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run code in 200+ php & hhvm versions
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<?php preg_match('/_(\d{6})\.txt/', 'foo_123456.txt', $matches); var_dump($matches);
Output for 4.3.0 - 7.2.0
array(2) { [0]=> string(11) "_123456.txt" [1]=> string(6) "123456" }