What are the potential pitfalls of using regex to parse XML structures in PHP?

Using regex to parse XML structures in PHP can be error-prone and inefficient because XML is a complex and hierarchical data format that regex may not be well-suited to handle. It is recommended to use PHP's built-in XML parsing functions like SimpleXML or DOMDocument, which are specifically designed for working with XML data and provide a more reliable and robust solution.

// Example of parsing XML using SimpleXML
$xmlString = '<data><item>Item 1</item><item>Item 2</item></data>';
$xml = simplexml_load_string($xmlString);

foreach ($xml->item as $item) {
    echo $item . "\n";
}