---input---
a "abc\x123\n\"de//f"

---tokens---
'a'           Name.Function
' '           Text.Whitespace
'"'           Literal.String
'abc'         Literal.String
'\\x12'       Literal.String.Escape
'3'           Literal.String
'\\n'         Literal.String.Escape
'\\"'         Literal.String.Escape
'de//f'       Literal.String
'"'           Literal.String
'\n'          Text