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run code in 200+ php & hhvm versions
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<?php echo preg_replace('/(?=.)/u', '!', 'آرد');
based on tSo9X
Output for 5.5.27 - 5.5.35, 5.6.11 - 7.2.0
!آ!ر!د
Output for 5.3.18 - 5.5.26, 5.6.7 - 5.6.10
!�!�!�!�!�!�