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@ 2014-04-22T12:05:06Z

<?php
preg_match('/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/', $str, $link);
if (empty($link[0])) {
    echo "Nothing found!";
} else {
    echo $link[0];
}

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

34.88 ms | 402 KiB | 5 Q