What are the potential pitfalls of using ereg_replace in PHP for string manipulation tasks?

Using ereg_replace in PHP for string manipulation tasks is not recommended as it has been deprecated since PHP 5.3.0 and removed in PHP 7. Instead, it is recommended to use the preg_replace function which provides better performance and more robust regular expression support.

// Use preg_replace instead of ereg_replace for string manipulation tasks
$newString = preg_replace('/pattern/', 'replacement', $oldString);