Password Protect Google Form Using Regular Expression

Along with Documents, Presentations, Spreadsheets and Drawings Google Drive allow us to create and share free online forms which can be used for feedback, contact, survey, etc. When you create and publish a form using Google Drive the form can access by anyone who have the link to form. If you want to restrict the Google Drive form to a selected peoples, by default, there is no option to password protect or any other ways to restrict users.