---input---
@"ant\fbee\rcougar"

---tokens---
'@"'          Literal.String
'ant'         Literal.String
'\\f'         Literal.String.Escape
'bee'         Literal.String
'\\r'         Literal.String.Escape
'cougar'      Literal.String
'"'           Literal.String
'\n'          Text.Whitespace