Replace variables {{ group.key }} in $content to values from $rep[group][key] array. Requires PHP 5.3

Twig syntax simplified replace

        /* replace variables {{ group.key }} in $content to values from $rep[group][key] array */

        $parsed = preg_replace_callback('/{{.([a-z]+\.[a-z]+).}}/i',
        function($v) use ($rep) {
            $match = $v[0];
            $match = str_replace(' ', '', $match);
            $match = str_replace('{', '', $match);
            $match = str_replace('}', '', $match);
            list($group, $key) = explode('.', $match);
            return isset($rep[$group][$key]) ? $rep[$group][$key] : $v[0] ;
        },
        $content);