How can the use of \s, \n, or \r\n affect the matching of line breaks in PHP regular expressions?

When using regular expressions in PHP to match line breaks, the use of \s will match any whitespace character including spaces, tabs, and line breaks. However, if you specifically want to match only line breaks, you should use \n for Unix-style line breaks or \r\n for Windows-style line breaks. This ensures that your regular expression accurately matches line breaks in the text.

// Example code snippet to match line breaks using \n for Unix-style line breaks
$text = "Hello\nWorld";
$pattern = "/\n/";
if (preg_match($pattern, $text)) {
    echo "Line break found!";
} else {
    echo "No line break found.";
}