Extract information from a room
     
    
    Usage
    extract_something_from_room(room, room_name, pattern, what = "wall")
 
     
    
    Arguments
- room
 
a list that should represent a room.
 
- room_name
 
a character giving the room name.
 
- pattern
 
the pattern that will be used to extract information.
 
- what
 
a character indicating what should be extracted. default to "wall".
 
 
    
    Value
    a data.frame of informations extracted.