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@ 2022-05-29T08:25:55Z

<?php

$strings = [
    "999TB2",
    "9999XX"
];

$re = '/^(?|(\d{3})([A-Z]{2})(\d)|(\d{2})(\d{2})([A-Z]{2}))$/';

foreach ($strings as $str) {
    echo preg_replace($re, '$1-$2-$3', $str) . PHP_EOL;
}

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

31.12 ms | 404 KiB | 5 Q