[a-z\-_]+\s*\=\s*[\'\"](.*?)[\'\"].*?\s*))+.*?>'; public function __construct( string $name = self::NAME, string $pattern = self::PATTERN, array $groupByName = [], bool $replaceAllAttrs = false, string $baseAlgorithm = '' ) { parent::__construct($name, $pattern, $groupByName, $replaceAllAttrs, $baseAlgorithm); $this->updatePatternAndGroup($pattern); } /** * Must implement logic of supported 3rd-party attributes retrieving */ abstract protected function retrieveImgAttributes(): array; /** * Additional processing for 3rd party attributes support compatibility on img tag replace pattern * need to re-configure pattern and group by name */ private function updatePatternAndGroup(string $pattern) { $imgAttributes = $this->retrieveImgAttributes(); $imgAttributes[] = 'src'; // the src group will be last each time $groupsByName = []; $imgAttributesRegexp = ''; $groupNumber = 0; foreach ($imgAttributes as $index => $imgAttribute) { $groupName = str_replace('-', '_', $imgAttribute); $groupNumber += 2; $imgAttributesRegexp .= ($index ? '|' : '') . '(?<' . $groupName . '>' . $imgAttribute . '\s*\=\s*[\'\"](.*?)[\'\"].*?\s*)'; $groupsByName[$groupName] = $groupNumber; } $pattern = str_replace('%img_attributes%', $imgAttributesRegexp, $pattern); $this->pattern = $pattern; $this->groupByName = $groupsByName; } }