What potential pitfalls should be considered when using preg_match_all() to extract content from a string in PHP?

When using preg_match_all() to extract content from a string in PHP, it's important to consider potential pitfalls such as incorrectly formatted regular expressions leading to unexpected results or performance issues when dealing with large strings. To avoid these pitfalls, make sure to thoroughly test your regular expression and consider using more efficient alternatives for large strings, such as strpos() or substr().

// Example of using preg_match_all() with proper error handling and performance considerations

$string = "The quick brown fox jumps over the lazy dog";
$pattern = "/quick (.*?) over/";
$matches = [];

if (preg_match_all($pattern, $string, $matches)) {
    // Process the extracted content from $matches
    print_r($matches);
} else {
    echo "No matches found.";
}