keyfilter.inc

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<?php

class KeyFilter extends FilterIterator
{
    private $regex;

    function __construct(Iterator $it, $regex)
    {
        parent::__construct($it);
        $this->regex = $regex;
    }

    function accept()
    {
        return ereg($this->regex, $this->getInnerIterator()->key());
    }
    
    function getRegex()
    {
        return $this->regex;
    }

    protected function __clone()
    {
        // disallow clone 
    }
}

?>