jeff@mycom.com (including the "a" tags)

show code

<?php 

$html = '<a href="mailto:jeff@mycom.com">Mailme</a> (including the "a" tags)';
$html = preg_replace("~<a .*?href=[\'|\"]mailto:(.*?)[\'|\"].*?\>.*?</a>~", "$1", $html);
echo $html;