What potential issues could arise when using regular expressions to parse URLs in PHP?

One potential issue when using regular expressions to parse URLs in PHP is that the pattern may not be robust enough to handle all possible variations of URLs. To solve this, you can use PHP's built-in `parse_url()` function, which provides a more reliable way to parse URLs. This function breaks down a URL into its components such as scheme, host, path, etc., making it easier to work with.

$url = "https://www.example.com/path/to/page";

$url_components = parse_url($url);

echo "Scheme: " . $url_components['scheme'] . "\n";
echo "Host: " . $url_components['host'] . "\n";
echo "Path: " . $url_components['path'] . "\n";