Match only the email addresses in the following text.

@Larry_Page: You can contact me at mark.zuckerberg@facebook.com or m_zuckerberg@gmail.com


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A possible solution is [a-z._]+@[a-z.]+. Please note that this matches more than just email addresses, and it doesn't fit all possible email addresses, but it fits for this example.
Your matches are:

Created by Ruud Jansen.