Free
https://email-checker.net/email-extractor
Email Extractor is a simple little tool that will help you find email addresses hidden in a content. Just copy the entire block of text and paste it in the above input box. All you have to do is click on the “Extract Email” button, it will find all the email addresses present in your input text. Any duplicate address will be ignored safely, as a final result, you get a unique list of all emails extracted.
Simple tool that does exactly what you need. Copy paste the code in and the emails are extracted! Clean and simple and best of all free!
https://debounce.io/extract-email-from-text/
DeBounce Email Extractor can easily clean out valuable email addresses from any content and compile all email addresses into one user-friendly list. Email Extractor online software is free all-in -one freeware. It is a powerful and lightweight tool designed to extract email addresses from different sources: local files, websites, search engines, etc.
Once extract is finished, you can export the emails as a .TXT file and import it to your sending software. Moreover, you may validate extracted emails prior to sending campaigns. Validation is highly recommended because you will get rid of invalid and bad emails and you can save your email sending reputation.