DesignExceptions.php

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<?php
namespace Magento\Framework\View;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Serialize\Serializer\Json;

class DesignExceptions
{
    protected $scopeConfig;

    protected $exceptionConfigPath;

    protected $scopeType;

    private $serializer;

    public function __construct(
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        $exceptionConfigPath,
        $scopeType,
        Json $serializer = null
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->exceptionConfigPath = $exceptionConfigPath;
        $this->scopeType = $scopeType;
        $this->serializer = $serializer ?: ObjectManager::getInstance()->get(Json::class);
    }

    public function getThemeByRequest(\Magento\Framework\App\Request\Http $request)
    {
        $userAgent = $request->getServer('HTTP_USER_AGENT');
        if (empty($userAgent)) {
            return false;
        }
        $expressions = $this->scopeConfig->getValue(
            $this->exceptionConfigPath,
            $this->scopeType
        );
        if (!$expressions) {
            return false;
        }
        $expressions = $this->serializer->unserialize($expressions);
        foreach ($expressions as $rule) {
            if (preg_match($rule['regexp'], $userAgent)) {
                return $rule['value'];
            }
        }
        return false;
    }
}