How to Get Quote Id by Masked id Magento 2.

Retrieve Quote id from the masked hash string of the guest quote in Magento 2 to fetch quote object.

masked_id is stored in the quote_id_mask table and it’s the cart hash for the guest customer. When you add a guest item to the cart, one entry generated in the quote_id_mask table to prevent quote id and masked id of the quote.

You can retrieve quote id by using interface,
Magento\Quote\Model\MaskedQuoteIdToQuoteIdInterface

<?php
namespace Jesadiya\Quote\Model;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Quote\Model\MaskedQuoteIdToQuoteIdInterface;

class Data
{
    /**
     * @var MaskedQuoteIdToQuoteIdInterface
     */
    private $maskedQuoteIdToQuoteId;

    public function __construct(
        MaskedQuoteIdToQuoteIdInterface $maskedQuoteIdToQuoteId
    ) {
        $this->maskedQuoteIdToQuoteId = $maskedQuoteIdToQuoteId;
    }

    /**
     * get QuoteId by masked id.
     *
     * @return int
     * @throws LocalizedException
     */
    public function getQuoteIdFromMaskedHash()
    {
        $maskedHashId = 'oRmLRgab2gka0drj51lCI3tAcfL2fOvI';
        try {
            $cartId = $this->maskedQuoteIdToQuoteId->execute($maskedHashId);
        } catch (NoSuchEntityException $exception) {
            throw new LocalizedException(
                __('Could not find a cart with ID "%masked_cart_id"', ['masked_cart_id' => $maskedHashId])
            );
        }

        return $cartId;
    }
}

Call from the template or PHP class,
echo $quoteId = $this->getQuoteIdFromMaskedHash();

Output: (int) value
3