<p>hello <a href="https://github.com/tivie">@tivie</a> how are you?</p> <p>this email foo@gmail.com is not parsed</p> <p>this @mentions is not parsed</p> <p><a href="https://github.com/john.doe">@john.doe</a></p> <p><a href="https://github.com/john-doe">@john-doe</a></p> <p>@.johndoe</p> <p>@_johndoe</p> <p>@-johndoe</p> <p><a href="https://github.com/johndoe">@johndoe</a>.</p> <p><a href="https://github.com/johndoe">@johndoe</a>-</p>