Normalizer.php

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<?php
namespace Magento\Framework\Data\Wysiwyg;

class Normalizer
{

    const WYSIWYG_RESERVED_CHARACTERS_REPLACEMENT_MAP = [
        '{' => '^[',
        '}' => '^]',
        '"' => '`',
        '\\' => '|',
    ];

    public function replaceReservedCharacters($content)
    {
        return str_replace(
            array_keys(Normalizer::WYSIWYG_RESERVED_CHARACTERS_REPLACEMENT_MAP),
            array_values(Normalizer::WYSIWYG_RESERVED_CHARACTERS_REPLACEMENT_MAP),
            $content
        );
    }

    public function restoreReservedCharacters($content)
    {
        return str_replace(
            array_values(Normalizer::WYSIWYG_RESERVED_CHARACTERS_REPLACEMENT_MAP),
            array_keys(Normalizer::WYSIWYG_RESERVED_CHARACTERS_REPLACEMENT_MAP),
            $content
        );
    }
}