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compilePattern example

    public static function compile(Route $route): CompiledRoute
    {
        $hostVariables = [];
        $variables = [];
        $hostRegex = null;
        $hostTokens = [];

        if ('' !== $host = $route->getHost()) {
            $result = self::compilePattern($route, $host, true);

            $hostVariables = $result['variables'];
            $variables = $hostVariables;

            $hostTokens = $result['tokens'];
            $hostRegex = $result['regex'];
        }

        $locale = $route->getDefault('_locale');
        if (null !== $locale && null !== $route->getDefault('_canonical_route') && preg_quote($locale) === $route->getRequirement('_locale')) {
            $requirements = $route->getRequirements();