This is a snippet that finds e-mail addresses from a string using a regexp and converts them into clickable links.

<?php
function convert_emails_to_clickable_links($text)
{
$regex = "([a-z0-9_\-\.]+)". # name

"@". # at

"([a-z0-9-]{1,64})". # domain

"\.". # period

"([a-z]{2,10})"; # domain extension 

$text = eregi_replace($regex, '<a href="mailto:\\1@\\2.\\3">\\1@\\2.\\3</a>', $text);

return $text;
}

$text = 'You can contact me at: example-name@mysite.com. My alternative address is other-username@domain.com.';

echo convert_emails_to_clickable_links($text);

/*
You can contact me at: <a href="mailto:example-name@mysite.com">example-name@mysite.com</a>. My alternative address is <a href="mailto:other-username@domain.com">other-username@domain.com</a>.
?>
*/

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