What are the advantages and disadvantages of using str_replace versus regular expressions for text replacement in PHP scripts?

When replacing text in PHP scripts, both `str_replace` and regular expressions can be used. `str_replace` is simpler and faster for basic text replacement, while regular expressions offer more powerful pattern matching capabilities. The choice between the two methods depends on the complexity of the text replacement needed.

// Using str_replace for simple text replacement
$text = "Hello, World!";
$new_text = str_replace("Hello", "Goodbye", $text);
echo $new_text;

// Using regular expressions for more complex pattern matching
$text = "The quick brown fox jumps over the lazy dog.";
$new_text = preg_replace("/\b[a-zA-Z]{4}\b/", "****", $text);
echo $new_text;