane Smith - jane@smith-family.net 3. support@company.co.uk 4. info@subdomain.example.org 5. Invalid email: not.an.email.com 6. Another invalid: @missing-username.com""" pattern = r'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b' emails = re.findall(pattern, text) result = ",".join(emails) print(result) ``` **Output:** ``` john.doe@example.com,jane@smith-family.net,support@company.co.uk,info@subdomain.example.org ``` **Explanation:** - **Valid emails extracted**: - `john.doe@example.com` - `jane@smith-family.net` - `support@company.co.uk` - `info@subdomain.example.org` - **Invalid emails excluded**: - `not.an.email.com` (missing `@`). - `@missing-username.com` (empty username). The regex matches only valid emails, and the `join` method combines them into a comma-separated string without spaces.