protected function replaceRelativePaths($from, $to, $content)
{
$relative = Tools::getRelativePath(dirname($from), dirname($to)) . '/';
$content = preg_replace('/@import \'(?!.*:\\/\\/)([^\\/].*)\'/', '@import \'' . $relative . '$1\'', $content);
$content = preg_replace('/@import "(?!.*:\\/\\/)([^\\/].*)"/', '@import "' . $relative . '$1"', $content);
$content = preg_replace('/url\\(\'(?!.*:\\/\\/)([^\\/][^\\)]*)\'\\)/', 'url(\'' . $relative . '$1\')', $content);
$content = preg_replace('/url\\(\\"(?!.*:\\/\\/)([^\\/][^\\)]*)\\"\\)/', 'url(\\"' . $relative . '$1\\")', $content);
$content = preg_replace('/url\\((?!.*data:image)(?!.*:\\/\\/)([^\\/\'].*)\\)/', 'url(' . $relative . '$1)', $content);
return $content;
}