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<?php // DO: Use PHP built-ins for common validation filter_var($email, FILTER_VALIDATE_EMAIL); filter_var($url, FILTER_VALIDATE_URL); filter_var($ip, FILTER_VALIDATE_IP); // DO: Name your capture groups $pattern = "/(?P<year>\d{4})-(?P<month>\d{2})/"; // DO: Compile reusable patterns as constants const EMAIL_PATTERN = "/^[^@\s]+@[^@\s]+\.[^@\s]+$/i"; // NEVER: Parse HTML with regex // preg_match("/<title>(.+)<\/title>/is", $html, $m); // fragile! // DO: Use DOMDocument for HTML parsing $dom = new DOMDocument(); @$dom->loadHTML($html); $titles = $dom->getElementsByTagName("title");
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