3v4l.org

run code in 300+ PHP versions simultaneously
<?php $msg = "1a12v21s1fsd4"; $txt = "/(1[a-z]+1)/"; $res = preg_replace_callback($txt,function($m){ print_r($m); //return $m; },$msg); echo $res;

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36.77 ms | 402 KiB | 5 Q