In what scenarios would it be advisable to avoid using regular expressions for text parsing in PHP?

Regular expressions can be inefficient and hard to maintain for complex text parsing tasks. In scenarios where the text patterns are simple and straightforward, using regular expressions is fine. However, for more complex parsing tasks or when performance is a concern, it may be advisable to use built-in PHP functions like `strpos()`, `substr()`, or `explode()` for text parsing.

// Example of using strpos() to parse text instead of regular expressions
$text = "Hello, world!";
$pos = strpos($text, ",");
if ($pos !== false) {
    $beforeComma = substr($text, 0, $pos);
    $afterComma = substr($text, $pos + 1);
    echo $beforeComma; // Output: Hello
    echo $afterComma; // Output: world!
}