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<?php preg_match('#^((http:|https:)?//(.+\.)?klm\.com|/[^/]).*$#sU', 'http://klm.com/smth', $m); var_dump($m); preg_match('#^((http:|https:)?//(.+\.)?klm\.com|/[^/]).*$#sU', '/RU/ru/local/air-france/monde/index.htm', $m); var_dump($m);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(3) { [0]=> string(19) "http://klm.com/smth" [1]=> string(14) "http://klm.com" [2]=> string(5) "http:" } array(2) { [0]=> string(39) "/RU/ru/local/air-france/monde/index.htm" [1]=> string(2) "/R" }

preferences:
191.3 ms | 406 KiB | 322 Q