In what scenarios would using preg_match be more appropriate than strpos or strstr functions in PHP?

Using preg_match is more appropriate than strpos or strstr functions in PHP when you need to perform more complex pattern matching using regular expressions. preg_match allows you to search for patterns within a string using regular expressions, giving you more flexibility and control over the matching process compared to strpos or strstr.

// Example of using preg_match to search for a specific pattern within a string
$string = "Hello, World!";
$pattern = "/^Hello/";
if (preg_match($pattern, $string)) {
    echo "Pattern found in the string.";
} else {
    echo "Pattern not found in the string.";
}