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How can I programmatically substitute a string on Drupal Development Service entrance web page?

I create a customized module which replaces some string on Drupal Development Service entrance web page. For nodes, it work accurately, however it would not work on Drupal Development Service entrance web page. I wrote this code.

perform my_module_preprocess_page(&$variables) {   if (Drupal::routeMatch()->getRouteName() == 'view.frontpage.page_1') {     $generateBlock = NULL;     $block_manager = Drupal::service('plugin.supervisor.block');     $block_config = [];     $block_plugin = $block_manager->createInstance('id_block', $block_config);     $block_build = $block_plugin->construct();     $block_content = render($block_build);            $block = Drupalblock_contentEntityBlockContent::load(4);     $render = Drupal::entityTypeManager()->getViewBuilder('block_content')->view($block);     $physique = $render['body'][0]['#text'];     $newContent = str_replace('---*block*---', $block_content, $physique);     // I do not understand how render Drupal Development Service new modified content material from $newContent.     return $variables;   } }

I would like modify Drupal Development Service content material with a brand new string in $newContent, however I can not save this content material to variables. My content material will not be modified.

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How can I programmatically substitute a string on Drupal Development Service entrance web page?

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