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@ 2014-04-02T08:34:22Z

<?php
$msg = "abcde12321312";
echo preg_replace_callback("/[a-z]+/",function($m){
    return $m;
},$msg);

Output
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References
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preg_replace_callback: documentation ( source)

preferences:dark modelive preview

65.26 ms | 402 KiB | 5 Q