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$pattern = '/\d+/';

$subject = 'Hello 123 World';

if (preg_match($pattern, $subject, $matches))

{

    echo 'Match found: ' . $matches[0];

} else {

    echo 'No match found';

}

$pattern = '/\d+/';

$subject = 'Hello 123 World 456';

if (preg_match_all($pattern, $subject, $matches))

{

    echo 'Matches found: ' . implode(', ', $matches[0]);

} else {

    echo 'No matches found';

}

$pattern = '/\d+/';

$subject = 'Hello 123 World';

$replacement = '999';

$result = preg_replace($pattern, $replacement, $subject);

echo $result; // 輸出: Hello 999 World

$pattern = '/\s+/';

$subject = 'Hello World';

$result = preg_split($pattern, $subject);

print_r($result); // 輸出: Array ( [0] => Hello [1] => World )

$text = 'Hello. How are you?';

$search = '.';

$pattern = '/' . preg_quote($search, '/') . '/';

$result = preg_replace($pattern, '!', $text);

echo $result; // 輸出: Hello! How are you?