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run code in 150+ php & hhvm versions
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<?php // Positive numbers: echo preg_replace("/^(ela4|lva1).*\.prod$/","","ela4-db10.prod,lva1-db100.prod"); ?>
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0