[PHP] pcre little problem

[QI.VOLMAR QI]

i have this part of code that works with DOMDocument:

public function translateNFeXML(NFE $nfe_factory) {
        $inf_adic = $nfe_factory->createElement('infAdic');
        if ($this->inf_ad_fisco) {
            $inf_adic_fisco =
$nfe_factory->createElement('infAdicFisco', $this->inf_ad_fisco);
            $inf_adic->appendChild($inf_adic_fisco);
        }

        $string = "a=10&b[]=20&c=30n°&d=40+:50";
        die(preg_filter('/[^:][[:punct:]]/', '', $string));
        $inf_cpl = $nfe_factory->createElement('infCpl',
$this->inf_complementar);

QUESTION: Why the preg_filter causes a end of the application, with no
error throwing (even in die don't appears nothing)?

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