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<?php $sites = array( 'site.ru', 'www.site.ru', 'en.site.ru', 'www.en.site.ru', 'de.site.ru', 'www.de.site.ru', ); foreach($sites as $site) { preg_match_all('/^(?:www\.)?(en|de)?(.*)/i', $site, $matches); var_dump($matches); }
Output for 5.6.0 - 5.6.27, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
array(3) { [0]=> array(1) { [0]=> string(7) "site.ru" } [1]=> array(1) { [0]=> string(0) "" } [2]=> array(1) { [0]=> string(7) "site.ru" } } array(3) { [0]=> array(1) { [0]=> string(11) "www.site.ru" } [1]=> array(1) { [0]=> string(0) "" } [2]=> array(1) { [0]=> string(7) "site.ru" } } array(3) { [0]=> array(1) { [0]=> string(10) "en.site.ru" } [1]=> array(1) { [0]=> string(2) "en" } [2]=> array(1) { [0]=> string(8) ".site.ru" } } array(3) { [0]=> array(1) { [0]=> string(14) "www.en.site.ru" } [1]=> array(1) { [0]=> string(2) "en" } [2]=> array(1) { [0]=> string(8) ".site.ru" } } array(3) { [0]=> array(1) { [0]=> string(10) "de.site.ru" } [1]=> array(1) { [0]=> string(2) "de" } [2]=> array(1) { [0]=> string(8) ".site.ru" } } array(3) { [0]=> array(1) { [0]=> string(14) "www.de.site.ru" } [1]=> array(1) { [0]=> string(2) "de" } [2]=> array(1) { [0]=> string(8) ".site.ru" } }

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