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<?php
 
$s = "SW1A 1AA";
preg_match_all('~[a-zA-Z]+|\d+|[^\da-zA-Z]+~', $s, $chunks);
print_r($chunks[0]);

Success #stdin #stdout 0.01s 82944KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => SW
    [1] => 1
    [2] => A
    [3] =>  
    [4] => 1
    [5] => AA
)

https://ideone.com/7T3ABZ

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PHP (php 7.3.5)

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