Como inserir a string de caracteres com citações em r

#No Quotes in String
"hi!" #Wrap with dbl quotes

#Single Quotes in String
"I'd say hi!" # Wrap with dbl quotes

#Dbl Quotes in String
'I said "hi!"' #Wrap with single quotes

#Dbl & Single Quotes in String
"I'd say \"hi!\"" #Wrap with double quotes and use escape seq
Successful Salmon