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<?php
 
$str = 'a-1 90 b55 0 -4 4 c9';
$array = preg_split('#(?=[abc])#',$str, -1, PREG_SPLIT_NO_EMPTY);
print_r($array);

Success #stdin #stdout 0.02s 24516KB

stdin

Standard input is empty

stdout

Array
(
    [0] => a-1 90 
    [1] => b55 0 -4 4 
    [2] => c9
)

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