Observer to strip <p> tags for Magento 2 in pages and static blocks

ElephantData.php

<?php

namespace Elephant\CFParent\Helper;

class ElephantData extends \Magento\Framework\App\Helper\AbstractHelper
{

	public function __construct( 
    	\Magento\Framework\App\Helper\Context $context,
    	array $data = []
    ) {

    	/**
    	 * Data for further use in the widgets is collected here and can be instanced by injecting it in the child widget
    	 * Example: \Elephant\CFParent\Helper\ElephantData $elephantData
    	 **/

        parent::__construct( $context, $data );
    }

    public function processContent($content)
	{
	    // Remove wrapping paragraphs around widgets:
	    $content = preg_replace('/\<p\>{{(.*?)}}\<\/p\>/', '{{$1}}', $content);
	 
	    // Remove div around widgets
	    $content = preg_replace('/\<div\>{{(.*?)}}\<\/div\>/', '{{$1}}', $content);
	 
	    // Remove empty paragraphs:
	    $content = preg_replace('/<p>(|\s*|&nbsp;|\n)<\/p>/', '', $content);
	 
	    return $content;
	}
}

events.xml

<?xml version="1.0" encoding="UTF-8"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="cms_page_render">
        <observer name="elephant_cfparent_controller_cms_page_render" instance="Elephant\CFParent\Model\ObserverPage" />
    </event>
    <event name="cms_block_load_after">
        <observer name="elephant_cfparent_controller_cms_block_load_after" instance="Elephant\CFParent\Model\ObserverBlock" />
    </event>
</config>

ObserverBlock.php

<?php

namespace Elephant\CFParent\Model;

use Magento\Framework\Event\ObserverInterface;
use Magento\Cms\Model\Block;

class ObserverBlock implements ObserverInterface {

    /**
     * @param Item $item
     */
    public function __construct(
        \Elephant\CFParent\Helper\ElephantData $elephantData
    ) {
        $this->_elephantData = $elephantData;
    }

    /**
     * @override
     * @see ObserverInterface::execute()
     * @used-by \Magento\Framework\Event\Invoker\InvokerDefault::_callObserverMethod()
     * @see \Magento\Framework\App\Action\Action::dispatch()
     */
    public function execute(\Magento\Framework\Event\Observer $observer) {
        /** @var Block $block */
        $block = $observer->getObject();
        $content = $block->getContent();
        $content = $this->helper->removeWrappingParagraphs($content);
        $block->setContent($content);
    }
}

ObserverPage.php

<?php

namespace Elephant\CFParent\Model;

use Magento\Framework\Event\ObserverInterface;

class ObserverPage implements ObserverInterface {

    /**
     * @param Item $item
     */
    public function __construct(
        \Elephant\CFParent\Helper\ElephantData $elephantData
    ) {
        $this->_elephantData = $elephantData;
    }

    /**
     * @override
     * @see ObserverInterface::execute()
     * @used-by \Magento\Framework\Event\Invoker\InvokerDefault::_callObserverMethod()
     * @see \Magento\Framework\App\Action\Action::dispatch()
     */
    public function execute(\Magento\Framework\Event\Observer $observer) {

        $page       = $observer->getPage();
        $content    = $page->getContent();
        $content    = $this->_elephantData->processContent( $content );

        $page->setContent($content);

    }
}

Solved the problem of having a widget in a block for me Giel, thanks. ObserverBlock.php line 29 should read $this->_elephantData->processContent( $content ); though. Thanks man!

What can we do for graphql data, there also same data will be sent how to remove their and one more scenario is what if multiple widgets are there