python - Replace multiline text in file using regex on Linux -

i need replace multiline text in config file. can use sed (busybox v1.21.1), perl (revision 5 version 14 subversion 2) or python (2.7).

the file can have 2 formats: a)

     "is_managed": false,       "local_profile_id": 15191724,       "name": "first user"     },     **"session": {       "restore_on_startup": 4,       "restore_on_startup_migrated": true,       "urls_to_restore_on_startup": [ "http://alamakota/" ]     }** } 

or b)

      "is_managed": false,       "local_profile_id": 15191724,       "name": "first user"    },    **"session": {       "restore_on_startup_migrated": true,    }** } 

i want change this:

     "is_managed": false,       "local_profile_id": 15191724,       "name": "first user"    },    "session": {       "restore_on_startup": 4,       "restore_on_startup_migrated": true,       "urls_to_restore_on_startup": [ "http://192.168.0.100" ]    } } 

may want parse json first , encode json if needed

use json::xs;  $rh_data = decode_json($json_string);  #then updated values accesing $rh_data->{xx}{yy} = 'new value';  #and encode json $json_data  = encode_json($rh_data);