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@ 2020-02-16T20:47:46Z

<?php

$names = array('joe123456',
               'joe123',
               '1joe1234',
               '123joe456');

foreach ($names as $name) {
    $new_name = preg_replace('/\d/', '', $name);
    if (strlen($new_name) <= strlen($name) - 6) {
        $name = $new_name;
    }
    echo "$name\n";
}

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

33.24 ms | 405 KiB | 5 Q