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

Success #stdin #stdout 0.03s 24176KB

stdin

Standard input is empty

stdout

Array
(
    [0] => a
    [1] => -1 90 b
    [2] => 55 0 -4 4 c
    [3] => 9
)

https://ideone.com/7vF45z

language:

PHP (php 7.3.5)

created:

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