PathProcessorTest.php

<?php

namespace Drupal\forum_url_alter_test;

use Drupal\Core\PathProcessor\InboundPathProcessorInterface;
use Drupal\Core\PathProcessor\OutboundPathProcessorInterface;
use Drupal\Core\Render\BubbleableMetadata;
use Symfony\Component\HttpFoundation\Request;

/**
 * Path processor for url_alter_test.
 */
class PathProcessorTest implements InboundPathProcessorInterface, OutboundPathProcessorInterface {
    
    /**
     * {@inheritdoc}
     */
    public function processInbound($path, Request $request) {
        // Rewrite community/ to forum/.
        return preg_replace('@^/community(.*)@', '/forum$1', $path);
    }
    
    /**
     * {@inheritdoc}
     */
    public function processOutbound($path, &$options = [], Request $request = NULL, BubbleableMetadata $bubbleable_metadata = NULL) {
        // Rewrite forum/ to community/.
        return preg_replace('@^/forum(.*)@', '/community$1', $path);
    }

}