```php\s+)(?[^```]+\n)(?(\s+)?```)#ms'; /** * @see https://regex101.com/r/SZr0X5/12 * @var string */ public const HERENOWDOC_SNIPPET_REGEX = '#(?<<<(\'?([A-Z]+)\'?|\"?([A-Z]+)\"?)\s+)(?[^\3|\4]+)(?(\s+)?\3|\4)#msU'; }