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  1. <?php
  2. preg_match_all('/[dog]+((?![\w,]))/', 'dog god ogd, dogs o', $arr, PREG_PATTERN_ORDER);
  3.  
  4. print_r($arr);
  5. ?>
Success #stdin #stdout 0.02s 13112KB
stdin
Standard input is empty
stdout
Array
(
    [0] => Array
        (
            [0] => dog
            [1] => god
            [2] => o
        )

    [1] => Array
        (
            [0] => 
            [1] => 
            [2] => 
        )

)