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@ 2017-07-17T02:49:23Z

<?php

echo preg_replace_callback('/\d+/', function($match){
    $match[0] = intval($match[0]);
    if ($match[0]<100) {
        return sprintf("%'.03d", $match[0]);
    } else {
        return $match[1];
    }
}, 'H_000100');

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
sprintf: documentation ( source)

preferences:dark modelive preview

51.16 ms | 402 KiB | 5 Q