PHP Get unsubscribe URL from email body

Question

I have an email's HTML body. I need to parse just the unsubscribe link from that. So if at any point in the dom there is some kind of link, containing the word Unsubscribe, I would need to return the URL of that specific link. I tried different regex but I can't seem to find just the unsubscribe URL or sometimes at all.

$regexp = "<a\s[^>]*href=(\"??)([^\" >]*?)\\1[^>]*>(.*(?:unsubscribe).*)<\/a>";
preg_match_all("/$regexp/iU", $body, $matches);
var_dump($matches);

This does not work :/

Thanks

Answer 1

You can use DOMXpath and check if the anchor contains a case insensitive match for unsubscribe and get the url using getAttribute to get the value for the href.

$data = <<<DATA
This is a link <a href="https://stackoverflow.com/">SO</a> and this is <a href="http://test.test">unsubscribe</a> and 
another and this is <a href="http://test.test">UnSubScribe</a>.
DATA;

$dom = new DomDocument();
$dom->loadHTML($data);
$xpath = new DOMXPath($dom);
$query = "//a[contains(translate(., 'UNSUBSCRIBE', 'unsubscribe'),'unsubscribe')]";
$anchors = $xpath->query($query);

foreach ($anchors as $a) {
    echo sprintf("%s: %s" . PHP_EOL,
        $a->nodeValue,
        $a->getAttribute("href")
    );
}

Output

unsubscribe: http://test.test
UnSubScribe: http://test.test

See a PHP demo.