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@ 2022-08-15T04:41:12Z

<?php

$examples = [
    'Sep 04-08',
    'Sep 29-Oct 01',
];

$result = [];
foreach ($examples as $example) {
    var_export(
        explode('-', preg_replace('/^(\D{4})\d{2}-\K(?=\d)/', '$1', $example))
    );
    echo "\n";
}

Output
Performance
VLD
References
Branches

var_export: documentation ( source)
explode: documentation ( source)

preferences:dark modelive previewkey bindings

103.02 ms | 1268 KiB | 5 Q