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@ 2016-02-04T15:06:26Z

<?php

$string = 'foo_3456';
echo preg_replace('/[a-z]+_(\d+)/i', '${1}', $string);

Output
Performance
VLD
References
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preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

28.76 ms | 404 KiB | 5 Q