TranslitUrl.php

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<?php
namespace Magento\Framework\Filter;

class TranslitUrl extends Translit
{
    public function filter($string)
    {
        $string = preg_replace('#[^0-9a-z]+#i', '-', parent::filter($string));
        $string = strtolower($string);
        $string = trim($string, '-');

        return $string;
    }
}