URL replace with link (includes period and space)

<?php

$s = 'Please visit http://google.com. Then return to our site.';
$r = preg_replace('"<a[^>]+>.+?</a>(*SKIP)(*FAIL)|\b(?:https?)://\S+"', '<a href="$0">$0</a>', $s);

echo $r;

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URL replace with link (includes period and space)

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