RemoveTags.php

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<?php
namespace Magento\Framework\Filter;

class RemoveTags implements \Zend_Filter_Interface
{
    protected function _convertEntities($matches)
    {
        return htmlentities($matches[0]);
    }

    public function filter($value)
    {
        $value = preg_replace_callback(
            "# <(?![/a-z]) | (?<=\s)>(?![a-z]) #xi",
            [$this, '_convertEntities'],
            $value
        );
        $value = htmlspecialchars_decode($value);
        
        return strip_tags($value);
    }
}