ManaPHP\Mvc\Router\Route::_extractNamedParams PHP Method

    protected function _extractNamedParams($pattern)
    {
        if (!Text::contains($pattern, '{')) {
            return $pattern;
        }
        $left_token = '@_@';
        $right_token = '!_!';
        $need_restore_token = false;
        if (preg_match('#{\\d#', $pattern) === 1 && !Text::contains($pattern, $left_token) && !Text::contains($pattern, $right_token)) {
            $need_restore_token = true;
            $pattern = preg_replace('#{(\\d+,?\\d*)}#', $left_token . '\\1' . $right_token, $pattern);
        }
        $matches = [];
        if (preg_match_all('#{([A-Z].*)}#Ui', $pattern, $matches, PREG_SET_ORDER) > 0) {
            foreach ($matches as $match) {
                if (!Text::contains($match[0], ':')) {
                    $to = '(?<' . $match[1] . '>[\\w-]+)';
                    $pattern = str_replace($match[0], $to, $pattern);
                } else {
                    $parts = explode(':', $match[1]);
                    $to = '(?<' . $parts[0] . '>' . $parts[1] . ')';
                    $pattern = str_replace($match[0], $to, $pattern);
                }
            }
        }
        if ($need_restore_token) {
            $from = [$left_token, $right_token];
            $to = ['{', '}'];
            $pattern = str_replace($from, $to, $pattern);
        }
        return $pattern;
    }