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@ 2014-04-02T08:40:56Z

<?php
$msg = "1a12v21s1fs4d4";
$txt = "/(1[a-z]+1)(4[a-z]4)/";
$res = preg_replace_callback($txt,function($m){
    print_r($m);
    //return $m;
},$msg);
echo $res;

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

42.82 ms | 402 KiB | 5 Q