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<?php $array = array('Dogs/Cats', 'Dogs/Cats/Mice', 'ANIMALS/SPECIES Dogs/Cats/Mice', '(Animals/Species) Dogs/Cats/Mice'); $re = '~(?:^(?:\(\w+/\w+\)\h+|[A-Z]+/[A-Z]+\h+)?|\G(?!^))\w+\K/~'; $array = preg_replace($re, " or ", $array); print_r($array);
Output for 7.1.25 - 7.1.30, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Array ( [0] => Dogs or Cats [1] => Dogs or Cats or Mice [2] => ANIMALS/SPECIES Dogs or Cats or Mice [3] => (Animals/Species) Dogs or Cats or Mice )

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108 ms | 1457 KiB | 4 Q