I can't find either of these verbs in this form in any source, yet they are given as options for 'rewatch'. Although mater (already listed as 'very familiar' in Larousse and as 'argot' by the Academie-Française) and regarder are listed, neither shows up anywhere in 're' form ? Is this just slang - adding re- to any base verb as needed ?
Can you explain their origin and why they would be acceptable here ?