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run code in 200+ php & hhvm versions
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<?php $haystack = array( 'Part1', 'Part2', 'Part3', 'Part4' ); $matches = preg_grep('/(?!Part)\d/', $haystack); print_r($matches);
based on GDqkH
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0alpha1
Array ( [0] => Part1 [1] => Part2 [2] => Part3 [3] => Part4 )