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@ 2014-02-14T16:02:14Z

<?php
$str='R';
var_dump($str);
$a = preg_replace('/[^;\sa-zA-Z0-9áéíóúñÁÉÍÓÚÑ]+/u', '', $str);
var_dump($a);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

38.4 ms | 402 KiB | 5 Q