To extract all valid email addresses from the given text, a regular expression can be used to match email patterns. Here's a regex pattern that can be used: ```regex [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}\b ``` The pattern matches email addresses that contain: 1. A username consisting of alphanumeric characters, dot (.), underscore (_), percent (%), plus (+), or hyphen (-) characters, followed by 2. An @ symbol, followed by 3. A domain name consisting of alphanumeric characters, dot (.) or hyphen (-), and 4. A top-level domain (TLD) that is at least two alphabetic characters long. The `\b` is a word boundary anchor that ensures the match ends with the TLD. Using this regex pattern, we can find the following valid email addresses in the provided text: * `john.doe@example.com` * `jane@smith-family.net` * `support@company.co.uk` * `info@subdomain.example.org` Returning these in a comma-separated list without spaces, we get: ``` john.doe@example.com,jane@smith-family.net,support@company.co.uk,info@subdomain.example.org ```