What is the recommended approach for using regular expressions in PHP to search for specific patterns in a string?

When using regular expressions in PHP to search for specific patterns in a string, the recommended approach is to use the preg_match() function. This function allows you to specify the pattern you want to search for and the string you want to search within. If a match is found, preg_match() will return true, otherwise it will return false.

// Example of using preg_match() to search for a specific pattern in a string
$string = "The quick brown fox jumps over the lazy dog";
$pattern = "/brown/";

if (preg_match($pattern, $string)) {
    echo "Pattern found in the string.";
} else {
    echo "Pattern not found in the string.";
}