revert function for to_json ?

[Marc Mamin <M.Mamin@xxxxxxxxxxxx>]

Hello,

 

I'm looking for $subject

 

example:

 

how to revert

  select to_json(E'a\n''b'::text)

 

I can achieve it with something like this:

  select json_extract_path_text(('{"a":'||to_json(E'a\n''b'::text)||'}')::json,'a')

 

does anybody knows a  less ugly solution ?

 

regards,

 

Marc Mamin