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@ 2014-04-02T08:36:09Z

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

Output
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References
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preg_replace_callback: documentation ( source)

preferences:dark modelive preview

38.78 ms | 402 KiB | 5 Q