What are the potential pitfalls of using preg_replace() to replace text blocks in PHP?

Using preg_replace() to replace text blocks in PHP can lead to potential pitfalls such as unintended replacements due to regex patterns matching more than intended, performance issues with complex regex patterns, and security vulnerabilities if user input is not properly sanitized. To avoid these pitfalls, consider using a more targeted approach with specific string manipulation functions or libraries designed for text replacement tasks.

// Example of using str_replace() for simple text replacement
$text = "Hello, World!";
$newText = str_replace("Hello", "Hi", $text);
echo $newText;