Deprecated Functionality: preg_replace() with PHP8.1

[sandipansaha]

We are getting the following error and can see that the code is still the same.

Exception: Deprecated Functionality: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /app/pjs6hecc2k6im/vendor/breadfinance/module-breadcheckout/Helper/Quote.php on line 271 in /app/pjs6hecc2k6im/vendor/magento/framework/App/ErrorHandler.php:61

Also, "preg_replace" is being used in other several places of the module.