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@ 2020-11-15T17:51:36Z

<?php

$code = 'A67\M';
$code = preg_replace('/[^A-Za-z0-9]+/', '', $code );
echo $code;

Output
Performance
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References
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preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

28.61 ms | 404 KiB | 5 Q