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<?php $str="#16 - Alexander Stankov | angriber | [da]"; var_dump(preg_split("/(\[\w+\])/",$str,null,PREG_SPLIT_DELIM_CAPTURE));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(37) "#16 - Alexander Stankov | angriber | " [1]=> string(4) "[da]" [2]=> string(0) "" }