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run code in 150+ php & hhvm versions
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<?php var_dump (preg_split ('~|й~u', 'р'));
Output for 5.0.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(0) "" [1]=> string(2) "р" [2]=> string(0) "" }
Output for 4.3.5 - 4.4.9
array(2) { [0]=> string(0) "" [1]=> string(2) "р" }
Output for 4.3.0 - 4.3.4
array(4) { [0]=> string(0) "" [1]=> string(1) "�" [2]=> string(1) "�" [3]=> string(0) "" }