What are the potential drawbacks of using regular expressions for basic string matching in PHP?

Using regular expressions for basic string matching in PHP can be overkill and may lead to slower performance compared to simpler string functions like strpos(). Additionally, regular expressions can be difficult to read and maintain, especially for those unfamiliar with the syntax. To solve this issue, consider using simpler string functions when possible to improve performance and readability of your code.

// Using strpos() for basic string matching instead of regular expressions
$string = "Hello, world!";
$substring = "Hello";

if (strpos($string, $substring) !== false) {
    echo "Substring found in string.";
} else {
    echo "Substring not found in string.";
}