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run code in 150+ php & hhvm versions
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<?php $subject = "[#1234] Subject"; $pattern = '/^\[\#([0-9]+)/'; preg_match($pattern, $subject, $matches); print_r($matches);
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => [#1234 [1] => 1234 )