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@ 2020-01-29T07:23:21Z

<?php

$str = 'KX02AB1234';
$str = preg_replace('/(?<=[a-z])(?=\d)|(?<=\d)(?=[a-z])/i', '-', $str);
echo $str;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

36.73 ms | 404 KiB | 5 Q