edlp_d8/web/modules/custom/edlp_admin/src/Plugin/Filter/CssFilter.php

<?php

namespace Drupal\edlp_admin\Plugin\Filter;

use Drupal\Component\Utility\Html;
// use Drupal\Component\Utility\Unicode;
// use Drupal\Component\Utility\Xss;
use Drupal\filter\FilterProcessResult;
use Drupal\filter\Plugin\FilterBase;
// use Drupal\Core\Url;
// use Drupal\Core\Template\Attribute;

/**
 * Provides a filter to convert audio links.
 *
 * @Filter(
 *   id = "css",
 *   title = @Translation("Css remove filter"),
 *   description = @Translation("Remove all style attributes"),
 *   type = Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_REVERSIBLE
 * )
 */
class CssFilter extends FilterBase {

  /**
   * {@inheritdoc}
   */
  public function process($text, $langcode) {
    $result = new FilterProcessResult($text);

    $cleaned_text = preg_replace('/style="[^"]*"/i', '', $text);

    $result->setProcessedText($cleaned_text);
    return $result;
  }
}